1
|
Gopalan P, Wang Y, Sensale-Rodriguez B. Terahertz characterization of two-dimensional low-conductive layers enabled by metal gratings. Sci Rep 2021; 11:2833. [PMID: 33531627 PMCID: PMC7854586 DOI: 10.1038/s41598-021-82560-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 01/14/2021] [Indexed: 12/02/2022] Open
Abstract
While terahertz spectroscopy can provide valuable information regarding the charge transport properties in semiconductors, its application for the characterization of low-conductive two-dimensional layers, i.e., σs < < 1 mS, remains elusive. This is primarily due to the low sensitivity of direct transmission measurements to such small sheet conductivity levels. In this work, we discuss harnessing the extraordinary optical transmission through gratings consisting of metallic stripes to characterize such low-conductive two-dimensional layers. We analyze the geometric tradeoffs in these structures and provide physical insights, ultimately leading to general design guidelines for experiments enabling non-contact, non-destructive, highly sensitive characterization of such layers.
Collapse
Affiliation(s)
- Prashanth Gopalan
- Department of Electrical and Computer Engineering, The University of Utah, Salt Lake City, UT, 84112, USA
| | - Yunshan Wang
- Department of Chemical Engineering, The University of Utah, Salt Lake City, UT, 84112, USA
| | - Berardi Sensale-Rodriguez
- Department of Electrical and Computer Engineering, The University of Utah, Salt Lake City, UT, 84112, USA.
| |
Collapse
|
2
|
Tang M, Xia L, Wei D, Yan S, Zhang M, Yang Z, Wang H, Du C, Cui HL. Rapid and label-free metamaterial-based biosensor for fatty acid detection with terahertz time-domain spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2020; 228:117736. [PMID: 31753643 DOI: 10.1016/j.saa.2019.117736] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 10/22/2019] [Accepted: 10/30/2019] [Indexed: 06/10/2023]
Abstract
A rapid method for detecting fatty acids (FAs) using terahertz time-domain spectroscopy (THz-TDS) technology combined with a metamaterial-based THz sensor was developed. We measured the THz responses to oleic acid, linoleic acid and α-linoleic acid with different numbers of double-bond, α-linoleic acid and γ-linoleic acid with different conformations. In addition, in order to explore the reason for the observed redshifts of the resonance frequencies of the four FAs, the dielectric constants of the FAs were measured in the THz region. Furthermore, the four fatty acids were also attempted to be identified by Raman spectroscopy, which was difficult to accomplish unambiguously because of the effect of fluorescence. This result thus demonstrates the power and usefulness of metamaterial-assisted THz-TDS in the rapid determination of the FAs, and its potential as a versatile tool for investigation of biological metabolism, and for food product quality, safety inspection and control.
Collapse
Affiliation(s)
- Mingjie Tang
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Liangping Xia
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; School of Electronic Information Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Dongshan Wei
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan, 523808, Guangdong, China
| | - Shihan Yan
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
| | - Mingkun Zhang
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
| | - Zhongbo Yang
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
| | - Huabin Wang
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
| | - Chunlei Du
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
| | - Hong-Liang Cui
- Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China.
| |
Collapse
|
3
|
Minot C, Dupuis C, Cambril E, Garet F, Coutaz JL. Electrodynamic resonance of surface conduction and THz transmission through arrays of rectangular apertures in opaque metallic thin films. J Opt Soc Am A Opt Image Sci Vis 2019; 36:964-974. [PMID: 31158127 DOI: 10.1364/josaa.36.000964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
A modal method is developed analytically to investigate the THz optical transmission and reflection of a metallic thin film perforated by a 2D array of rectangular apertures. For subwavelength apertures, this optical model is interpreted in terms of passive electrical circuits, with interface admittances accounting for the THz surface conduction properties of the metallic film. The reactive component of the admittance of the evanescent diffraction cloud is shown to exhibit resonant behavior governed by the shape factors of the array. Interaction of such an electrodynamic resonance with the Rayleigh diffraction orders may alter their standard Fano profiles. Experimental evidence of the resonance is obtained owing to lineshape analysis of transmittance measurements in the THz range on metallic thin films deposited on a dielectric substrate, both above and below the first Wood-Rayleigh anomaly.
Collapse
|
4
|
Tang M, Zhang M, Yan S, Xia L, Yang Z, Du C, Cui HL, Wei D. Detection of DNA oligonucleotides with base mutations by terahertz spectroscopy and microstructures. PLoS One 2018; 13:e0191515. [PMID: 29364930 PMCID: PMC5783420 DOI: 10.1371/journal.pone.0191515] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 01/05/2018] [Indexed: 11/21/2022] Open
Abstract
DNA oligonucleotides with a 5-base mutation at the 3'-terminus were investigated by terahertz (THz) spectroscopy in a marker-free manner. The four single-stranded oligonucleotides with 17nt have been detected with specificity on a microfluidic chip, and corroborated by spectral measurements with split-ring resonators. The number of hydrogen bonds formed between the oligonucleotide and its surrounding water molecules, deemed a key contribution to the THz absorption of biological solutions, was explored by molecular dynamics simulations to explain the experimental findings. Our work underlies the feasibility of THz spectroscopy combined with microstructures for marker-free detection of DNA, which may form the basis of a prospective diagnostic tool for studying genic mutation.
Collapse
Affiliation(s)
- Mingjie Tang
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Mingkun Zhang
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Shihan Yan
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Liangping Xia
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Zhongbo Yang
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Chunlei Du
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Hong-Liang Cui
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
- College of Instrumentation Science and Electrical Engineering, Jilin University, Changchun, Jilin, China
| | - Dongshan Wei
- Chongqing Key laboratory of Multi-Scale manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
- * E-mail:
| |
Collapse
|
5
|
Woo JM, Hussain S, Jang JH. A terahertz in-line polarization converter based on through-via connected double layer slot structures. Sci Rep 2017; 7:42952. [PMID: 28211498 PMCID: PMC5314401 DOI: 10.1038/srep42952] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 01/17/2017] [Indexed: 11/09/2022] Open
Abstract
A terahertz (THz) in-line polarization converter that yields a polarization conversion ratio as high as 99.9% is demonstrated at 1 THz. It has double-layer slot structures oriented in orthogonal directions that are electrically connected by 1/8-wavelngth-long through-via holes beside the slot structures. The slots on the front metal-plane respond to the incident THz wave with polarization orthogonal to the slots and generates a circulating surface current around the slots. The surface current propagates along a pair of through-via holes that function as a two-wire transmission line. The propagating current generates a surface current around the backside slot structures oriented orthogonal to the slot structures on the front metal layer. The circulating current generates a terahertz wave polarized orthogonal to the backside slot structures and the 90° polarization conversion is completed. The re-radiating THz wave with 90° converted polarization propagates in the same direction as the incident THz wave.
Collapse
Affiliation(s)
- Jeong Min Woo
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Cheomdan-gwagiro 123, Gwangju 61005, South Korea.,Electrical Environment Research Center, Korea Electrotechnology Research Institute (KERI), 12, Bulmosan-ro 10Beon-gil, Changwon 51543, South Korea
| | - Sajid Hussain
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Cheomdan-gwagiro 123, Gwangju 61005, South Korea
| | - Jae-Hyung Jang
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Cheomdan-gwagiro 123, Gwangju 61005, South Korea.,Research Institute of Solar and Sustainable Energies, Gwangju Institute of Science and Technology, Cheomdan-gwagiro 123, Gwangju 61005, South Korea
| |
Collapse
|
6
|
Thompson ZJ, Stickel A, Jeong YG, Han S, Son BH, Paul MJ, Lee B, Mousavian A, Seo G, Kim HT, Lee YS, Kim DS. Terahertz-Triggered Phase Transition and Hysteresis Narrowing in a Nanoantenna Patterned Vanadium Dioxide Film. Nano Lett 2015; 15:5893-5898. [PMID: 26301339 DOI: 10.1021/acs.nanolett.5b01970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate that high-field terahertz (THz) pulses trigger transient insulator-to-metal transition in a nanoantenna patterned vanadium dioxide thin film. THz transmission of vanadium dioxide instantaneously decreases in the presence of strong THz fields. The transient THz absorption indicates that strong THz fields induce electronic insulator-to-metal transition without causing a structural transformation. The transient phase transition is activated on the subcycle time scale during which the THz pulse drives the electron distribution of vanadium dioxide far from equilibrium and disturb the electron correlation. The strong THz fields lower the activation energy in the insulating phase. The THz-triggered insulator-to-metal transition gives rise to hysteresis loop narrowing, while lowering the transition temperature both for heating and cooling sequences. THz nanoantennas enhance the field-induced phase transition by intensifying the field strength and improve the detection sensitivity via antenna resonance. The experimental results demonstrate a potential that plasmonic nanostructures incorporating vanadium dioxide can be the basis for ultrafast, energy-efficient electronic and photonic devices.
Collapse
Affiliation(s)
- Zachary J Thompson
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Andrew Stickel
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Young-Gyun Jeong
- Department of Physics and Astronomy and Center for Atomic Scale Electromagnetism, Seoul National University , Seoul 151-747, Republic of Korea
| | - Sanghoon Han
- Photonic Systems Laboratory, School of EECS, Seoul National University , Seoul 151-744, Republic of Korea
| | - Byung Hee Son
- Department of Physics and Department of Energy Systems Research, Ajou University , Suwon 443-749, Republic of Korea
| | - Michael J Paul
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Byounghwak Lee
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Ali Mousavian
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Giwan Seo
- Creative Research Center of Metal-Insulator Transition, Electronics and Telecommunications Research Institute , Daejeon 305-700, Republic of Korea
- School of Advanced Device Technology, University of Science & Technology , Daejeon 305-333, Republic of Korea
| | - Hyun-Tak Kim
- Creative Research Center of Metal-Insulator Transition, Electronics and Telecommunications Research Institute , Daejeon 305-700, Republic of Korea
- School of Advanced Device Technology, University of Science & Technology , Daejeon 305-333, Republic of Korea
| | - Yun-Shik Lee
- Department of Physics, Oregon State University , Corvallis, Oregon 97331-6507, United States
| | - Dai-Sik Kim
- Department of Physics and Astronomy and Center for Atomic Scale Electromagnetism, Seoul National University , Seoul 151-747, Republic of Korea
| |
Collapse
|
7
|
Xie L, Gao W, Shu J, Ying Y, Kono J. Extraordinary sensitivity enhancement by metasurfaces in terahertz detection of antibiotics. Sci Rep 2015; 5:8671. [PMID: 25728144 PMCID: PMC4345331 DOI: 10.1038/srep08671] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 01/26/2015] [Indexed: 12/21/2022] Open
Abstract
We have detected trace amounts of molecules of antibiotics (kanamycin sulfate) dispersed on metasurfaces with terahertz (THz) spectroscopy. Utilizing the extraordinary optical transmission resonance of an array of square-shaped slits on a silicon substrate at ~0.3 THz, we were able to monitor varying concentrations of kanamycin sulfate as low as ~100 picogram/L. In contrast, the lowest detectable concentration of kanamycin sulfate on silicon without any metallic structure was ~1 gram/L. This dramatic ~10(10) times enhancement of sensitivity is due to the near-field enhancement of THz electric fields by the metamaterial structure. This result thus demonstrates the power and usefulness of metamaterial-assisted THz spectroscopy in trace molecular detection for biological and chemical sensing as well as for food product quality and safety inspection and control.
Collapse
Affiliation(s)
- Lijuan Xie
- College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P. R. China
| | - Weilu Gao
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
| | - Jie Shu
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
| | - Yibin Ying
- College of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P. R. China
| | - Junichiro Kono
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
- Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA
- Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA
| |
Collapse
|
8
|
Park SJ, Hong JT, Choi SJ, Kim HS, Park WK, Han ST, Park JY, Lee S, Kim DS, Ahn YH. Detection of microorganisms using terahertz metamaterials. Sci Rep 2014; 4:4988. [PMID: 24832607 PMCID: PMC4023130 DOI: 10.1038/srep04988] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 04/28/2014] [Indexed: 12/23/2022] Open
Abstract
Microorganisms such as fungi and bacteria cause many human diseases and therefore rapid and accurate identification of these substances is essential for effective treatment and prevention of further infections. In particular, contemporary microbial detection technique is limited by the low detection speed which usually extends over a couple of days. Here we demonstrate that metamaterials operating in the terahertz frequency range shows promising potential for use in fabricating the highly sensitive and selective microbial sensors that are capable of high-speed on-site detection of microorganisms in both ambient and aqueous environments. We were able to detect extremely small amounts of the microorganisms, because their sizes are on the same scale as the micro-gaps of the terahertz metamaterials. The resonant frequency shift of the metamaterials was investigated in terms of the number density and the dielectric constants of the microorganisms, which was successfully interpreted by the change in the effective dielectric constant of a gap area.
Collapse
Affiliation(s)
- S J Park
- Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - J T Hong
- Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - S J Choi
- Department of Biological Science, Ajou University, Suwon 443-749, Korea
| | - H S Kim
- Department of Biological Science, Ajou University, Suwon 443-749, Korea
| | - W K Park
- Advanced Medical Device Research Center, Korea Electrotechnology Research Institute, Ansan 426-170, Korea
| | - S T Han
- Advanced Medical Device Research Center, Korea Electrotechnology Research Institute, Ansan 426-170, Korea
| | - J Y Park
- Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - S Lee
- Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - D S Kim
- Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - Y H Ahn
- Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| |
Collapse
|
9
|
Iwaszczuk K, Andryieuski A, Lavrinenko A, Zhang XC, Jepsen PU. Terahertz field enhancement to the MV/cm regime in a tapered parallel plate waveguide. Opt Express 2012; 20:8344-8355. [PMID: 22513546 DOI: 10.1364/oe.20.008344] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate field enhancement properties of a tapered parallel plate waveguide for ultrashort terahertz (THz) pulses. We use two independent methods, air biased coherent detection inside the waveguide and free-space electro-optic sampling, respectively, which enables a calibrated, quantitative measurement of the field strength at the output of the waveguide. Field enhancement factors greater than 20 are demonstrated and record-high field strengths of > 1.4 MV/cm are reached. We find an excellent agreement between the two independent methods of field measurement and a numerical 3D full-vectorial time-domain simulations.
Collapse
Affiliation(s)
- K Iwaszczuk
- DTU Fotonik, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | | | | | | | | |
Collapse
|
10
|
Vincenti MA, de Ceglia D, Roppo V, Scalora M. Harmonic generation in metallic, GaAs-filled nanocavities in the enhanced transmission regime at visible and UV wavelengths. Opt Express 2011; 19:2064-2078. [PMID: 21369023 DOI: 10.1364/oe.19.002064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have conducted a theoretical study of harmonic generation from a silver grating having slits filled with GaAs. By working in the enhanced transmission regime, and by exploiting phase-locking between the pump and its harmonics, we guarantee strong field localization and enhanced harmonic generation under conditions of high absorption at visible and UV wavelengths. Silver is treated using the hydrodynamic model, which includes Coulomb and Lorentz forces, convection, electron gas pressure, plus bulk χ(3) contributions. For GaAs we use nonlinear Lorentz oscillators, with characteristic χ(2) and χ(3) and nonlinear sources that arise from symmetry breaking and Lorentz forces. We find that: (i) electron pressure in the metal contributes to linear and nonlinear processes by shifting/reshaping the band structure; (ii) TE- and TM-polarized harmonics can be generated efficiently; (iii) the χ(2) tensor of GaAs couples TE- and TM-polarized harmonics that create phase-locked pump photons having polarization orthogonal compared to incident pump photons; (iv) Fabry-Perot resonances yield more efficient harmonic generation compared to plasmonic transmission peaks, where most of the light propagates along external metal surfaces with little penetration inside its volume. We predict conversion efficiencies that range from 10(-6) for second harmonic generation to 10(-3) for the third harmonic signal, when pump power is 2 GW/cm2.
Collapse
Affiliation(s)
- M A Vincenti
- AEgis Technologies Group, 410 Jan Davis Dr., Huntsville, AL 35806, USA.
| | | | | | | |
Collapse
|
11
|
Kyoung J, Seo M, Park H, Koo S, Kim HS, Park Y, Kim BJ, Ahn K, Park N, Kim HT, Kim DS. Giant nonlinear response of terahertz nanoresonators on VO2 thin film. Opt Express 2010; 18:16452-16459. [PMID: 20721032 DOI: 10.1364/oe.18.016452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report on an order of magnitude enhanced nonlinear response of vanadium dioxide thin film patterned with nanoresonators--nano slot antennas fabricated on the gold film. Transmission of terahertz radiation, little affected by an optical pumping for the case of bulk thin film, can now be completely switched-off: DeltaT/T approximately -0.9999 by the same optical pumping power. This unprecedentedly large optical pump-terahertz probe nonlinearity originates from the insulator-to-metal phase transition drastically reducing the antenna cross sections of the nanoresonators. Our scheme enables nanoscale-thin film technology to be used for all-optical switching of long wavelength light.
Collapse
Affiliation(s)
- Jisoo Kyoung
- Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|