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Takeshita H, Fathnan AA, Nita D, Nagata A, Sugiura S, Wakatsuchi H. Frequency-hopping wave engineering with metasurfaces. Nat Commun 2024; 15:196. [PMID: 38172183 PMCID: PMC10764809 DOI: 10.1038/s41467-023-44627-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 12/20/2023] [Indexed: 01/05/2024] Open
Abstract
Wave phenomena can be artificially engineered by scattering from metasurfaces, which aids in the design of radio-frequency and optical devices for wireless communication, sensing, imaging, wireless power transfer and bio/medical applications. Scattering responses vary with changing frequency; conversely, they remain unchanged at a constant frequency, which has been a long-standing limitation in the design of devices leveraging wave scattering phenomena. Here, we present metasurfaces that can scatter incident waves according to two variables-the frequency and pulse width-in multiple bands. Significantly, these scattering profiles are characterized by how the frequencies are used in different time windows due to transient circuits. In particular, by using more than one frequency with coupled transient circuits, we demonstrate variable scattering profiles in response to unique frequency sequences, which can break a conventional linear frequency concept and markedly increase the available frequency channels in accordance with a factorial number of frequencies used. Our proposed concept, which is analogous to frequency hopping in wireless communication, advances wave engineering in electromagnetics and related fields.
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Affiliation(s)
- Hiroki Takeshita
- Department of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan
| | - Ashif Aminulloh Fathnan
- Department of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan
- Research Center for Telecommunication (PRT), National Research and Innovation Agency (BRIN), Bandung, 40135, Indonesia
| | - Daisuke Nita
- Department of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan
| | - Atsuko Nagata
- Department of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan
| | - Shinya Sugiura
- Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo, 153-8505, Japan
| | - Hiroki Wakatsuchi
- Department of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan.
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2
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Wu FP, Zhang JT, Zhang HF. A theoretical study based on coherent perfect absorption and polarization separation in one-dimensional magnetized plasma photonic crystals. Phys Chem Chem Phys 2023; 25:25492-25498. [PMID: 37712358 DOI: 10.1039/d3cp02216a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
This article presents a study on tunable narrowband coherent perfect absorption (CPA), which can be altered by adjusting the initial phase to the ranges of 1.03α-1.13α (with α = 2πc/d) and 1.29α-1.43α. The relative bandwidths of these ranges are determined to be 8.5% and 7.4%, respectively. The study utilizes the transfer matrix method for calculations of the largest CPA amplitudes within one-dimensional (1D) magnetized plasma photonic crystals (MPPCs) across two absorption bands, achieving a maximum of 0.99 and 0.98, respectively. In addition, the phase modulation and amplitude modulation characteristics of the CPA are also discussed, and the results show that its absorption amplitude can be gradually modulated from 0.08 to 0.99 by the former and from 0.60 to 0.98 by the latter. The external magnetic fields have also been shown to limit the CPA amplitude between 0.41 and 0.99 within one band and between 0.52 and 0.99 within another band. The study further highlights the effect of plasma frequency and dielectric layer thickness on coherent band shifts towards high or low frequencies. Notably, the article presents the multiband polarization separation properties of 1D MPPCs, with calculated transmittance differences between the TM and TE waves of up to 0.70 and 0.74 at 1.13α and 1.37α, respectively.
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Affiliation(s)
- Fu Pei Wu
- College of and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
| | - Jia Tao Zhang
- College of and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
| | - Hai Feng Zhang
- College of and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
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Chittur Subramanianprasad P, Ma Y, Ihalage AA, Hao Y. Active Learning Optimisation of Binary Coded Metasurface Consisting of Wideband Meta-Atoms. SENSORS (BASEL, SWITZERLAND) 2023; 23:5546. [PMID: 37420713 DOI: 10.3390/s23125546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/15/2023] [Accepted: 06/06/2023] [Indexed: 07/09/2023]
Abstract
The design of a metasurface array consisting of different unit cells with the objective of minimizing its radar cross-section is a popular research topic. Currently, this is achieved by conventional optimisation algorithms such as genetic algorithm (GA) and particle swarm optimisation (PSO). One major concern of such algorithms is the extreme time complexity, which makes them computationally forbidden, particularly at large metasurface array size. Here, we apply a machine learning optimisation technique called active learning to significantly speed up the optimisation process while producing very similar results compared to GA. For a metasurface array of size 10 × 10 at a population size of 106, active learning took 65 min to find the optimal design compared to genetic algorithm, which took 13,260 min to return an almost similar optimal result. The active learning optimisation strategy produced an optimal design for a 60 × 60 metasurface array 24× faster than the approximately similar result generated by GA technique. Thus, this study concludes that active learning drastically reduces computational time for optimisation compared to genetic algorithm, particularly for a larger metasurface array. Active learning using an accurately trained surrogate model also contributes to further lowering of the computational time of the optimisation procedure.
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Affiliation(s)
| | - Yihan Ma
- School of Electronics Engineering and Computer Science, Queen Mary University of London, Mile End Rd, Bethnal Green, London E1 4NS, UK
| | - Achintha Avin Ihalage
- School of Electronics Engineering and Computer Science, Queen Mary University of London, Mile End Rd, Bethnal Green, London E1 4NS, UK
| | - Yang Hao
- School of Electronics Engineering and Computer Science, Queen Mary University of London, Mile End Rd, Bethnal Green, London E1 4NS, UK
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Zhang H, Zhang H. Ultra-broadband coherent perfect absorption via elements with linear phase response. OPTICS EXPRESS 2022; 30:37350-37363. [PMID: 36258325 DOI: 10.1364/oe.471906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
Increasing interest in perfect absorption of metasurface has initiated a discussion on the implementation of ultra-broadband coherent perfect absorption (CPA). Here, we present a mirror symmetric coherent absorption metasurface (CAMS) with polarization independence based on resistive thin films and annular metal patterns to force the fulfillment of ultra-broadband CPA in terahertz (THz) regime, controlling the interplay between electromagnetic waves and matter. By incorporating internal and external ring-shaped films with attached phase-delay lines, the desired phase response can be obtained, laying the foundation for implementing ultra-broadband coherent absorption. Simultaneously, by building a metal-medium composite structure superseding the dielectric substrate, additional promotion of the coherent absorptivity over the operation frequencies is realized. Manipulating the phase difference of two back-propagation coherent beams, the coherent absorptivity at 8.34-25.07 THz can be tailored successively from over 95.7% to as low as 38.1%. Moreover, with the incident angle up to 70° for the transverse electric wave, the coherent absorptivity is still over 74.8% from 8.34 THz to 25.07 THz. And for the transverse magnetic wave, at 6.67-24.2 THz, above 81.3% coherent absorptivity is visible with the incident angle increased from 0° to 60°. Our finding provides an interesting approach to designing ultra-broadband coherent absorption devices and may serve applications in THz modulators, all-optical switches, and signal processors.
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Luo P, Lan G, Nong J, Zhang X, Xu T, Wei W. Broadband coherent perfect absorption employing an inverse-designed metasurface via genetic algorithm. OPTICS EXPRESS 2022; 30:34429-34440. [PMID: 36242455 DOI: 10.1364/oe.468842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/22/2022] [Indexed: 06/16/2023]
Abstract
Coherent perfect absorption (CPA) possesses the unique characteristics of flexibly and actively molding the flow of light. However, restricted by the low design efficiency and limited geometry variety of metamaterial structures, the common CPA metamaterial absorbers based on artificial design show poor performance in bandwidth operation. Here, we proposed a tungsten-based metamaterial absorber to achieve broadband CPA via employing genetic algorithm inverse design. Under the irradiation of two coherent beams, the high coherent absorption (>90%) can be achieved within a wide range from 1.32 to 3.28 µm. By simply adjusting the relative intensity or phase difference of the two coherent beams, the absorption intensity can be continuously modulated to realize the transition between coherent perfect absorption and coherent perfect transparency. Moreover, the coherent absorption maintains greater than 90% over a broad range of incident angles for both TM and TE polarizations. The scattering matrix theorem is applied to explain the physical mechanism of CPA, and the analytical results exhibit good consistency with the numerical calculations. Such a tungsten-based CPA metamaterial absorber with broadband tunability and exceptional angular stability is expected to be utilized in optical signal processing chips, all-optical modulators, and optical switchers.
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Lu X, Li W, Zhu Z, Hu Y, Tang Z, Zhang W, Liu K, Su Y, Zheng J, Chen W, Tang M, Xie Z, Huang Y, Li L. Classification and Inverse Design of Metasurface Absorber in Visible Band. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xuehua Lu
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Wenbin Li
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Zhihui Zhu
- Sichuan Creating Sharing Opening Information Technologies Inc. Chengdu Sichuan Province 610042 China
| | - Yongqiang Hu
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Ziyi Tang
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Wenpeng Zhang
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Ke Liu
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Yarong Su
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Jie Zheng
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Weidong Chen
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Mingjun Tang
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Zhengwei Xie
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Yijia Huang
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
| | - Ling Li
- Laboratory of Micro‐Nano Optics School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China
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7
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Chen X, He D, Wu J. High-absorption grating-insulator-metal structures. APPLIED OPTICS 2021; 60:7480-7484. [PMID: 34613037 DOI: 10.1364/ao.427301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
A thin grating-insulator-metal (GIM) structure consisting of a top metal grating layer on a dielectric layer and a bottom metal layer is proposed, which shows a broadband high absorption at a small thickness. This phenomenon is attributed to the appropriate effective surface permittivity of the top grating layer and the cavity resonance of the middle insulator layer. By optimizing the structural and material parameters, the materials of the GIM structure from top to bottom are Mn, Al2O3, and Mn with thicknesses of 10, 70, and 70 nm, respectively. The structure with these optimum parameters is fabricated and characterized, and an improved performance with absorption exceeding 90% in the visible region is obtained using Mn as the metal layers. The experimental results are in good agreement with the numerical values, depicting an ultrabroad absorption bandwidth. The conclusions presented here could have potential applications in optical devices used for optical displacement detection and visible light absorption.
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Triple-Band Anisotropic Perfect Absorbers Based on α-Phase MoO 3 Metamaterials in Visible Frequencies. NANOMATERIALS 2021; 11:nano11082061. [PMID: 34443892 PMCID: PMC8399631 DOI: 10.3390/nano11082061] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 08/08/2021] [Accepted: 08/12/2021] [Indexed: 11/24/2022]
Abstract
Anisotropic materials provide a new platform for building diverse polarization-dependent optical devices. Two-dimensional α-phase molybdenum trioxides (α-MoO3), as newly emerging natural van der Waals materials, have attracted significant attention due to their unique anisotropy. In this work, we theoretically propose an anisotropic perfect metamaterial absorber in visible frequencies, the unit cell of which consists of a multi-layered α-MoO3 nanoribbon/dielectric structure stacked on a silver substrate. Additionally, the number of perfect absorption bands is closely related to the α-MoO3 nanoribbon/dielectric layers. When the proposed absorber is composed of three α-MoO3 nanoribbon/dielectric layers, electromagnetic simulations show that triple-band perfect absorption can be achieved for polarization along [100], and [001] in the direction of, α-MoO3, respectively. Moreover, the calculation results obtained by the finite-difference time-domain (FDTD) method are consistent with the effective impedance of the designed absorber. The physical mechanism of multi-band perfect absorption can be attributed to resonant grating modes and the interference effect of Fabry–Pérot cavity modes. In addition, the absorption spectra of the proposed structure, as a function of wavelength and the related geometrical parameters, have been calculated and analyzed in detail. Our proposed absorber may have potential applications in spectral imaging, photo-detectors, sensors, etc.
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Zhang H, Liu Z, Zhong H, Liu G, Liu X, Wang J. Metal-free plasmonic refractory core-shell nanowires for tunable all-dielectric broadband perfect absorbers. OPTICS EXPRESS 2020; 28:37049-37057. [PMID: 33379786 DOI: 10.1364/oe.405625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
In this work, we numerically demonstrate a new facile strategy for all-dielectric broadband optical perfect absorbers. A monolayer refractory titanium oxide and nitride (TiN/TiO2) core-shell nanowires array is used to form the grating on the opaque TiN substrate. Multiple resonant absorption bands are observed in the adjacent wavelength range, which therefore leads to the formation of an ultra-broadband absorption window from the visible to the infrared regime. The maximal absorption reaches 95.6% and the average absorption efficiency in the whole range (0.5-1.8 µm) is up to 85.4%. Moreover, the absorption bandwidth can be feasibly adjusted while the absorption efficiency can be still maintained in a high level via tuning the polarization state. Furthermore, the absorption window is observed to be highly adjustable in the wavelength range, showing a nearly linear relationship to the shell's index. These features not only confirm the achievement of the broadband perfect absorption but also introduce feasible ways to artificially manipulate the absorption properties, which will hold wide applications in metal-free plasmonic optoelectronic devices such as the solar harvesting, photo-detection, and thermal generation and its related bio-medical techniques.
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Li Z, Liu W, Tang C, Cheng H, Li Z, Zhang Y, Li J, Chen S, Tian J. A Bilayer Plasmonic Metasurface for Polarization‐Insensitive Bidirectional Perfect Absorption. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.201900216] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhancheng Li
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
| | - Wenwei Liu
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
| | - Chengchun Tang
- Quantum LaboratoryAlibaba Cloud Intelligence Business Group Alibaba Group Hangzhou 310000 China
| | - Hua Cheng
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
| | - Zhi Li
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
| | - Yuebian Zhang
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
| | - Junjie Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of Sciences Beijing 100190 China
| | - Shuqi Chen
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
- Renewable Energy Conversion and Storage CenterNankai University Tianjin 300071 China
- The Collaborative Innovation Center of Extreme OpticsShanxi University Taiyuan Shanxi 030006 China
- Collaborative Innovation Center of Light Manipulations and ApplicationsShandong Normal University Jinan 250358 China
| | - Jianguo Tian
- The Key Laboratory of Weak Light Nonlinear PhotonicsMinistry of EducationSchool of Physics and TEDA Institute of Applied PhysicsNankai University Tianjin 300071 China
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Cao J, Liu X, Chang Q, Yang Z, Zhou H, Fan T. Spectrally tunable nanocomposite metamaterials as near-perfect emitters for mid-infrared thermal radiation management. Phys Chem Chem Phys 2020; 22:28012-28020. [DOI: 10.1039/d0cp04902f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanocomposite absorbers possess a simple structure and tailorable absorption in the mid-infrared (MIR) region achieved by manipulating structural parameters.
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Affiliation(s)
- Jingrun Cao
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Xianghui Liu
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Qi Chang
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Zhiwei Yang
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Han Zhou
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Tongxiang Fan
- State Key Lab of Metal Matrix Composites
- School of Materials Science and Engineering
- Shanghai Jiao Tong University
- Shanghai
- China
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Long X, Yue W, Su Y, Chen W, Li L. Large-Scale, Bandwidth-Adjustable, Visible Absorbers by Evaporation and Annealing Process. NANOSCALE RESEARCH LETTERS 2019; 14:48. [PMID: 30756198 PMCID: PMC6372700 DOI: 10.1186/s11671-019-2881-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 01/27/2019] [Indexed: 05/30/2023]
Abstract
Optical absorbers have received a significant amount of attention due to their wide range of applications in biomedical sensing, solar cell, photon detection, and surface-enhanced Raman spectroscopy. However, most of the optical absorbers are fabricated with high-cost sophisticated nanofabrication techniques, which limit their practical applications. Here, we introduce a cost-effective method to fabricate an optical absorber by using a simple evaporation technique. The absorbers are composed of evaporated nanoparticles above a silver (Ag) mirror separated by a silicon oxide layer. Experimental results show over 77% absorption in the wavelength range from 470 to 1000 nm for the absorber with isolated Ag nanoparticles on the top. The performance of the absorber is adjustable with the morphology and composition of the top-layer nanoparticles. When the top layer was hybrid silver-copper (Ag-Cu) nanoparticles (NPs), the absorption exceeding 90% of the range of 495-562 nm (bandwidth of 67 nm) was obtained. In addition, the bandwidth for over 90% absorption of the Ag-Cu NP absorber was broadened to about 500 nm (506-1000 nm) when it annealed at certain temperatures. Our work provides a simple way to make a highly efficient absorber of a large area for the visible light, and to transit absorption from a narrow band to broadband only by temperature treatment.
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Affiliation(s)
- Xiyu Long
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610101 China
| | - Weisheng Yue
- State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu, 610209 China
| | - Yarong Su
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610101 China
| | - Weidong Chen
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610101 China
| | - Ling Li
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, 610101 China
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Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor. MATERIALS 2018; 11:ma11071091. [PMID: 29954060 PMCID: PMC6073872 DOI: 10.3390/ma11071091] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/24/2018] [Accepted: 06/25/2018] [Indexed: 01/21/2023]
Abstract
We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to excite the surface plasmon by scattering light through it at the normal incident. We numerically investigated the guiding performance. The proposed absorber is polarization independent and shows a maximum absorption of 99.8% at a 932 nm wavelength in the air medium. Considering the real applications, by varying the environments refractive indices from 1.33 to 1.41, the proposed absorber can maintain absorption at more than 99.7%, with a red shift of the resonant wavelength. Due to impedance matching of the electric and magnetic dipoles, the proposed absorber shows near-unity absorbance over the refractive indices range of 1.33 to 1.41, with a zero-reflectance property at a certain wavelength. This feature could be utilized as a plasmonic sensor in detecting the refractive index of the surrounding medium. The proposed plasmonic sensor shows an average sensitivity of 325 nm/RIU and a maximum sensitivity of 350 nm/RIU over the sensing range of 1.33 to 1.41. The proposed metadevice possesses potential applications in solar photovoltaic and photodetectors, as well as in organic and bio-chemical detection.
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