Article
Physics, Applied
Peng Shen, Xicheng Xiong, Wei Zhang, Yufang Liu, Jun Zhang, Kun Yu
Summary: An active plasmonic device is designed to support multiple perfect absorption peaks by exciting highly concentrated graphene surface plasmons through silicon-based diffractive gratings. The absorption spectrum can be effectively controlled over a wide wavelength range by changing the Fermi levels, relaxation time of the graphene, and geometric parameters of the device.
APPLIED PHYSICS EXPRESS
(2022)
Article
Optics
Jinhua Hu, Junfang Liang, Jun Zou, Chaoying Shi, Jijun Zhao
Summary: An all-dielectric resonant cavity based on a zero-contrast grating (ZCG) is proposed for perfect absorption of monolayer graphene at 1550 nm wavelength. The absorption peaks can be tuned by adjusting the structural parameters, such as the thickness of the waveguide layer and the cavity length. The proposed structure has potential application prospects for high-performance graphene-based optoelectronic devices.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Xiuhong Liu, Sikai Zhang, Jinhua Hu, Haiyan Han
Summary: This paper presents the design and performance of a multi-band graphene absorber. By adjusting the characteristics and thickness of each layer, a near-perfect absorption spectrum can be achieved. The design of this absorber takes into account multiple physical mechanisms, making it highly applicable.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Mingsen Pan, Aaron Liu, Zhonghe Liu, Weidong Zhou
Summary: In this paper, a fast tunable optical absorber based on the critical coupling of resonance mode and the plasma dispersion effect is proposed. The absorber can switch between perfect absorption and total reflection by modulating the refractive index, and has potential applications in various fields.
Article
Optics
Ting-Hui Xiong, Kai Zhao, Wei Li, Yu-Xiang Peng, Meng-Dong He, Kai-Jun Wang, Xin-Min Zhang, Jian-Bo Li, Jian-Qiang Liu
Summary: This paper proposes a tunable multiband metamaterial coherent perfect absorber using graphene and VO2 particles' plasmon resonance modes. The absorption spectrum exhibits three high absorptivity peaks, with the range of absorption peak adjustment based on graphene's plasmon resonance mode being 7.88 µm. The absorption peak stemming from the plasmon resonance mode of VO2 particle disappears as VO2 transitions from the metal phase to the insulating phase. Modulation depth of absorption peak can reach 98.85% by controlling the relative phase of two coherent light beams. The resonance wavelengths and intensities of absorption peaks are influenced by array period, side length of VO2 particle, and silica layer thickness. The findings in this study are important for the engineering of actively tunable nano plasmonic devices and metamaterials.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Gongli Xiao, Zhixiong Lin, Hongyan Yang, Yanping Xu, Sitong Zhou, Haiou Li, Xingpeng Liu, Peihua Wangyang
Summary: This paper numerically investigates a tunable and anisotropic perfect absorber in a graphene-black phosphorus nanoblock array structure. The suggested structure exhibits polarization-dependent anisotropic absorption in the mid-infrared, and the absorption spectra can be tailored by adjusting the geometrical parameters and doping amounts. The results have the potential in the design of polarization-selective and tunable high-performance devices in the mid-infrared.
Article
Engineering, Electrical & Electronic
Li-an Bian, Yu Liu, Yaokun Wang, Kaicheng Huang
Summary: An innovative terahertz absorber has been designed by integrating graphene dielectric stack (GDS) above and metal grating below, leading to the emergence of two near-unity absorption modes under impedance matching conditions. These modes can be shifted by tuning the chemical potential or period of GDS.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Physics, Condensed Matter
Xiaojun Zhu, Delian Lu, Shanshan Ma, Haixia Da
Summary: This study demonstrates the improved light-matter interaction in monolayer MoS2-based grating structures, resulting in enhanced Goos-Ha.nchen shift. The guided mode resonance in the dielectric grating layer contributes to the significant enhancement of GH shift. The asymmetric grating with monolayer MoS2 achieves a GH shift three times larger than the symmetric grating. The magnitude and sign of GH shift can be controlled by the parameters of the dielectric grating layer. This work reveals an alternative approach to improve and engineer the GH shift of layered TMDC semiconductors.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Liying Jiang, Chuang Yuan, Zhiyou Li, Ju Su, Zao Yi, Weitang Yao, Pinghui Wu, Zhimin Liu, Shubo Cheng, Miao Pan
Summary: This study utilizes the Finite Difference Time Domain (FDTD) method to simulate a multi-band ideal absorber and proposes a new method based on critical coupling and guided resonance. The physical mechanism is analyzed through impedance matching and coupled mode theory (CMT). By adjusting the geometric parameters of the structure, the spectral position and absorption rate of the absorption peak can be tuned.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Optics
Shiwang Yu, Zhancheng Li, Wenwei Liu, Hua Cheng, Yuebian Zhang, Boyang Xie, Wenyuan Zhou, Jianguo Tian, Shuqi Chen
Summary: This study demonstrates the use of vanadium dioxide (VO2)-assisted metasurfaces for tunable dual-band and high-quality-factor perfect absorption in the mid-infrared region. The potential applications of these metasurfaces in reflective intensity manipulation and optical switching are discussed, highlighting their suitability for dynamic and multifunctional optical devices.
Article
Engineering, Electrical & Electronic
Ze-Tao Huang, Hao-Yi Jiang, Zi-Ye Wang, Ye-Ming Qing, Bing-Xiang Li
Summary: We propose a thermally-electrically tunable perfect absorber based on amorphous silicon (a-Si) and graphene, which can achieve narrow bandwidth perfect absorption due to guided-mode resonance. The resonance wavelength can be thermally tuned with high efficiency and linear controllability through Joule heating, thanks to the linear relationship between refractive index of a-Si and temperature. Additionally, by adjusting the gate voltage, the chemical potential of graphene can be electrically modified, enabling a rapid switching of perfect absorption and perfect reflection. The proposed absorber features a simple structure, perfect absorption, and efficient thermal-electric tunability, showing great potential in applications such as modulators, optical switches, and selective filters.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Analytical
Shuhua Cao, Qi Wang, Xufeng Gao, Shijie Zhang, Ruijin Hong, Dawei Zhang
Summary: This paper presents a tunable absorber based on an asymmetric grating composed of a graphene-dielectric-metal structure, with the absorption rate and wavelength in the near-infrared region adjustable by varying the Fermi energy of graphene and grating period. The influence of other geometrical parameters, incident angle, and polarization is analyzed through simulation. The proposed absorbers have potential applications as gas sensors, with a sensitivity of 200 nm/RIU and FOM up to 159 RIU-1.
Article
Optics
Fang Chen
Summary: This paper demonstrates wide-angle infrared perfect absorption using a double-layer graphene strip grating coupled with a silicon dioxide grating. Dual-band perfect absorption is achieved by adjusting strip width or chemical potential of the bi-layer graphene strip grating. The proposed absorber shows excellent absorption stability for a wide range of incident angles.
Article
Materials Science, Multidisciplinary
Jinping Tian, Rujiao Ke, Rongcao Yang, Weihua Pei
Summary: A classic three-layer metamaterial absorber is designed for quad-band perfect absorption, with four absorption bands occurring in the 3-11 THz frequency range. Tuning of absorption properties can be achieved by adjusting the Fermi level or relaxation time of graphene, and the absorber is independent of the polarization of the input electromagnetic wave.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Shanshan Ma, Xiaojun Zhu, Delian Lu, Haixia Da
Summary: The study shows that a relatively large GH shift can be achieved in the dual dielectric grating layers with monolayer graphene by joint excitation of guided mode resonance in both the upper and lower layers. Control over the magnitude and position of GH shifts is possible by adjusting the chemical potential of monolayer graphene and the geometrical parameters of the dual dielectric grating layers. This work opens up possibilities for novel optoelectronic devices utilizing the combined structure of dual dielectric grating layers and two-dimensional layered structures.
Article
Optics
Jicheng Wang, Chunyu Lu, Zheng-Da Hu, Chen Chen, Liang Pan, Weiqiang Ding
Article
Physics, Applied
Chunyu Lu, Zheng-Da Hu, Jin Cui, Jicheng Wang, Liang Pan
APPLIED PHYSICS EXPRESS
(2019)
Article
Optics
Chunyu Lu, Hamed Nikbakht, Mustafa Karabiyik, Musa Alaydrus, B. Imran Akca
Summary: A novel self-referencing and multiplexed refractive index sensor based on a compound optical microresonator structure was proposed, with high sensitivity and maximum figure of merit achieved. The sensing peaks shift linearly with increased cladding refractive index, while FP peaks remain constant, eliminating the temperature effect on measurements.
Article
Optics
Chunyu Lu, Musa Alaydrus, Hamed Nikbakht, B. Imran Akca
Summary: We propose a coupled optical microresonator system that can generate asymmetric Fano-like resonances and dynamically control their line shapes and frequencies. The system consists of two microring resonators coupled via a 3 x 3 coupler, with the upper microring resonator being the add-drop type and the lower one being the all-pass type. Through simulation, we observed asymmetric Fano line shapes in the transmission spectra and demonstrated that the line shapes and frequencies of Fano resonances can be controlled by varying the refractive index of the microring resonators.
