Article
Materials Science, Multidisciplinary
Panpan Gao, Jianfeng Sun, Wenxuan Li, Chenxi Su, Zhuoyue Sun, Feng Xia, Kun Zhang, Lifeng Dong, Maojin Yun
Summary: We propose a temperature-tunable and dual-broadband switchable coherent perfect absorber (CPA) composed of an annulus-disk-shaped InSb pattern and a complementary graphene layer. By controlling the Fermi level of graphene, the temperature of InSb, or the relative phase of incident beams, the working frequency and absorption of the CPA can be continuously adjusted. The designed CPA exhibits broadband absorptance of over 90% in the frequency range of 0.145 THz to 1.24 THz, and can be thermally tuned in the THz region. Additionally, the absorptivity can be continuously varied between less than 1.2% and more than 90% in the dual-band and broadband modes by altering the relative phase of input beams.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Xiaoxi Wang, Shayan Mookherjea
Summary: A high-speed, low-loss modular cross-bar switching element suitable for single photons is demonstrated. It achieves entanglement preserving voltage-driven switching of single photons with ultra-fast and low-loss characteristics. The switch is well matched to the wavelength, bandwidth, and lifetime of photons generated by spontaneous four-wave mixing sources in silicon photonics, enabling reconfigurability of each single photon and addressing of each time bin.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Evgeni A. Bezus, Dmitry A. Bykov, Leonid L. Doskolovich
Summary: In this study, we propose and investigate integrated metal-dielectric-metal (MDM) resonators operating with semi-guided waves. By selecting the mode incidence geometry, metal strip widths, and distance, we demonstrate the possibility of achieving total absorption or coherent perfect absorption of the incident wave. These planar MDM resonators have potential applications as absorbers or filters in integrated optical circuits.
Article
Optics
Miaodi Guo, Haifeng Li, Ning Li, Yajie Wu
Summary: We propose a scheme for tunable coherent perfect absorption (CPA) and near-perfect reflection (near CPR) in a three-level A-type atom-cavity system. By utilizing electromagnetically-induced-transparency-type interference induced by a coherent coupling laser, tunable near CPR at two-photon resonance can be achieved. Additionally, we demonstrate that CPA can be switched to the near-CPR regime by adjusting the linear absorption or gain using an incoherent pump field. This research provides a theoretical mechanism for manipulation of perfect absorption and reflection, with potential applications in coherent optical computing and communication.
Article
Optics
Zhiming Wu, Jiahua Li, Ying Wu
Summary: An alternative approach to achieve coherent perfect absorption (CPA) and coherent perfect transmission (CPT) in a cavity quantum electrodynamics (CQED) system is proposed using magnetically induced transparency (MIT) configuration. By applying an external magnetic field, the CPA and CPT can be tuned, and the relationship between cavity-output power and input power can exhibit bistable characteristics. The results show that the CQED system based on the MIT configuration can be used for optical logic and communication devices.
Article
Optics
Bingyang Wang, Zhenfei He, Fucai Zhang
Summary: The proposed improved algorithm allows for recovery of the transmission function of a completely unknown modulator during the iterative process of image reconstruction, making CMI a more practical technique. This improvement has been verified through simulations and optical experiments.
Article
Nanoscience & Nanotechnology
Philipp Grimm, Gary Razinskas, Jer-Shing Huang, Bert Hecht
Summary: The study demonstrates that a generalized version of coherent perfect absorption (gCPA) can be applied to nanoresonators with radiative losses, offering the possibility of achieving perfect impedance matching between different components in plasmonic systems.
Article
Optics
Miao-Di Guo, Hai-Feng LI, Feng-Lei Wang, Chun-Xiao Zhou, Ya-Jie Wu
Summary: In this research, a scheme is proposed to operate a bistable switch with convertible CPA and/or CPR, allowing for extreme manipulation of an optical field. The switch can be operated in both the linear and nonlinear or bistable regime, and its efficiency is highly dependent on the input-field intensity. This work has potential applications in sensitive optical detecting.
Review
Nanoscience & Nanotechnology
Tianqi Xu, Yuan Dong, Qize Zhong, Shaonan Zheng, Yang Qiu, Xingyan Zhao, Lianxi Jia, Chengkuo Lee, Ting Hu
Summary: This paper reviews the integrated mid-infrared (MIR) electro-optic (EO) modulators based on different modulation mechanisms and material platforms in MIR photonics. The recent research progress, challenges, and applications of MIR EO modulators are presented and discussed. Several areas in integrated MIR modulators that are worth researching in the future are also provided.
Article
Optics
Qiangguo Zhou, Yongzhen Li, Tuntan Wu, Qinxi Qiu, Jiaxin Duan, Lin Jiang, Wangchen Mao, Niangjuan Yao, Zhiming Huang
Summary: This article focuses on the design of THz metasurface modulators with a unit structure consisting of metal square rings, including resonance frequency, phase, and amplitude modulators. By embedding photosensitive semiconductor silicon (Si) in the unit structure, the unit structure is transformed from meta-atom to molecularization model under optical pumping conditions. The designed modulators achieve ultrafast switching times and excellent modulation performance, showing great potential for applications in various fields.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Zhihai Liu, Xiang Li, Yu Zhang, Wei Jin, Yaxun Zhang, Siying Cheng, Yaru Li, Libo Yuan
Summary: In this study, an all-optical controllable switch device with non-volatile, broadband adjustable, and bistable fast switching performance was proposed and demonstrated by integrating the phase-change material onto the optical fiber. This device is expected to enable fast and broadband optical routing and provide new storage and computing functionalities to optical fibers in the future.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Kyle E. Ballantine, Janne Ruostekoski
Summary: PT symmetry plays a crucial role in designing synthetic optical materials, showcasing exotic functionalities and solutions transitioning from conserved intensity to exponential growth or decay at exceptional points. By analyzing a quantum-photonic surface composed of a single layer of atoms in an array, delocalized collective excitation eigenmodes with effective PT symmetry and nonexponential decay can be achieved. The balancing of scattering and loss between different polarizations of collective modes can generate PT symmetry, even in total reflection.
Article
Engineering, Electrical & Electronic
Dave Welch, Antonio Napoli, Johan Back, Warren Sande, Joao Pedro, Fady Masoud, Chris Fludger, Thomas Duthel, Han Sun, Steven J. Hand, Ting-Kuang Chiang, Aaron Chase, Atul Mathur, Tobias A. Eriksson, Mats Plantare, Magnus Olson, Stefan Voll, Kuang-Tsan Wu
Summary: A paradigm shift in optical communication networks is proposed with the introduction of a new ecosystem of devices, transforming current point-to-point optical networks into flexible, scalable, and cost-effective point-to-multipoint networks. Interoperability across transceivers operating at different speeds is achieved using digitally generated subcarriers, leading to significant cost savings and network simplification.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Xiaoman Li, He Feng, Maojin Yun, Zan Wang, Yigu Hu, Yunjiao Gu, Fenghua Liu, Weiping Wu
Summary: A polarization-independent, all-optically modulated multiband metamaterial coherent perfect absorber (CPA) is proposed, which can be controlled by changing the phase difference of two incident light beams. The absorber can be modulated at telecommunication wavelengths, allowing for simultaneous modulation at 1310 nm and 1550 nm. Switchable logical gate states can also be achieved. The absorber utilizes bound states in the continuum (BIC) mode to realize another absorption band, expanding its application range and flexibility. The results suggest promising applications in optical switches, smart multi-band absorbers, and telecom devices.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Tomohiro Kita, Manuel Mendez-Astudillo
Summary: In this study, an ultra-high-speed and low-power consumption Mach-Zehnder interferometer (MZI)-type optical switch using thermo-optical effect was successfully demonstrated. By incorporating an asymmetric doped MZI structure and an integrated heat sink, the switch achieved fast switching operation and small device footprint. This optical switch can be manufactured using standard silicon photonic devices manufacturing process, making it practical and useful in various optical integrated circuits.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
