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Zhao Y, Zhang M, Alabastri A, Nordlander P. Fast Topology Optimization for Near-Field Focusing All-Dielectric Metasurfaces Using the Discrete Dipole Approximation. ACS Nano 2022; 16:18951-18958. [PMID: 36314904 DOI: 10.1021/acsnano.2c07848] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Using an efficient implementation of the discrete dipole approximation and topology optimization, we design all-dielectric metasurfaces capable of focusing light into intense deep subwavelength hotspots. The light focusing of these metasurfaces far outweighs conventional lenses and can provide dramatic enhancements of processes that depend superlinearly on light intensity, such as light-powered membrane distillation and photocatalysis. Our approach can easily be generalized to optimize metasurfaces for other functionalities, such as nonlinear optics or photothermal conversion.
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Pang C, Li R, Dong N, Li Z, Wang J, Ren F, Chen F. Plasmonic core-shell nano-heterostructures with temperature-dependent optical nonlinearity. Nanoscale 2020; 12:22995-23002. [PMID: 33241823 DOI: 10.1039/d0nr05176d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Plasmonics in bimetallic heterostructures have emerged as powerful tools for tunable ultrafast dynamics in nonlinear optical responses. Despite numerous studies on the mechanism of nonlinearity tailoring with various influence factors, so far, a fundamental investigation of temperature-controlled nonlinearity modulation remains blank in heterostructure systems. Here, we report on the fabrication of embedded Y@Ag/AgY core-shell nanostructures (CSNs) in fused silica for tunable nonlinearity with a laser-intensity-dependent temperature switch. Localized surface plasmon resonance (LSPR) in CSNs is substantially modified, resulting in the reconstruction of near field intensity for spatial temperature manipulation. In addition, the size effect and incident intensity dependence on the temperature of CSNs reveal improved laser tolerance with laser intensity threshold increased by 5.7 times. These results provide additional strategies for photothermal-effect-controlled nonlinearity modification in bimetallic heterostructures and unlock the potential for temperature-sensitive photonic devices under extreme conditions.
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Affiliation(s)
- Chi Pang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
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Sung J, Lee GY, Choi C, Hong J, Lee B. Polarization-dependent asymmetric transmission using a bifacial metasurface. Nanoscale Horiz 2020; 5:1487-1495. [PMID: 32945326 DOI: 10.1039/d0nh00319k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
One of the most important research topic in optics and photonics is the design of metasurfaces to substitute conventional optical elements that demonstrate unprecedented merits in terms of performance and form factor. In this context, full-space control of metasurfaces that makes it possible to manipulate scattered light in transmission and reflection spaces simultaneously, is proposed as the next-generation scheme in optics, with a potential for applications such as 360° holographic images and novel optical systems. However, previously designed metasurfaces lacked functionality because the desired operation occurs under preconditioned light; therefore, they are difficult to use in real applications. Here, we present a design method that enables polarization-dependent full-space control, in which two independent and arbitrary phase profiles can be addressed to each space. Upon introducing a phase gradient value to realize the critical angle condition, conversion of transmissive into reflective operation is realized. Then, rectangular nanopillars are utilized to facilitate polarization beam splitting with the desired phase. Three samples were fabricated and measured based on the proposed scheme.
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Affiliation(s)
- Jangwoon Sung
- All authors are with School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanakro 1, Gwanak-Gu, Seoul 08826, Republic of Korea.
| | - Gun-Yeal Lee
- All authors are with School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanakro 1, Gwanak-Gu, Seoul 08826, Republic of Korea.
| | - Chulsoo Choi
- All authors are with School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanakro 1, Gwanak-Gu, Seoul 08826, Republic of Korea.
| | - Jongwoo Hong
- All authors are with School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanakro 1, Gwanak-Gu, Seoul 08826, Republic of Korea.
| | - Byoungho Lee
- All authors are with School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanakro 1, Gwanak-Gu, Seoul 08826, Republic of Korea.
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Yan J, Zheng Z, Lou Z, Li J, Mao B, Li B. Enhancement of exciton emission in WS 2 based on the Kerker effect from the mode engineering of individual Si nanostripes. Nanoscale Horiz 2020; 5:1368-1377. [PMID: 32608428 DOI: 10.1039/d0nh00189a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Coupling between nanostructures and excitons has attracted great attention for potential applications in quantum information technology. Compared with plasmonic platforms, all-dielectric nanostructures with Mie resonances are more practical because of low-loss, low-cost and CMOS compatibility. However, weak field enhancements in single element dielectric nanostructures hinder their applications in both strong and weak coupling regimes. The Kerker effect arising from the far-field electro-magnetic interactions in dielectric nanostructures brings a new mechanism to realize effective coupling with excitons. Until now, it still remains unsolved whether effective Mie-exciton coupling can be realized based on pure far-field Kerker effect. Therefore, we proposed a silicon-on-insulator (SOI) integrated Mie resonator with a 135 nm top oxide layer to exclude the near-field coupling between excitons and silicon (Si) nanostripes. Through tuning the widths of Si nanostripes to obtain highly directional photoluminescence (PL) emission under Kerker conditions, strong PL enhancements can be observed, whose enhancement factors are comparable to the reported best performances of single all-dielectric or even plasmonic nanostructures coupling with 2D excitons. Our findings bring new strategies for strong light-matter interactions with near-zero heating loss and make it possible to construct 2D materials-silicon hybrid integration for future nanophotonic and optoelectronic devices.
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Affiliation(s)
- Jiahao Yan
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China.
| | - Zhaoqiang Zheng
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
| | - Zaizhu Lou
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China.
| | - Juan Li
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China.
| | - Bijun Mao
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China.
| | - Baojun Li
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China.
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Tang F, Ye X, Li Q, Li H, Yu H, Wu W, Li B, Zheng W. Quadratic Meta-Reflectors Made of HfO 2 Nanopillars with a Large Field of View at Infrared Wavelengths. Nanomaterials (Basel) 2020; 10:nano10061148. [PMID: 32545341 PMCID: PMC7353395 DOI: 10.3390/nano10061148] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/23/2020] [Accepted: 06/04/2020] [Indexed: 01/11/2023]
Abstract
Metasurfaces, being composed of subwavelength nanostructures, can achieve peculiar optical manipulations of phase, amplitude, etc. A large field of view (FOV) is always one of the most desirable characteristics of optical systems. In this study, metasurface-based quadratic reflectors (i.e., meta-reflectors) made of HfO2 nanopillars are investigated to realize a large FOV at infrared wavelengths. First, the geometrical dependence of HfO2 nanopillars' phase difference is analyzed to show the general principles of designing infrared HfO2 metasurfaces. Then, two meta-reflectors with a quadratic phase profile are investigated to show their large FOV, subwavelength resolution, and long focal depth. Furthermore, the two quadratic reflectors also show a large FOV when deflecting a laser beam with a deflecting-angle range of approximately ±80°. This study presents a flat optical metamaterial with a large FOV for imaging and deflecting, which can greatly simplify the optical-mechanical complexity of infrared systems, particularly with potential applications in high-power optical systems.
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Affiliation(s)
- Feng Tang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Xin Ye
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
- Correspondence: (X.Y.); (W.Z.); Tel.: +86-153-9778-0786 (X.Y.); +86-183-2821-8958 (W.Z.)
| | - Qingzhi Li
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Hailiang Li
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China;
| | - Haichao Yu
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215125, Jiangsu, China;
| | - Weidong Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Bo Li
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Wanguo Zheng
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
- IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
- Correspondence: (X.Y.); (W.Z.); Tel.: +86-153-9778-0786 (X.Y.); +86-183-2821-8958 (W.Z.)
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Shang S, Tang F, Ye X, Li Q, Li H, Wu J, Wu Y, Chen J, Zhang Z, Yang Y, Zheng W. High-Efficiency Metasurfaces with 2π Phase Control Based on Aperiodic Dielectric Nanoarrays. Nanomaterials (Basel) 2020; 10:nano10020250. [PMID: 32023807 PMCID: PMC7075171 DOI: 10.3390/nano10020250] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/23/2020] [Accepted: 01/27/2020] [Indexed: 11/16/2022]
Abstract
In this study, the high-efficiency phase control Si metasurfaces are investigated based on aperiodic nanoarrays unlike widely-used period structures, the aperiodicity of which providing additional freedom to improve metasurfaces' performance. Firstly, the phase control mechanism of Huygens nanoblocks is demonstrated, particularly the internal electromagnetic resonances and the manipulation of effective electrical/magnetic polarizabilities. Then, a group of high-transmission Si nanoblocks with 2π phase control is sought by sweeping the geometrical parameters. Finally, several metasurfaces, such as grating and parabolic lens, are numerically realized by the nanostructures with high efficiency. The conversion efficiency of the grating reaches 80%, and the focusing conversion efficiency of the metalens is 99.3%. The results show that the high-efficiency phase control metasurfaces can be realized based on aperiodic nanoarrays, i.e., additional design freedom.
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Affiliation(s)
- Sihui Shang
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; (S.S.); (Y.Y.)
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Feng Tang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Xin Ye
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Qingzhi Li
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Hailiang Li
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
- Correspondence: (H.L.); (Z.Z.); (W.Z.); Tel.: +86-1348-867-5143 (H.L.); +86-1360-817-4673(Z.Z.); +86-1539-9778-0786 (W.Z.)
| | - Jingjun Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Yiman Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Jun Chen
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
| | - Zhihong Zhang
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; (S.S.); (Y.Y.)
- Correspondence: (H.L.); (Z.Z.); (W.Z.); Tel.: +86-1348-867-5143 (H.L.); +86-1360-817-4673(Z.Z.); +86-1539-9778-0786 (W.Z.)
| | - Yuanjie Yang
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; (S.S.); (Y.Y.)
| | - Wanguo Zheng
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (X.Y.); (Q.L.); (J.W.); (Y.W.); (J.C.)
- Correspondence: (H.L.); (Z.Z.); (W.Z.); Tel.: +86-1348-867-5143 (H.L.); +86-1360-817-4673(Z.Z.); +86-1539-9778-0786 (W.Z.)
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