Article
Optics
Zhonglei Shen, Liuyang Zhang, Xuefeng Chen
Summary: Mechanically and electrically tunable infrared absorbers based on crumpled graphene structures demonstrate broad spectra tunability and high sensing sensitivity. They hold promising potentials in high-sensitivity flexible sensing applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Timur Ashirov, Ali Coskun
Summary: Membranes are crucial in gas separation for their low cost, energy efficiency, and durability. Researchers have developed a new concept to enhance selectivity of graphene-based membranes by depositing microislands of Pd and Ni on the support layer, enabling efficient separation of specific gases like H2 and CO2. This approach may offer a promising alternative for economical gas separation by selectively targeting individual gases in a membrane setting through adsorptive separation at room temperature.
Article
Engineering, Electrical & Electronic
Banxian Ruan, Chao Liu, Cuixiu Xiong, Min Li, Baihui Zhang, Enduo Gao, Kuan Wu, Hongjian Li
Summary: The study investigated a grating coupled graphene surface plasmon and planar waveguide structure, revealing a sharp asymmetric Fano resonance attributed to the coupling between graphene plasmon and waveguide mode. The physical origin of Fano resonance was analyzed, demonstrating tunable properties and potential applications in light absorption and refractive index sensing. The proposed Fano resonance shows promise in developing functional devices for excellent light absorption and refractive index sensing.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Xian Zhang, Yangyang Xu, Xiao-Song Zhu, Yi-Wei Shi
Summary: A dielectric/Ag-coated hollow fiber (HF) temperature sensor based on long-range surface plasmon resonance (LRSPR) is proposed and experimentally demonstrated. The sensor achieves a temperature sensitivity of 3.6 to 20.5 nm/℃, which is one of the highest reported among optical fiber temperature sensors. The detection range of the sensor can be easily tuned up to 170℃, offering an outstanding advantage compared to temperature sensors using polydimethylsiloxane.
Article
Chemistry, Multidisciplinary
Xiaoyan Zhang, Tingxian Liu, Aimee Boyle, Azadeh Bahreman, Lei Bao, Qiushi Jing, Honglei Xue, Roxanne Kieltyka, Alexander Kros, Gregory F. Schneider, Wangyang Fu
Summary: This study demonstrates the use of electrolyte gating and ultrahigh-frequency technology to enhance the sensitivity of graphene biosensors. By canceling out ionic screening at ultrahigh frequencies, the biosensors can be directly used in high-salt solutions. By combining electrolyte gating and ultrahigh-frequency reflectometry, the graphene biosensors enable real-time monitoring of biomolecular and cell interactions with superior detection limits.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Konstantin G. Wirth, Heiko Linnenbank, Tobias Steinle, Luca Banszerus, Eike Icking, Christoph Stampfer, Harald Giessen, Thomas Taubner
Summary: In this study, the electronic properties of bilayer graphene were directly probed using s-SNOM measurements with a broadly tunable laser source. The complex optical conductivity resonance in BLG around 0.39 eV was successfully retrieved and reconstructed with nanoscale resolution. This technique offers a new approach for nanoscopic noncontact measurements of electronic properties in complex material systems.
Article
Optics
Lu Fa Shen, Jian Ping Xie, Zi Hua Wang
Summary: By investigating TM modes in a slab waveguide with a graphene-dielectric multilayer structure, it is found that the group velocity of TM modes can be positive, negative, and zero, with the gate voltage affecting the standstill of electromagnetic waves at different waveguide thickness. The gate voltages have a greater influence on zero and negative group velocities at frequencies above 7.0 THz.
Article
Optics
Zixuan Du, Rujun Zhou, Si Luo, Ding Zhao, Wei Long, Qiang Ling, Zhangwei Yu, Daru Chen
Summary: In this paper, a dynamically tunable graphene metasurface is proposed for multi-band refractive index sensing and four-state optical switching. The design exhibits dual-channel resonance modes and achieves ultrahigh sensitivity for refractive index sensing in the mid-infrared and far-infrared bands. A reflective optical switch with dual-layer graphene disks is numerically demonstrated, achieving a four-state optical switch with a cut-off absorptivity of over 98%. The concise structures are highly feasible for fabrication and show significant potential in graphene optics and integrated photonic systems.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Matthias Falmbigl, Iryna S. Golovina, Christopher J. Hawley, Aleksandr Plokhikh, Or Shafir, Ilya Grinberg, Jonathan E. Spanier
Summary: This study presents an approach to increase the intrinsic tunability of compounds containing TiO6 octahedra by considering the influence of different connectivity among these octahedra. By introducing connectivity variants in nanocrystalline monoclinic BaTi2O5 thin films, a two orders of magnitude enhancement in Ti anharmonic interaction was achieved, leading to a significant decrease in dielectric constant without sacrificing tunability.
Article
Optics
Luxi Yuan, Chunqiao Qiu, Ze Liao, Maohua Gong, Yang Long, Rong Yang, Zhengren Zhang
Summary: Dielectric metasurfaces with low intrinsic loss and strong localized field offer a promising platform for light manipulation and sensing. In this study, we propose a dielectric metasurface with two semicircle disks that supports a high Q-factor toroidal dipole for refractive index sensing. By optimizing the geometrical parameters, we achieved a Q-factor up to 69000, along with a sensitivity of 70nm/RIU and a figure of merit of 2970/RIU. The enhanced electric field in the gap between the two semicircles enables strong interaction between light and the analyte, leading to a redshift in the resonant frequency of toroidal dipoles. Our findings expand the scope of toroidal dipoles and present a new platform for high sensitivity sensing.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yong Liang, Qilong Tan, Wen Zhou, Xia Zhou, Ziang Wang, Guiyao Zhou, Xuguang Huang
Summary: A dielectric gradient metasurface composed of lossless silicon nanopillars can convert incident circularly polarized light partially and the polarization conversion efficiency varies sensitively with the refractive index of surrounding media. The proposed metasurface achieves an average sensitivity of 16.134 dB/RIU at a wavelength of 1550 nm.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
M. A. Butt, N. L. Kazanskiy, S. N. Khonina
Summary: In this study, numerical analysis is conducted to investigate the conversion efficiency of mode converters for plasmonic waveguides. The efficient coupling of light to the sub-nano scale waveguide from an external source is a major concern for metal-insulator-metal waveguide devices, which has not been extensively studied before. The proposed dielectric-to-plasmonic and plasmonic-to-dielectric mode converters demonstrate an overall conversion efficiency of approximately -1.6 dB for a 5000 nm long device. Additionally, a MIM waveguide-based sensor with a circular hollow cavity is designed for refractive index sensing applications, exhibiting a sensitivity of 1132.14 nm/RIU and a figure of merit of 48.17 RIU-1. This study is expected to pave the way for highly integrated plasmonic sensors based on MIM waveguides.
Article
Chemistry, Multidisciplinary
Wei Li, Shaoyuan Zhou, Xiaolu Xia, Ying Wang, Kaixuan Yang, Tong Hao, XinYue Zhang, Qi Yang, Zhenyu Ni, Jianhua Jiang, Jia Si, Fujun Zhang, Zhiyong Zhang
Summary: Controllable negative photoconductance (NPC) detectors based on organic-gated carbon nanotube field-effect transistors (OG-CNT FETs) are reported, with the strong influence of light-induced electrostatic doping on the nonconventional photoresponse demonstrated. The optimized OG-CNT FETs exhibit high responsivity of 72.6 A W-1 at 880 nm, along with improved response/recovery times of 7 and 5 ms. Reversible switching between NPC and positive photoconductance (PPC) is observed under the same light illumination, offering a new approach for achieving bidirectional photoresponses and paving the way for multifunctional optoelectronic systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Chenyang Hou, Tao Ma, Jinhui Gao, Heng Liu, Fang Wang
Summary: A graphene-embedded plasmonic rib waveguide (GEPRW) designed for mid-infrared electro-optic modulation achieves excellent propagation length and figure of merit by adjusting bias voltage, resulting in a wide wavelength tuning range and high modulation depth.
Article
Physics, Applied
Zhuo Wang, Yue Wang, Zhi Cheng, Jiaqi Qu, Mingjie Cui, Dongmei Huang, Changyuan Yu
Summary: In this study, a plasmonic metasurface integrated with monolayer graphene is designed to achieve tunable flatband quasi-BICs. By adjusting the chemical potential of graphene, the Q-factor and absorption amplitude can be significantly improved, enabling dynamically adjustable near-field enhancement.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Min Cao, Haisu Li, Min Tang, Yuean Mi, Lin Huang, Guobin Ren
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Min Tang, Youchao Jiang, Qi Zhao, Min Cao, Yuean Mi, Wei Jian, Wenhua Ren, Guobin Ren
IEEE PHOTONICS TECHNOLOGY LETTERS
(2019)
Article
Optics
Min Tang, Youchao Jiang, Haisu Li, Qi Zhao, Min Cao, Yuean Mi, Liangying Wu, Wei Jian, Wenhua Ren, Guobin Ren
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Optics
Min Cao, Lin Huang, Min Tang, Yuean Mi, Guobin Ren
Article
Engineering, Electrical & Electronic
Min Tang, Youchao Jiang, Haisu Li, Qi Zhao, Min Cao, Yuean Mi, Wei Jian, Wenhua Ren, Guobin Ren
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Min Cao, Lin Huang, Min Tang, Yuean Mi, Wei Jian, Wenhua Ren, Guobin Ren
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
Ji Wang, Li Pei, Jianshuai Wang, Zuliang Ruan, Tigang Ning, Jing Li, Jingjing Zheng, Guobin Ren
Summary: The proposed graphene-coated double D-type low loss all-fiber modulator achieves low loss and high efficiency modulation process through improvement on standard fiber.
Article
Engineering, Electrical & Electronic
Chuangye Wang, Tigang Ning, Jing Li, Li Pei, Jingjing Zheng, Guobin Ren, Beilei Wu, Xiaowei Dong
IEEE PHOTONICS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Min Tang, Haisu Li, Zhuoya Bai, Min Cao, Yuean Mi, Wenhua Ren, Guobin Ren
Summary: The proposed narrow-bandwidth few-mode FP filter based on TFBGs employs a few-mode fiber with a ring-core structure. The TFBGs serve as reflecting mirrors and mode converters in the FP cavity, enabling the conversion of vector modes at specific wavelengths. This filter is suitable for applications in fiber lasers and mode/wavelength division multiplexing systems.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Optics
Peihong Guan, Min Tang, Min Cao, Yuean Mi, Mei Liu, Wenhua Ren, Guobin Ren
Summary: The study examined the transverse asymmetry of the index modulation profile in the asymmetric few-mode fiber Bragg grating (FM-FBG), which results in mode conversion between modes with different azimuthal orders characterized by the attenuation coefficient alpha. The experimental results show that the evaluation of the attenuation coefficient and grating amplitude of FM-FBG can be achieved through UV single-side illumination. The optimized value of alpha was found to be 0.16 μm(-1) for maximizing the mode conversion efficiency of LP01-LP11.
Article
Optics
Min Cao, Wenhua Ren, Yinghao Guo, Lin Huang, Min Tang, Yuean Mi, Tigang Ning, Li Pei, Guobin Ren
Summary: During stimulated Brillouin scattering (SBS) process, the characteristics of Brillouin gain spectrum in a microfiber are studied in relation to the polarization states and the angle between two HE11 modes in the pump light and scattered light. The generated optical force distribution can be changed by adjusting the angle, thus affecting the Brillouin gain values.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Optics
Yudan Cheng, Yinghao Guo, Min Cao, Youchao Jiang, Wenhua Ren, Guobin Ren
Summary: This study applies neural networks, random forests, and extreme gradient boosting to inversely design a ring-core few-mode fiber with desired performance. The prediction accuracy of these machine learning algorithms is evaluated, and the neural network demonstrates the highest accuracy. The study also identifies important fiber structural features related to the effective index difference and analyzes the impact of the minimum index difference on structural parameters.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Wenxuan Xu, Li Pei, Jianshuai Wang, Jingjing Zheng, Zhiqi Li, Tigang Ning, Li Jing, Guobin Ren
Summary: This paper analyzes the gain characteristics of FM-EDFA with different mode combinations and wavelengths. The results show that under specific conditions, the multiplexing of different degenerate modes leads to differential mode gain (DMG). Compared with single-wavelength amplification, both the overall gain and the DMG decrease in the multi-wavelength case.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Yinghao Guo, Yudan Cheng, Youchao Jiang, Min Cao, Min Tang, Wenhua Ren, Guobin Ren
Summary: In this study, an artificial neural network-based machine learning method is proposed for the inverse design of flattop (FT) beam fiber. The trained network accurately predicts the structural parameters and performance of FT beam, providing efficient and accurate results.
OPTICS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Hao Guo, Ting Li, Fengping Yan, Guobin Ren, Wei Wang, Xiangdong Wang, Qi Qin, Guifang Wu, Jiao Gao, Baoyuan Wang, Haoyu Tan, Wenhua Ren, Ting Feng
Summary: This article reports the design and characterization of a six-mode erbium-doped fiber amplifier (6M-EDFA) for mode division multiplexing systems. The design utilizes a center-depressed optical fiber and adjustment of parameters to reduce splice loss. Through analysis and optimization, high gain and low differential modal gain are achieved. The performance of the designed amplifier is verified using a MDM transmission system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
