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Lee C, Jeon S, Kim SJ, Kim SJ. Near-flat top bandpass filter based on non-local resonance in a dielectric metasurface. OPTICS EXPRESS 2023; 31:4920-4931. [PMID: 36785447 DOI: 10.1364/oe.480757] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 01/10/2023] [Indexed: 06/18/2023]
Abstract
Localized light matter interaction at a resonant nanostructure facilitates spectrally selective transmission of light, which has led to demonstrations of ultrathin metasurface based optical filters. Unfortunately, due to the nature of Lorentzian spectral line shape in such resonances, it is inevitable to suffer significant spectral crosstalk. In this work, we demonstrate a conceptually new type of spectral filter which exhibits near flat-top bandpass with minimized spectral overlaps. To realize this, we leverage the recent development of non-local resonance in dielectric nanostructure to design a double-layered optical filter with performance comparable to the ideal spectral filters. The designed metasurface shows averaged transmission of more than 90% across the target spectral band and suppressed transmission of less than 10% out of the spectral band.
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Gao X, Wang Q, Zhang S, Hong R, Zhang D, Zhuang S. Polarization tunable transmitted full-color display enabling switchable bright and dark states. OPTICS EXPRESS 2023; 31:3083-3091. [PMID: 36785307 DOI: 10.1364/oe.480120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/20/2022] [Indexed: 06/18/2023]
Abstract
Although structural colors based on nanostructures have attracted many researchers' attentions due to their superior durability and high resolution, most previous reports focused on the static and dynamic structural colors in reflection mode and few researchers focus on the static and dynamic transmission colors for high-saturation RGB models. Here, the hybrid Al-Si3N4 nanogratings with the top SiO2 capping layer and the bottom MgF2 layer that can switch full-hue and high-saturation transmitted structural colors on and off completely by changing the polarization state are theoretically demonstrated. Meanwhile, the hybrid Al-Si3N4 nanogratings with the top capping layer and the bottom layer also achieve the transmittance spectra with the full width at half maximum of ∼58 nm and the transmittance efficiency of over 70% in the on state. The added top capping layer and bottom layer can suppress the sideband of transmittance spectra in the on state and maintain the near-zero transmittance in the off state, thus improving the switching performance between bright and dark states. The realizable high-saturation colors in the on state can take up 125% sRGB space and 80% Adobe sRGB space. More interestingly, with the incident angle varying from 0° to 50°, full-hue color can be also realized in the on state and nearly black color can be also maintained in the off state. The strategy will provide potential applications in advanced color encryption and multichannel imaging.
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Gao L, Li X, Liu D, Wang L, Yu Z. A Bidirectional Deep Neural Network for Accurate Silicon Color Design. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1905467. [PMID: 31696973 DOI: 10.1002/adma.201905467] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 09/26/2019] [Indexed: 05/15/2023]
Abstract
Silicon nanostructure color has achieved unprecedented high printing resolution and larger color gamut than sRGB. The exact color is determined by localized magnetic and electric dipole resonance of nanostructures, which are sensitive to their geometric changes. Usually, the design of specific colors and iterative optimization of geometric parameters are computationally costly, and obtaining millions of different structural colors is challenging. Here, a deep neural network is trained, which can accurately predict the color generated by random silicon nanostructures in the forward modeling process and solve the nonuniqueness problem in the inverse design process that can accurately output the device geometries for at least one million different colors. The key results suggest deep learning is a powerful tool to minimize the computation cost and maximize the design efficiency for nanophotonics, which can guide silicon color manufacturing with high accuracy.
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Affiliation(s)
- Li Gao
- Key Laboratory for Organic Electronics and Information Displays (KLOEID), Institute of Advanced Materials (IAM), School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Xiaozhong Li
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Dianjing Liu
- School of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Lianhui Wang
- Key Laboratory for Organic Electronics and Information Displays (KLOEID), Institute of Advanced Materials (IAM), School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Zongfu Yu
- School of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
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Kim JU, Jeon S, Heo M, Kim HM, Kim R, Kim N, Lee YH, Shin J. Near-atomically flat, chemically homogeneous, electrically conductive optical metasurface. NANOSCALE 2019; 11:9580-9586. [PMID: 31062774 DOI: 10.1039/c8nr10436k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metasurfaces, or two-dimensional arrays of subwavelength-scale structures, can exhibit extraordinary optical properties. However, typical metasurfaces have a bumpy surface morphology that may restrict their practical applications. Here, we propose and demonstrate an optical metasurface that is composed of a thin metallic film, with hidden dielectric structures underneath, and a metal back mirror layer. Exploiting the large difference between the Thomas-Fermi screening length for longitudinal electric fields and the skin depth for transverse electromagnetic fields, the near-atomically flat top surface of the proposed structure can appear homogeneous chemically and electrically but highly inhomogenous optically. The size and shape of the hidden dielectric structures as well as the thickness of the top metallic layer can be tailored to acquire desired optical properties. We performed both theoretical and experimental studies of the proposed metasurface, finding a good agreement between them. This work provides a new platform for ultra-flat optical devices, such as a wavelength selective electrode, diffusive back reflector, meta-lens, and plasmonically enhanced optical biosensors.
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Affiliation(s)
- Jong Uk Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
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Xu P, Lv X, Chen J, Li Y, Qian J, Chen Z, Qi J, Sun Q, Xu J. Dichroic Optical Diode Transmission in Two Dislocated Parallel Metallic Gratings. NANOSCALE RESEARCH LETTERS 2018; 13:392. [PMID: 30515587 PMCID: PMC6279674 DOI: 10.1186/s11671-018-2818-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 11/23/2018] [Indexed: 06/09/2023]
Abstract
An optical diode structure with two dislocated parallel metallic gratings is proposed and investigated numerically. Dichroic optical diode transmission is realized in this structure, i.e., optical diode effect is observed in two wavebands corresponding to inverse transmission directions. In the structure, two parallel metallic gratings with different grating constants are separated by a dielectric slab in between. The first illuminated grating acts as a selector for exciting surface plasmons at a proper wavelength. The other grating acts as an emitter to realize optical transmission. When the incident direction is reversed, the roles of two gratings exchange and surface plasmons are excited at another wavelength. In dichroic transmission wavebands, the optical diode structure exhibits extraordinary transmission and possesses high optical isolation up to 1. Furthermore, the operating wavebands can be modulated by changing structure parameters.
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Affiliation(s)
- Pengwei Xu
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
| | - Xuefeng Lv
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
| | - Jing Chen
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006 Shanxi China
| | - Yudong Li
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006 Shanxi China
| | - Jun Qian
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
| | - Zongqiang Chen
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
| | - Jiwei Qi
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006 Shanxi China
| | - Qian Sun
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006 Shanxi China
- College of Environmental Science and Engineering/Sino-Canada R&D Center on Water and Environmental Safety, Nankai University, Tianjin, 300071 China
| | - Jingjun Xu
- MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics and Technology of Information Science, School of Physics, Nankai University, Tianjin, 300071 China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006 Shanxi China
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