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【Plasmonics and Metamaterials】
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Plasmonics and Metamaterials
Tunable terahertz absorber based on transparent and flexible metamaterial
Download:783次
Junyu Xiao
1
Ruiwen Xiao
1
Rongxuan Zhang
1
Zhixiong Shen
2
[ ... ]
Yanqing Lu
2
Author Affiliations
Abstract
1
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2
National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
We demonstrate a tunable terahertz (THz) absorber based on an indium tin oxide (ITO) metamaterial. The upper ITO cross-shaped metasurface with different arm lengths is fabricated by direct femtosecond laser etching. The thickness of the middle dielectric layer is only 60 μm, which makes the absorber very transparent and flexible. The experimental results show that the THz resonant peaks have a high performance near 1 THz. By setting spacers of different thicknesses between the middle layer and the ITO mirror, a new type of tunable THz absorber is proposed. Its absorption peak frequency can be continuously adjusted from 0.92 to 1.04 THz between TE and TM polarization. This transparent THz metamaterial absorber is expected to be widely used in THz imaging, sensing, and biological detection.
tunable terahertz absorber
transparent metamaterial
flexible metamaterial
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Chinese Optics Letters
2020, 18(9): 092403
Plasmonics and Metamaterials
Active formatting modulation of electromagnetically induced transparency in metamaterials
Download:821次
Hao Sun
1
Yuhua Tang
1
Yuze Hu
2
Jie You
3
[ ... ]
Xin Zheng
3,*
Author Affiliations
Abstract
1
College of Computer, National University of Defense Technology, Changsha 410073, China
2
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
3
National Innovation Institute of Defense Technology, Beijing 100010, China
We experimentally demonstrate for the first time an active all-optical ultrafast modulation of electromagnetically induced transparency-like effect in a hybrid device of sapphire/Si/metamaterial. From numerical simulations, it can be deducted that the tuning process is attributed to the coupling between the dark mode existing in split-ring resonators and the bright mode existing in cut wire resonators. The transmission amplitude modulation is accompanied by the slow-light effect. In addition, the ultrafast formation process is measured to be as fast as 2 ps. This work should make an important contribution to novel chip-scale photonic devices and terahertz communications.
terahertz metamaterials
ultrafast photoswitching
electromagnetically induced transparency
all-optical device
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Chinese Optics Letters
2020, 18(9): 092402
Plasmonics and Metamaterials
Chromatic dispersion manipulation based on metasurface devices in the mid-infrared region
Download:1023次
Lin Li
1
Quan Yuan
1
Run Chen
1
Xiujuan Zou
1
[ ... ]
Shining Zhu
1,2,***
Author Affiliations
Abstract
1
National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing 210093, China
The chromatic aberration of metasurfaces limits their application. How to cancel or utilize the large chromatic dispersion of metasurfaces becomes an important issue. Here, we design Si-based metasurfaces to realize flexible chromatic dispersion manipulation in mid-infrared region. We demonstrate the broadband achromatic metalens and achromatic gradient metasurface to cancel the chromatic aberration over a continuous bandwidth (8–12 μm). In contrast, the metalens and gradient metasurface with enhanced chromatic dispersion have also been realized, where the focal length and deflection angle with different wavelengths vary more significantly than the conventional devices designed with geometric phase. These demonstrations indicate promising potential applications.
metasurfaces
chromatic dispersion manipulation
achromatic metalenses
super dispersion
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Chinese Optics Letters
2020, 18(8): 082401
Plasmonics and Metamaterials
Plasmonic Luneburg lens and plasmonic nano-coupler
Download:691次
Lei Zhang
1,2
Lin Wang
1,2
Yanqing Wu
1,3,*
Renzhong Tai
1,3,**
Author Affiliations
Abstract
1
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
In a single nanoscale device, surface plasmon polaritons (SPPs) have potential to match the different length scales associated with photonics and electronics. In this Letter, we propose an accurate design of a plasmonic metasurface Luneburg lens (PMLL) accommodating SPPs. The simulations indicate that the full width at half-maximum is 0.42 μm, and the focus efficiency is 78%. The characters of a PMLL have robustness to manufacturing errors. The PMLL is applied in a 10 μm long compact coupler model, which couples the SPPs to the 40 nm wide output waveguide. The couple efficiency is higher than that of a conventional taper coupler in a broad bandwidth. The design is compatible with standard lithography technology.
Luneburg
nano-coupler
plasmonics
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Chinese Optics Letters
2020, 18(9): 092401
Plasmonics and Metamaterials
Effective medium theory of checkboard structures in the long-wavelength limit
Download:697次
Zhanlei Hao
Yawen Zhuang
Ying Chen
*
Yineng Liu
**
Huanyang Chen
***
Author Affiliations
Abstract
Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology, Xiamen University, Xiamen 361005, China
Effective medium theory is a powerful tool to solve various problems for achieving multifarious functionalities and applications. In this article, we present a concise empirical formula about effective permittivity of checkboard structures for different directions. To verify our empirical formula, we perform simulations of checkboard periodic structures in squares, rectangles, and sectors in two dimensions. Our results show that the formula is valid in a large range of parameters. This work provides a new way to understand and design composite materials, which might lead to further optical applications in transformation optics.
effective medium theory
checkboard structures
effective permittivity
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Chinese Optics Letters
2020, 18(7): 072401
Plasmonics and Metamaterials
Morse lens [Invited]
Download:711次
Huanyang Chen
1,2,*
Wen Xiao
1,2
Author Affiliations
Abstract
1
Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Science and Detection Technology, Xiamen University, Xiamen 361005, China
2
Department of Electrical and Electronics Engineering, Xiamen University Malaysia, 43900 Sepang, Selangor, Malaysia
In this Letter, we find that Morse potential (proposed about 90 years ago) could be connected to Coulomb potential (or Newton potential) and harmonic potential (or Hooke potential) by conformal mappings. We thereby design a new conformal lens from Morse potential, Eaton lens, and Luneburg lens and propose a series of generalized Eaton/Luneburg lenses. We find that this Morse lens is a perfect self-focusing asymmetric lens that differs from a Mikaelian lens. Our theory provides a new insight to Morse potential and other traditional potentials, and revisits their classical applications on designing lenses.
Morse lens
generalized Eaton/Luneburg lenses
asymmetric self-focusing
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Chinese Optics Letters
2020, 18(6): 062403
Plasmonics and Metamaterials
Tunable beam deflection based on plasmonic resonators mounted freestanding thermoresponsive hydrogel
Download:510次
Ata Ur Rahman Khalid
Juan Liu
*
Naeem Ullah
Shiqi Jia
Author Affiliations
Abstract
Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
We propose and numerically demonstrate a dynamic beam deflector based on plasmonic resonator loaded thermoresponsive freestanding hydrogel that swells and collapses in water by temperature. For this purpose, we utilize four-step phase gradients mounted on freestanding hydrated hydrogel. For normal incidence, linearly orthogonal light deflects to 19.44° in the collapsed state and 14.40° in the swollen state of hydrogel. Furthermore, the light deflects at a third angle of 12.29° when the solvent changes from water to ethanol. It is expected that our metadesign will provide a platform for dynamic holography, active lensing, data storage, and anticounterfeiting.
tuning
beam deflector
hydrogel
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Chinese Optics Letters
2020, 18(6): 062402
Plasmonics and Metamaterials
Advancements in high refractive index media: from quantum coherence in atomic systems to deep sub-wavelength coupling in metamaterials [Invited]
Download:662次
Leena Singh
Weili Zhang
*
Author Affiliations
Abstract
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
Refractive index enhancement is crucial in the fields of lithography, imaging, optical communications, solar devices, and many more. We present a review of advancements in the process of designing high refractive index metamaterials, starting from quantum coupling and photonic bandgap materials to metamaterials utilizing deep subwavelength coupling to achieve ever-high values of refractive index. A particular attention is given to experimentally verified schemes in engineering a high index of refraction. The understanding of the evolution of material design from intrinsic electronic states manipulation to meta-atoms design is not only fascinating but also a prerequisite to developing successful devices and applications.
high refractive index
metamaterials
review
sub-wavelength coupling
quantum coherence
terahertz
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Chinese Optics Letters
2020, 18(6): 062401
Plasmonics and Metamaterials
Wide range bilayer aluminum nanowire grating sensors with robust reflective peaks
Download:646次
Zhicheng Ye
1,*
Jun Zheng
2
Author Affiliations
Abstract
1
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
A grating-coupled surface plasmon resonance sensor based on bilayer aluminum nanowire arrays is fabricated by laser interference lithography. The device presents impressive reflective sharp peaks by lateral surface plasmon resonances even for aluminum thicknesses of merely several nanometers. Distinct reflective peaks and dramatic color shifts under different analytes are observed within a wide range of incident angle, metal thickness, and refractive index. The sensitivity of 307 nm per refractive index unit is experimentally obtained. The reflective-peak-type surface plasmon resonance sensors are suitable for practical applications because of easy fabrication, low cost, wide range, and high signal visibility.
surface plasmons
subwavelength structure
nanostructures
sensor
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Chinese Optics Letters
2020, 18(5): 052401
Plasmonics and Metamaterials
A polarization-insensitive fishnet/spacer/mirror plasmonic absorber for hot electron photodetection application
Download:892次
Zhiqiang Yang
1
Kang Du
1
Wending Zhang
1
Soojin Chua
2,3
Ting Mei
1,*
Author Affiliations
Abstract
1
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, North Western Polytechnical University, Xi’an 710072, China
2
Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
3
LEES Program, Singapore-MIT Alliance for Research & Technology (SMART), Singapore 138602, Singapore
A polarization-insensitive plasmonic absorber is designed consisting of Au fishnet structures on a TiO
2
spacer/Ag mirror. The fishnet structures excite localized surface plasmon and generate hot electrons from the absorbed photons, while the TiO
2
layer induces Fabry–Perot resonance, and the Ag mirror acts as a back reflector. Through optimizing the TiO
2
layer thickness, numerical simulation shows that 97% of the incident light is absorbed in the Au layer. The maximum responsivity and external quantum efficiency of the device can approach 5 mA/W and ~1%, respectively, at the wavelength of 700 nm.
plasmonic absorber
Fabry–Perot resonance
internal photoemission
surface plasmon
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Full Text
Chinese Optics Letters
2020, 18(5): 052402
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