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He Z, Lu H, Zhao J. Polarization independent and non-reciprocal absorption in multi-layer anisotropic black phosphorus metamaterials. OPTICS EXPRESS 2021; 29:21336-21347. [PMID: 34265923 DOI: 10.1364/oe.430038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 05/31/2021] [Indexed: 06/13/2023]
Abstract
The polarization independent and non-reciprocal absorption is particularly crucial for the realization of non-reciprocal absorption devices. Herein, we proposed and studied the absorption response of two- and three-layer anisotropic black phosphorus (BP) metamaterials by using the finite-difference time-domain (FDTD) simulation and radiation oscillator theory (ROT) analysis. It is shown that, due to unequal surface plasmon resonant modes excited in zigzag (ZZ) and armchair (AC) directions of the anisotropic BP layer, tunable polarization independent and dependent absorption can be achieved for the proposed multi-layer anisotropic BP metamaterials with AC-AC, AC-ZZ, ZZ-AC, AC-AC-φ, AC-ZZ-φ, and ZZ-AC-φ configurations. Especially, the polarization independent absorption also can be realized for odd-layer BP nanostructures. Unlike previous reports, polarization independence only can be achieved in the even-layer BP nanostructure. Moreover, tunable non-reciprocal absorption with the extremely large non-reciprocal degree (NRD) is also found in the case of AC-ZZ and ZZ-AC configurations and AC-ZZ-φ and ZZ-AC-φ configurations. These results may open up the possibility of realizing tunable polarization independent and non-reciprocal plasmonic devices based on 2D materials.
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2
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He Z, Li Z, Li C, Xue W, Cui W. Ultra-high sensitivity sensing based on ultraviolet plasmonic enhancements in semiconductor triangular prism meta-antenna systems. OPTICS EXPRESS 2020; 28:17595-17610. [PMID: 32679965 DOI: 10.1364/oe.395640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 05/20/2020] [Indexed: 06/11/2023]
Abstract
Silicon (Si), germanium (Ge), and gallium arsenide (GaAs) are familiar semiconductors that always act in the role of optical dielectrics. However, these semiconductors also have plasmonic behaviors in ultraviolet (UV) ranges due to the strong interband transitions or valence electrons. And few studies are aimed at investigating plasmonic properties in the semiconductor at the nanoscale. In this work, we discuss UV plasmonics and sensing properties in single and dimer Si, Ge, and GaAs triangular prism meta-antenna systems. The results show that obvious local surface plasmon resonances (LSPRs) can be realized in the proposed triangular prism meta-antennas, and the resonant wavelength, electromagnetic field distribution, surface charge distribution, and surface current density can be effectively tuned by structural and material parameters. In addition, we also find that the Si triangular prism meta-antenna shows more intense plasmonic responses in UV ranges than that in the Ge or GaAs triangular prism nanostructures. Especially, the phase difference between the triangular prism nanostructure and light source can effectively regulate the symbol and value of the surface charge. Moreover, the great enhancement of electric field can be seen in the dimer triangular prism meta-antennas when the distance of the gap is g<5 nm, especially g=1 nm. The most interesting result is that the maximum of refractive index sensitivity s and figure of merit (FoM) are greatly enlarged in dimer triangular prism meta-antennas. Particularly, the sensitivity can reach up to 215 nm/RIU in the dimer GaAs triangular prism meta-antennas, which is improved more than one order of magnitude. These research results may play important roles in applications of the photo detecting, plasmonic sensing and disinfecting in UV ranges.
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3
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He Z, Xue W, Cui W, Li C, Li Z, Pu L, Feng J, Xiao X, Wang X, Li G. Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO 2 Hybrid Metasurface. NANOMATERIALS 2020; 10:nano10040687. [PMID: 32260584 PMCID: PMC7221975 DOI: 10.3390/nano10040687] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 11/29/2022]
Abstract
We investigate Fano resonances and sensing enhancements in a simple Au/TiO2 hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO2 structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO2 hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO2 hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO2 metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors.
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Affiliation(s)
- Zhihui He
- Correspondence: ; Tel./Fax: +86-091-1265-0504
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Gate-Tunable Plasmon-Induced Transparency Modulator Based on Stub-Resonator Waveguide with Epsilon-Near-Zero Materials. Sci Rep 2019; 9:2789. [PMID: 30808945 PMCID: PMC6391484 DOI: 10.1038/s41598-019-39047-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 01/10/2019] [Indexed: 11/08/2022] Open
Abstract
We demonstrate an electrically tunable ultracompact plasmonic modulator with large modulation strength (>10 dB) and a small footprint (~1 μm in length) via plasmon-induced transparency (PIT) configuration. The modulator based on a metal-oxide-semiconductor (MOS) slot waveguide structure consists of two stubs embedded on the same side of a bus waveguide forming a coupled system. Heavily n-doped indium tin oxide (ITO) is used as the semiconductor in the MOS waveguide. A large modulation strength is realized due to the formation of the epsilon-near-zero (ENZ) layer at the ITO-oxide interface at the wavelength of the modulated signal. Numerical simulation results reveal that such a significant modulation can be achieved with a small applied voltage of ~3V. This result shows promise in developing nanoscale modulators for next generation compact photonic/plasmonic integrated circuits.
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Song C, Wang J, Liu D, Hu ZD, Zhang F. Wavelength-sensitive PIT-like double-layer graphene-based metal-dielectric-metal waveguide. APPLIED OPTICS 2018; 57:9770-9776. [PMID: 30462009 DOI: 10.1364/ao.57.009770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 10/17/2018] [Indexed: 06/09/2023]
Abstract
A wavelength-sensitive plasmonically induced transparency-like (PIT-like) device consisting of a double-layer graphene-based metal-dielectric-metal (MDM) waveguide is proposed. We initially investigate monolayer graphene sandwiched in the MDM waveguide and utilize the phase-matching equation to explain the reflected resonant wavelength of the transmission spectra. The PIT-like windows in the transmission spectra of double-layer graphene can be achieved by tuning the applied bias voltage on the graphene layer and the distance between the graphene layer and metal substrate. We can obtain the high-performance PIT-like devices with a flexible on-off-on effect. We use a finite element method to do all related simulations.
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Li Y, Su Y, Lin Q, Zhai X, Wang LL. Active control of an edge-mode-based plasmon-induced absorption sensor. APPLIED OPTICS 2018; 57:2698-2703. [PMID: 29714262 DOI: 10.1364/ao.57.002698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
We investigate the formation and evolution of plasmon-induced absorption (PIA) effect in a three-dimensional graphene waveguide structure. The PIA window is formed by near-field coupling of the graphene edge mode, the extremely destructive interference between the radiative mode and sub-radiative mode of graphene nanoribbons. The resonance intensity has a significant dependence on the coupling distance between the graphene nanoribbons. At the same time, it is particularly sensitive to the refractive index of the environment, which is promising for sensing devices. In addition, the resonant wavelength can be actively controlled by changing the Fermi energy of graphene. Moreover, it can be seen that the group time delay of the PIA window reaches -0.28 ps, which is a good candidate for ultrafast light application. Finally, additional graphene nanoribbons can also form a double-channel PIA window. Our work may provide an excellent platform for controlling the optical transmission of highly integrated plasmonic components.
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Wang J, Wang X, Shao H, Hu ZD, Zheng G, Zhang F. Peak modulation in multicavity-coupled graphene-based waveguide system. NANOSCALE RESEARCH LETTERS 2017; 12:9. [PMID: 28058643 PMCID: PMC5216007 DOI: 10.1186/s11671-016-1791-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 12/14/2016] [Indexed: 05/29/2023]
Abstract
Plasmonically induced transparency (PIT) in a multicavity-coupled graphene-based waveguide system is investigated theoretically and numerically. By using the finite element method (FEM), the multiple mode effect can be achieved, and blue shift is exhibited by tunable altering the chemical potential of the monolayer graphene. We find that the increasing number of the graphene rectangle cavity (GRC) achieves the multiple PIT peaks. In addition, we find that the PIT peaks reduce to just one when the distance between the third cavity and the second one is 100 nm. Easily to be experimentally fabricated, this graphene-based waveguide system has many potential applications for the advancement of 3D ultra-compact, high-performance, and dynamical modulation plasmonic devices.
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Affiliation(s)
- Jicheng Wang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi, 214122, China.
- Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, 912, Beijing, 100083, China.
| | - Xiaosai Wang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi, 214122, China
| | - Hongyan Shao
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi, 214122, China
| | - Zheng-Da Hu
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi, 214122, China
| | - Gaige Zheng
- School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China
| | - Feng Zhang
- Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, 912, Beijing, 100083, China.
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Akhavan A, Ghafoorifard H, Abdolhosseini S, Habibiyan H. Plasmon-induced transparency based on a triangle cavity coupled with an ellipse-ring resonator. APPLIED OPTICS 2017; 56:9556-9563. [PMID: 29216073 DOI: 10.1364/ao.56.009556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 10/31/2017] [Indexed: 06/07/2023]
Abstract
In this paper, a novel compact plasmonic system is introduced to realize the phenomenon of plasmon-induced transparency. The proposed device consists of a triangle defect coupled with an ellipse-ring resonator based on a metal-insulator-metal platform. By the finite-difference time-domain method, the transmission characteristics are numerically studied in detail. In order to verify the simulation results, the coupled mode theory is utilized. In the following, the effect of geometrical parameters, namely, the major and minor radii of the ellipse-ring and the gap between cavities, are investigated. Moreover, the fundamental factors of transmission spectra including intrinsic Drude loss and refractive index of dielectric region are studied. As a result, the transmission peak is obtained near 70% and the full width at half-maximum is close to 28 nm. The sensitivity and figure of merit of the proposed structure are 860 nm/RIU and 31.6 RIU-1, respectively. The mentioned compact structure has the ability and potential to be used in integrated optical circuits like slow light devices, nanoscale filters and nanosensors.
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Zhao Z, Zheng X, Peng W, Zhang J, Zhao H, Luo Z, Shi W. Localized terahertz electromagnetically-induced transparency-like phenomenon in a conductively coupled trimer metamolecule. OPTICS EXPRESS 2017; 25:24410-24424. [PMID: 29041386 DOI: 10.1364/oe.25.024410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
We experimentally investigate the terahertz (THz) electromagnetically-induced transparency (EIT)-like phenomenon in a metamolecule (MM) of three-body system. This system involves a couple of geometrically identical split-ring resonators (SRRs) in orthogonal layout conductively coupled by a cut-wire resonator. Such a three-body system exhibits two frequency response properties upon to the polarization of incident THz beam: One is the dark-bright-bright layout to the horizontally polarized THz beam, where there is no EIT-like effect; the other is bright-dark-dark layout to the vertically polarized THz beam, where an EIT-like effect is observable. The transparency window can be tuned from 0.71 THz to 0.74 THz by the displacement of cut-wire inside the trimer MM. A maximum of 7.5 ps group delay of THz wave is found at the transparent window of 0.74 THz. When the cut-wire moved to the mid-point of lateral-side of SRR, the EIT-like phenomenon disappears, this leads to a localized THz slow-light effect. The distribution of surface currents and electric energy reveals that the excited inductive-capacitive (LC) oscillation of bright-SRR dominates the high frequency side-mode, which is isolated to the displacement of cut-wire resonator. However, the low frequency side-mode originates from the constructive hybridization of LC resonance in dark-SRR coupled with a localized S-shaped dipole oscillator, which is tunable by the displacement of cut-wire. As a consequence, the group delay as well as the spectral configuration of transparency window can be manipulated by tuning one side-mode while fixing the other. Such an experimental finding reveal the EIT-like effect in a conductively coupled three-body system and manifests a novel approach to achieve tunable THz slow-light device.
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10
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Zhao M, Li H, He Z, Chen Z, Xu H, Zheng M. Novel oscillator model with damping factor for plasmon induced transparency in waveguide systems. Sci Rep 2017; 7:10635. [PMID: 28878379 PMCID: PMC5587711 DOI: 10.1038/s41598-017-11335-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 08/21/2017] [Indexed: 11/22/2022] Open
Abstract
We introduce a novel two-oscillator model with damping factor to describe the plasmon induced transparency (PIT) in a bright-dark model plasmonic waveguide system. The damping factor γ in the model can be calculated from metal conductor damping factor γc and dielectric damping factor γd. We investigate the influence of geometry parameters and damping factor γ on transmission spectra as well as slow-light effects in the plasmonic waveguide system. We can find an obvious PIT phenomenon and realize a considerable slow-light effect in the double-cavities system. This work may provide guidance for optical switching and plasmon-based information processing.
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Affiliation(s)
- Mingzhuo Zhao
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China.,School of Physics and Electronic, Hunan University of Science and Technology, Xiangtan, 411201, PR China
| | - Hongjian Li
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China.
| | - Zhihui He
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China
| | - Zhiquan Chen
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China
| | - Hui Xu
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China
| | - Mingfei Zheng
- School of Physics and Electronic, Central South University, Changsha, 410083, PR China
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11
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Liu D, Wang J, Zhang F, Pan Y, Lu J, Ni X. Tunable Plasmonic Band-Pass Filter with Dual Side-Coupled Circular Ring Resonators. SENSORS 2017; 17:s17030585. [PMID: 28335398 PMCID: PMC5375871 DOI: 10.3390/s17030585] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 03/07/2017] [Accepted: 03/07/2017] [Indexed: 11/23/2022]
Abstract
A wavelength band-pass filter with asymmetric dual circular ring resonators in a metal-insulator-metal (MIM) structure is proposed and numerically simulated. For the interaction of the local discrete state and the continuous spectrum caused by the side-coupled resonators and the baffle, respectively, the transmission spectrum exhibits a sharp and asymmetric profile. By adjusting the radius and material imbedded in one ring cavity, the off-to-on plasmon-induced absorption (PIA) optical response can be tunable achieved. In addition, the structure can be easily extended to other similar compact structures to realize the filtering task. Our structures have important potential applications for filters and sensors at visible and near-infrared regions.
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Affiliation(s)
- Dongdong Liu
- School of Science, Nanjing University of Science & Technology, Nanjing 210094, China.
- School of Mathematics & Physics Science, Xuzhou University of Technology, Xuzhou 221018, China.
| | - Jicheng Wang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China.
| | - Feng Zhang
- Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
| | - Yuewu Pan
- School of Mathematics & Physics Science, Xuzhou University of Technology, Xuzhou 221018, China.
| | - Jian Lu
- School of Science, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Xiaowu Ni
- School of Science, Nanjing University of Science & Technology, Nanjing 210094, China.
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12
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He Z, Li H, Li B, Chen Z, Xu H, Zheng M. Theoretical analysis of ultrahigh figure of merit sensing in plasmonic waveguides with a multimode stub. OPTICS LETTERS 2016; 41:5206-5209. [PMID: 27842094 DOI: 10.1364/ol.41.005206] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose an expanded coupled mode theory to analyze sensing performance in a plasmonic slot waveguide side-coupled with a multimode stub resonator. It is confirmed by the finite-difference time-domain simulations. Through adjusting the parameters, we can realize figure of merit (FOM) of ∼59,010, and the sensitivity S can reach to 75.7. Compared with the plasmonic waveguide systems in recent Letters, our proposed structure has the advantages of easy fabrication, compactness, sensitivity, and high FOM. The proposed theory model and findings provide guidance for fundamental research of the integrated plasmonic nanosensor applications.
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13
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Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets. Sci Rep 2016; 6:36165. [PMID: 27824071 PMCID: PMC5099917 DOI: 10.1038/srep36165] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 10/07/2016] [Indexed: 11/08/2022] Open
Abstract
In this study, we observed the peak splitting of absorption spectra for two-dimensional sheets of silver nanoparticles due to the electromagnetically induced transparency (EIT) effect. This unique optical phenomenon was observed for the multilayered nanosheets up to 20 layers on a metal substrate, while this phenomenon was not observed on a transparent substrate. The wavelength and intensities of the split peaks depend on the number of layers, and the experimental results were well reproduced by the calculation of the Transfer-Matrix method by employing the effective medium approximation. The Ag nanosheets used in this study can act as a plasmonic metamaterial light absorber, which has a such large oscillator strength. This phenomenon is a fundamental optical property of a thin film on a metal substrate but has never been observed because native materials do not have a large oscillator strength. This new type of EIT effect using a plasmonic metamaterial light absorber presents the potential for the development of future optic and photonic technologies.
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14
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Xu H, Li H, Li B, He Z, Chen Z, Zheng M. Influential and theoretical analysis of nano-defect in the stub resonator. Sci Rep 2016; 6:30877. [PMID: 27477218 PMCID: PMC4967903 DOI: 10.1038/srep30877] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 07/11/2016] [Indexed: 11/30/2022] Open
Abstract
We investigate a classic optical effect based on plasmon induced transparency (PIT) in a metal-insulator-metal (MIM) bus waveguide coupled with a single defective cavity. With the coupled mode theory (CMT), a theoretical model, for the single defective cavity, is established to study spectral features in the plasmonic waveguide. We can achieve a required description for the phenomenon, and the theoretical results also agree well with the finite-difference time-domain (FDTD) method. Our researches show that the defect’s position and size play important roles in the PIT phenomenon. By adjusting the position and size of the defect, we can realize the PIT phenomenon well and get the required slow light effect. The proposed model and findings may provide guidance for fundamental research of the control of light in highly integrated optical circuits.
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Affiliation(s)
- Hui Xu
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
| | - Hongjian Li
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
| | - Boxun Li
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
| | - Zhihui He
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
| | - Zhiquan Chen
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
| | - Mingfei Zheng
- College of Physics and Electronics, Central South University, Changsha 410083, PR China
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15
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Chen Z, Li H, Zhan S, Li B, He Z, Xu H, Zheng M. Tunable high quality factor in two multimode plasmonic stubs waveguide. Sci Rep 2016; 6:24446. [PMID: 27075935 PMCID: PMC4830990 DOI: 10.1038/srep24446] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 03/30/2016] [Indexed: 11/09/2022] Open
Abstract
We numerically investigate the optical characteristics of a metal-dielectric-metal (MDM) waveguide side-coupled with two identical multimode stub resonators. Double plasmon-induced transparency (PIT) peaks with narrow full width at half maximum (FWHM) and high quality factor (Q-factor) can be observed in this structure. The Q-factors of PIT peaks in two stub resonators system are larger than those in single stub resonator system. A multimode coupled-radiation oscillator theory (MC-ROT), which is derived from ROT, is proposed to analyze the spectral response in the multimode system for the first time. The analytical results are confirmed by the finite-difference time-domain (FDTD) simulation results. We can also find that the Q-factors of the two PIT peaks have an opposite evolution tendency with the change of the stubs parameters and the maximum can reach to 427. These results may provide some applications for ultrasensitive sensors, switches and efficient filters.
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Affiliation(s)
- Zhiquan Chen
- College of Physics and Electronic, Central South University, Changsha 410083, China.,College of Communication and Electronic Engineering, Hunan City University, Yiyang 413000, China
| | - Hongjian Li
- College of Physics and Electronic, Central South University, Changsha 410083, China
| | - Shiping Zhan
- College of Physics and Electronic, Central South University, Changsha 410083, China
| | - Boxun Li
- College of Physics and Electronic, Central South University, Changsha 410083, China
| | - Zhihui He
- College of Physics and Electronic, Central South University, Changsha 410083, China
| | - Hui Xu
- College of Physics and Electronic, Central South University, Changsha 410083, China
| | - Mingfei Zheng
- College of Physics and Electronic, Central South University, Changsha 410083, China
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16
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Yang H, Li G, Su X, Zhao W, Zhao Z, Chen X, Lu W. A novel transmission model for plasmon-induced transparency in plasmonic waveguide system with a single resonator. RSC Adv 2016. [DOI: 10.1039/c6ra07562b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A novel transmission model with two branches is proposed to investigate the plasmon-induced transparency in a plasmonic waveguide system.
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Affiliation(s)
- Hui Yang
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Guanhai Li
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Xiaofang Su
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Wenchao Zhao
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Zengyue Zhao
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Xiaoshuang Chen
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
| | - Wei Lu
- National Laboratory for Infrared Physics
- Shanghai Institute of Technical Physics
- Chinese Academy of Sciences
- Shanghai
- P. R. China
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17
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Han X, Wang T, Li X, Xiao S, Zhu Y. Dynamically tunable plasmon induced transparency in a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators structure on sapphire substrate. OPTICS EXPRESS 2015; 23:31945-55. [PMID: 26698986 DOI: 10.1364/oe.23.031945] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this paper, we propose dynamically tunable plasmon induced transparency (PIT) in a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators structure on sapphire substrate by shifting the Fermi energy level of the graphene. Two different methods are employed to obtain the PIT effect: one is based on the direct destructive interference between a radiative state and a dark state, the other is based on the indirect coupling through a graphene nanoribbon waveguide. Our numerical results reveal that high tunability in the PIT transparency window can be obtained by altering the Fermi energy levels of the graphene rectangular resonators. Moreover, double PITs are also numerically predicted in this ultracompact structure, comprising series of graphene rectangular resonators. Compared with previously proposed graphene-based PIT effects, our proposed scheme is much easier to design and fabricate. This work not only paves a new way towards the realization of graphene-based integrated nanophotonic devices, but also has important applications in multi-channel-selective filters, sensors, and slow light.
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18
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He Z, Li H, Zhan S, Li B, Chen Z, Xu H. Tunable Multi-switching in Plasmonic Waveguide with Kerr Nonlinear Resonator. Sci Rep 2015; 5:15837. [PMID: 26510949 PMCID: PMC4625373 DOI: 10.1038/srep15837] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 10/01/2015] [Indexed: 11/09/2022] Open
Abstract
We propose a nanoplasmonic waveguide side-coupled with bright-dark-dark resonators in our paper. A multi-oscillator theory derived from the typical two-oscillator model, is established to describe spectral features as well as slow-light effects in bright-dark-dark structures, and confirmed by the finite-difference time domain (FDTD). That a typical plasmon induced transparency (PIT) turns to double PIT spectra is observed in this waveguide structure. At the same time, multi-switching effects with obvious double slow-light bands based on double PIT are also discovered in our proposed structure. What's more, dynamically tuning the multi-switching is achieved by means of filling Fabry-Perot resonators with the Kerr nonlinear material Ag-BaO. These results may have applications in all-optical devices, moreover, the multi-oscillator theory may play a guiding role in designing plasmonic devices.
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Affiliation(s)
- Zhihui He
- College of Physics and Electronics, Central South University, Changsha 410083, China
| | - Hongjian Li
- College of Physics and Electronics, Central South University, Changsha 410083, China.,College of Materials Science and Engineering, Central South University, Changsha 410083, PR China
| | - Shiping Zhan
- College of Physics and Electronics, Central South University, Changsha 410083, China
| | - Boxun Li
- College of Physics and Electronics, Central South University, Changsha 410083, China
| | - Zhiquan Chen
- College of Physics and Electronics, Central South University, Changsha 410083, China
| | - Hui Xu
- College of Physics and Electronics, Central South University, Changsha 410083, China
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Zhan S, Li H, He Z, Li B, Chen Z, Xu H. Sensing analysis based on plasmon induced transparency in nanocavity-coupled waveguide. OPTICS EXPRESS 2015; 23:20313-20320. [PMID: 26367886 DOI: 10.1364/oe.23.020313] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the sensing characteristic based on plasmon induced transparency in nanocavity-coupled metal-dielectric-metal waveguide analytically and numerically. A simple model for the sensing nature is first presented by the coupled mode theory. We show that the coupling strength and the resonance detuning play important roles in optimizing the sensing performance and the detection limit of sensor, and an interesting double-peak sensing is also obtained in such plasmonic sensor. In addition, the specific refractive index width of the dielectric environment is discovered in slow-light sensing and the relevant sensitivity can be enhanced. The proposed model and findings provide guidance for fundamental research of the integrated plasmonic nanosensor applications and designs.
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