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Yan Z, Tang C, Wu G, Tang Y, Gu P, Chen J, Liu Z, Huang Z. Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate. NANOMATERIALS 2020; 11:nano11010063. [PMID: 33383802 PMCID: PMC7823822 DOI: 10.3390/nano11010063] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/20/2020] [Accepted: 12/26/2020] [Indexed: 11/16/2022]
Abstract
Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.
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Affiliation(s)
- Zhendong Yan
- College of Science, Nanjing Forestry University, Nanjing 210037, China;
| | - Chaojun Tang
- Center for Optics and Optoelectronics Research, Collaborative Innovation Center for Information Technology in Biological and Medical Physics, College of Science, Zhejiang University of Technology, Hangzhou 310023, China
- Correspondence: (C.T.); (J.C.); (Z.L.)
| | - Guohua Wu
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; (G.W.); (Y.T.); (P.G.)
| | - Yumei Tang
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; (G.W.); (Y.T.); (P.G.)
| | - Ping Gu
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; (G.W.); (Y.T.); (P.G.)
| | - Jing Chen
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; (G.W.); (Y.T.); (P.G.)
- Correspondence: (C.T.); (J.C.); (Z.L.)
| | - Zhengqi Liu
- College of Physics Communication and Electronics, Jiangxi Normal University, Nanchang 330022, China
- Correspondence: (C.T.); (J.C.); (Z.L.)
| | - Zhong Huang
- College of Physics and Electronic Engineering, Jiangsu Second Normal University, Nanjing 210013, China;
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Li L, Wu S, Li L, Zhou Z, Ding H, Xiao C, Li X. Gap-mode excitation, manipulation, and refractive-index sensing application by gold nanocube arrays. NANOSCALE 2019; 11:5467-5473. [PMID: 30855617 DOI: 10.1039/c8nr09073d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The challenges in fabricating two-dimensional metallic nanostructures over large areas, which normally involve expensive and time-consuming nanofabrication techniques, have severely limited the exploration of the related applications based on plasmon-induced effects. Here, we cost-efficiently prepared large-area Au nanocube arrays (NCAs) using only the electrostatic forces between colloidal Au nanocubes and polyelectrolyte layers. This method provides a flexible way for obtaining controlled Au NCAs with various fill fractions and single-cube sizes. When the Au NCAs were arranged to be coupled with a continuous Au film, the plasmonic gap mode could be excited and manipulated, leading to significant and tunable light absorbance from the visible to the near-infrared parts of the spectrum. Besides, the as-prepared Au NCAs were used to construct a prototype refractive-index (RI) sensor, which exhibited excellent stability and sensitivity over 560 nm per RI unit.
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Affiliation(s)
- Liang Li
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
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Guo S, Talebi N, Campos A, Kociak M, van Aken PA. Radiation of Dynamic Toroidal Moments. ACS PHOTONICS 2019; 6:467-474. [PMID: 31523699 PMCID: PMC6735299 DOI: 10.1021/acsphotonics.8b01422] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Indexed: 05/27/2023]
Abstract
Dynamic toroidal dipoles, a distinguished class of fundamental electromagnetic sources, receive increasing interest and participate in fascinating electrodynamic phenomena and sensing applications. As described in the literature, the radiative nature of dynamic toroidal dipoles is sometimes confounded, intermixing with static toroidal dipoles and plasmonic dark modes. Here, we elucidate this issue and provide proof-of-principle experiments exclusively on the radiation behavior of dynamic toroidal moments. Optical toroidal modes in plasmonic heptamer nanocavities are analyzed by electron energy loss spectroscopy and energy-filtered transmission electron microscopy supported by finite-difference time-domain numerical calculations. Additionally, their corresponding radiation behaviors are experimentally investigated by means of cathodoluminescence. The observed contrasting behaviors of a single dynamic toroidal dipole mode and an antiparallel toroidal dipole pair mode are discussed and elucidated. Our findings further clarify the electromagnetic properties of dynamic toroidal dipoles and serve as important guidance for the use of toroidal dipole moments in future applications.
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Affiliation(s)
- Surong Guo
- Stuttgart
Center for Electron Microscopy, Max Planck
Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart 70569, Germany
| | - Nahid Talebi
- Stuttgart
Center for Electron Microscopy, Max Planck
Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart 70569, Germany
| | - Alfredo Campos
- Laboratoire
de Physique des Solides, Université
Paris Sud, Orsay 91400, France
| | - Mathieu Kociak
- Laboratoire
de Physique des Solides, Université
Paris Sud, Orsay 91400, France
| | - Peter A. van Aken
- Stuttgart
Center for Electron Microscopy, Max Planck
Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart 70569, Germany
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Sun S, Yang W, Zhang C, Jing J, Gao Y, Yu X, Song Q, Xiao S. Real-Time Tunable Colors from Microfluidic Reconfigurable All-Dielectric Metasurfaces. ACS NANO 2018; 12:2151-2159. [PMID: 29469563 DOI: 10.1021/acsnano.7b07121] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Structural colors arising from all-dielectric nanostructures are very promising for high-resolution color nanoprinting and high-density optical storage. However, once the all-dielectric nanostructures are fabricated, their optical performances are usually static or change slowly, significantly limiting the practical applications in advanced displays. Herein, we experimentally demonstrate the real-time tunable colors with microfluidic reconfigurable all-dielectric metasurfaces. The metasurface is composed of an array of TiO2 nanoblocks, which are embedded in a polymeric microfluidic channel. By injecting solutions with a different refractive index into the channel, the narrow band reflection peak and the corresponding distinct colors of a TiO2 metasurface can be precisely controlled. The transition time is as small as 16 ms, which is orders of magnitude faster than the current techniques. By varying the lattice size of TiO2 metasurfaces, the real-time tunable colors are able to span the entire visible spectrum. Meanwhile, the injection and ejection of solvent have also shown the capability of the erasion and the restoration of information encoded in TiO2 metasurfaces. The combination of all-dielectric nanostructures with microfluidic channels shall boost their applications in functional color display, banknote security, anticounterfeiting, and point-of-care devices.
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Affiliation(s)
- Shang Sun
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Wenhong Yang
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Chen Zhang
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Jixiang Jing
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Yisheng Gao
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Xiaoyi Yu
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Qinghai Song
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
| | - Shumin Xiao
- State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School , Harbin Institute of Technology , Shenzhen , Guangdong 518055 , P.R. China
- Collaborative Innovation Center of Extreme Optics , Shanxi University , Taiyuan , Shanxi 030006 , P.R. China
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Zou X, Zheng G, Cong J, Xu L, Chen Y, Lai M. Polarization-insensitive and wide-incident-angle optical absorber with periodically patterned graphene-dielectric arrays. OPTICS LETTERS 2018; 43:46-49. [PMID: 29328193 DOI: 10.1364/ol.43.000046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 11/28/2017] [Indexed: 06/07/2023]
Abstract
A polarization-insensitive and angle-independent graphene absorber (GA) with periodically patterned grating is demonstrated. A periodic nanocavity composed of multilayer subwavelength grating and metal substrate supports a strongly localized mode inside the cavity, where the mode helps to absorb more electromagnetic waves. The proposed GA exhibits polarization-insensitive behavior and maintains the high absorption above 90% within a wide range of incident angle (more than 80°). We attribute the high absorption to the excitation of the cavity mode resonance and magnetic resonance for the transverse electric and transverse magnetic polarizations, respectively. The proposed GA has potential applications in the design of various devices, such as optical modulators or tunable absorption filters because of its remarkable angle-insensitive absorption performance.
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