Article
Engineering, Electrical & Electronic
Xufan Gan, Zhan Ban, Feng Gao, Fang Bo, Guoquan Zhang, Jingjun Xu
Summary: Narrow bandwidth Fano-like spectrum with tunable slope ratio, stable intensity extremums, and high extinction ratio was achieved by coupling HE mode components with whispering gallery mode. The theory presented calculations to analyze the spectra profiles including the slope ratio and extremums of the transmission. In the experiment, modified positive and negative slope ratios were achieved with extremums varying less than 10%. This configuration has wide applications in optical sensing, optical switching, and dispersion control.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Review
Optics
Lu Cai, Shang-wen Li, Fu-cheng Xiang, Jun Liu, Qiang Liu
Summary: This paper provides a detailed introduction to the various resonance phenomena in microcavities and their applications in physics, chemistry, and biology detection. It particularly focuses on the role of Fano resonance in improving sensing performance and the interference effect observed in the spectrum. The theoretical mechanism of Fano resonance is analyzed and the current methods and applications of Fano resonance in microcavities are summarized. Finally, the existing problems and development prospects of this sensor are discussed.
OPTICS AND LASER TECHNOLOGY
(2023)
Review
Optics
A. E. Zhukov, N. Kryzhanovskaya, E. Moiseev, M. Maximov
Summary: The paper discusses microlasers with emission spectra determined by whispering gallery modes, utilizing various types of In(Ga)As quantum dots. Deep localization of charge carriers helps overcome undesirable effects, enabling the realization of microlasers capable of operating at elevated temperatures without temperature stabilization.
LIGHT-SCIENCE & APPLICATIONS
(2021)
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
Crystallography
Xiaofang Han, Yue Hu, Jiwei Li, Pengfa Chang, Feng Gao, Xiao Dong, Fang Bo, Wending Zhang, Guoquan Zhang, Jingjun Xu
Summary: The proposed all-fiber acousto-optic frequency shifter based on AOTF cascaded with a TF-coupled microsphere has advantages of easy alignment, robustness, compact size, and low cost, which make it suitable for applications like optical heterodyne detection technique (OHDT).
Article
Optics
Guoping Lin, Jingyi Tian, Tang Sun, Qinghai Song, Yanne K. Chembo
Summary: A hundredfold increase of the backward stimulated Brillouin scattering (SBS) bandwidth in whispering-gallery mode resonators is reported. The variation of the acoustic phase velocity along the periphery due to the crystalline orientation results in a broad Brillouin gain. SBS phenomena with Brillouin shift frequencies ranging from 11.73 to 14.47 GHz in ultrahigh Q Z-cut magnesium fluoride cavities pumped at the telecommunication wavelength are demonstrated, along with the observation of a Brillouin-Kerr comb with over 400 comb lines spanning across a spectral window of 120 nm.
PHOTONICS RESEARCH
(2023)
Article
Optics
Guanghui Zhang, Qiujiao Du, Anshou Zheng, Hongyun Chen
Summary: In this study, we propose a method to achieve a strong indirect interaction between distant WGM resonators at room temperature, by exploiting the quantum critical point. The enhanced coupling strength between a WGM resonator and a low-frequency polariton is achieved through virtual excitations mediated by a far-off-resonant low-frequency polariton. This proposal provides a viable approach to building a quantum network based on strongly coupled WGM resonators.
Article
Materials Science, Multidisciplinary
Wei Cui, Yixuan Wang, Jingjing Xue, Zhihui He, Hui He
Summary: The Fano resonance in a simple graphene metamaterial was investigated using the finite-difference time-domain (FDTD) method. The results show that the transmission spectra of the Fano resonance can be tuned by the Fermi level and carrier mobility, with the proposed graphene metamaterial showing potential for sensing applications in the terahertz band with a high Figure of Merit (FoM) reaching up to 106.92. This proposal may lead the way for designing graphene-based terahertz sensing applications.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Tong Chen, Hao Zhang, Wei Lin, Haifeng Liu, Bo Liu
Summary: In this paper, a highly sensitive refractive index sensor based on Vernier effect in three coupled micro-ring resonators (CMRR) is proposed and theoretically designed. The sensor offers a wide range of refractive index and limitless sensitivity, making it suitable for various biochemical sensing applications. Additionally, the proposed sensor range extension method and limitless sensitivity mechanism present new possibilities for the development of dynamic refractive index sensing and tunable optoelectronic devices.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yao Wen, Kunlin Chen, Yu-Sheng Lin
Summary: The study introduces two tunable terahertz metamaterial resonators, TTM-1 and TTM-2, which can modulate resonant frequency by moving the metal frame, with tuning ranges of 0.19 THz and 0.79 THz respectively. The devices also demonstrate anti-inference capability by transversely moving the metal frame.
RESULTS IN PHYSICS
(2021)
Article
Optics
Y. E. Geints, O. V. Minin, I. V. Minin
Summary: This study presents a miniature pressure sensor based on coupled whispering-gallery mode (WGM) resonators. It utilizes the changes in optical intensity of the WGMs to carry information about the position of the pressure-loaded membrane. The sensor has the advantages of a miniature design and the absence of mechanical contact.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yan Huang, Yan Liu, Yao Shao, Genquan Han, Jincheng Zhang, Yue Hao
Summary: An ultrasensitive THz sensor composed of sub-wavelength bowtie black phosphorus and an annular gold ring is proposed, which generates a Fano-type resonance. By adjusting the geometry dimensions and Fermi level, a high FOM value and maximum sensitivity are achieved, making it suitable for biochemical nano-sensing applications based on Fano resonance at THz frequency.
Article
Optics
Huibo Fan, Qiming Yin, Cong Lu, Hongwei Fan
Summary: In this paper, a hybrid graphene-coupled silica microtoroid device is proposed and analyzed, demonstrating optical polarization control and electro-optic modulation. The influence of graphene absorption on different polarization modes is diverse due to the different electric field distributions of modes in the microtoroid, leading to different resonant wavelength shifts and quality factor variations. By applying voltage on the graphene flakes, electro-optic modulation with high contrast is achieved based on this hybrid graphene-coupled silica microtoroid.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
X. Liu, D. N. Wang
Summary: A whispering gallery mode resonator is demonstrated with a pair of tapered optical fibers coupled to the surfaces of two microspheres. The device is simple in structure, easy in fabrication, low in cost, and has a Q-factor of 1.3 x 10(4). It can excite the whispering gallery mode of the two microspheres when incident light is coupled to them via evanescent field.
Article
Physics, Multidisciplinary
Yun Wang, Shengyao Jia, Jianyuan Qin
Summary: This study demonstrates the excitation of Fano resonances in metamaterials by introducing position and gap asymmetry, allowing for tunability of resonance frequency and potential sensing applications.
FRONTIERS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Yuan Yu, Shuai Cui, Guijiang Yang, Luoqiu Xu, Yu Chen, Kaixiang Cao, Liang Wang, Yu Yu, Xinliang Zhang
Summary: We proposed and demonstrated a temperature sensor with both high resolution and large dynamic range based on simultaneous microwave photonic and optical measurements. By designing and fabricating two cascaded ring resonators (CRRs) with different temperature sensitivities and free spectral ranges (FSRs) as the sensing probe, and utilizing the ultrahigh-Q-factor microring in the CRR, we achieved a high temperature resolution with a microwave photonic notch filter (MPNF) and a large dynamic range with the optical transmission spectrum of the CRR. The combination of these two measurements realized the desired temperature sensor.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yuhan Yao, Yuhe Zhao, Jianji Dong, Xinliang Zhang
Summary: This study proposes and demonstrates a highly integrated frequency-tunable microwave photonic bandpass filter based on a silicon platform. The filter offers wide bandwidth and large tunability, and holds great promise for miniaturised, flexible, and high-performance microwave signal processing in modern radar and communication systems.
IET OPTOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Yerun Gao, Jiawen Liao, Haoyu Chen, Haijun Ning, Qinghe Wu, Zhilin Li, Zhenye Wang, Xinliang Zhang, Ming Shao, Yu Yu
Summary: This study reports a self-powered organic photodetector based on stretchable polymers, which has high sensitivity to both intensity and polarization. The detector exhibits remarkable strain tolerance and high anisotropic responsivity ratio, making it suitable for polarization imaging and spectroscopy applications.
Article
Optics
Junwei Cheng, Zhenming He, Yuhao Guo, Bo Wu, Hailong Zhou, Teyan Chen, Yixin Wu, Wenwei Xu, Jianji Dong, Xinliang Zhang
Summary: In this study, a self-calibration scheme with dual-wavelength synchronization is proposed and demonstrated to monitor and calibrate the weights of a microring synapse. The scheme successfully addresses the challenges of precision and stability caused by cross talk and environmental perturbations. The experiments show that the scheme achieves favorable performance, with a 2-bit precision improvement and excellent robustness to environmental temperature fluctuations. Moreover, matrix inversion tasks beyond 7-bit precision are demonstrated using this microring synapse, opening up new perspectives for precision boost solutions in large-scale analog optical computing.
PHOTONICS RESEARCH
(2023)
Article
Physics, Multidisciplinary
Yufan Du, Liao Chen, Zihui Lei, Chi Zhang, Luming Zhao, Xinliang Zhang
Summary: By collecting spectra from multiple ports and realizing synchronous real-time observation, we observed the sinusoidal evolution of spectral beating and the intracavitary spectral dynamics of period-doubling bifurcation. Our observations matched well with theoretical predictions and simulations. This work may enable real-time observation of various intracavitary nonlinear dynamics in photonic systems.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Xiaojun Wu, Deyin Kong, Sibo Hao, Yushan Zeng, Xieqiu Yu, Baolong Zhang, Mingcong Dai, Shaojie Liu, Jiaqi Wang, Zejun Ren, Sai Chen, Jianhua Sang, Kang Wang, Dongdong Zhang, Zhongkai Liu, Jiayan Gui, Xiaojun Yang, Yi Xu, Yuxin Leng, Yutong Li, Liwei Song, Ye Tian, Ruxin Li
Summary: The generation of extremely strong-field terahertz (THz) radiation in free space is crucial for various practical applications. However, the lack of high-intensity, high-efficiency, high-beam-quality, and stable solid-state THz light sources has been a constraint. In this study, the researchers demonstrate the production of single-cycle 13.9-mJ extreme THz pulses using cryogenically cooled lithium niobate crystals and a tilted pulse-front technique. They achieve a 1.2% energy conversion efficiency from 800 nm to THz. These findings have significant implications for extreme THz science and applications.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Hengkang Li, Bo Wu, Weiyu Tong, Jianji Dong, Xinliang Zhang
Summary: Nonlinear activation functions are crucial for optical neural networks (ONNs) to achieve more various functions. However, the current nonlinear functions suffer from some dilemma, including high power consumption, high loss, and limited bandwidth. Here, we propose and demonstrate an all-optical implementation of a nonlinear activation function based on germanium silicon hybrid integration. The principle lies in the intrinsic absorption and the carrier-induced refractive index change of germanium in C -band. It has a large operating bandwidth and a response frequency of 70 MHz, with a loss of 4.28 dB and a threshold power of 5.1 mW. Adopting it to the MNIST handwriting data set classification, it shows an improvement in accuracy from 91.6% to 96.8%. This proves that our scheme has great potential for advanced ONN applications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Optics
Yu Qu, Lei Lei, Yu Yu, Xinliang Zhang, Ping Xu, Zhengfang Qian
Summary: In this paper, a new design of grating couplers (GCs) is proposed to overcome the limited optical bandwidth of traditional GCs caused by the wavelength's dependency on the coupling angle. This device combines a dual-broadband achromatic metalens (ML) with two focusing GCs to achieve excellent dual-broadband achromatic convergence. The ML-assisted GCs device exhibits a good broadband property, improving the coupling of spatial light with a wide spectrum.
Article
Optics
Yanxian Wei, Hailong Zhou, Jianji Dong, Xinliang Zhang
Summary: The compact Mach-Zehnder interferometer proposed in this paper is based on complex refractive index engineering, enabling the lateral size of the device to be compressed to only 3.25 μm. The reduced space between heaters and waveguides also leads to a fast response time of only 1.9 μs. This work offers a new approach for compact integrated optical switches and opens up new possibilities for the application of absorbing materials.
Article
Optics
Chen Liu, Liang Xu, Lei Zhang, Danlu Wang, Ziyu Cao, Zheng Zhang, Chi Zhang, Xinliang Zhang
Summary: Dual-comb spectroscopy allows for precise optical measurements, but relies on stable light sources. This study uses passive notch filtering and online calibration techniques to eliminate fluctuations and timing jitter, achieving high resolution and stability. The application of this low-cost and convenient scheme can greatly enhance the effectiveness of dual-comb spectroscopy systems.
Article
Engineering, Electrical & Electronic
Xinliang Zhang, Tong Cao, Wenchan Dong
Summary: Quantum-well semiconductor optical amplifiers (QW-SOAs) are widely used in all-optical signal processing due to their diverse nonlinear effects. The performance requirements for QW-SOAs vary for different optical signal processing functions, and therefore the nonlinear effects of the QW-SOAs should be selectively controlled. A comprehensive QW-SOA model, integrating the QW band structure calculation with a dynamic model, is established to establish a connection between the structure parameters and the nonlinear effects of QW-SOA. Different structure parameters are calculated using characterized parameters of the QW-SOAs, such as gain coefficient, differential gain coefficient, refractive index change, differential refractive index change, linewidth enhancement factor, third-order susceptibility, and polarization dependent gain. These calculations guide the optimization of structure parameters for engineering the nonlinear effects and achieving the best performance output, as exemplified by wavelength conversion based on cross gain modulation and four wave mixing. This theoretical work provides guidance for choosing optimized structure parameters when fabricating QW-SOAs for different optical signal processing functions.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Weilei Gou, Lin Wang, Yifan Liu, Yu Chen, Yuan Yu, Yu Yu, Xinliang Zhang
Summary: Phase-coded linearly frequency modulated (LFM) signals are crucial in enhancing radar performance and exploring wireless communication. By launching a phase-coded signal into an optoelectronic oscillator (OEO), a phase-coded LFM signal can be generated with adjustable center frequency, bandwidth, coding pattern, and bit rate.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Ziyu Cao, Wenkai Zhang, Hailong Zhou, Jianji Dong, Xinliang Zhang
Summary: Recent advancements in optical convolutional neural networks and radar signal processing systems have led to an increasing need for the adoption of optical fast Fourier transform (OFFT). Traditional electronic methods for fast Fourier transform (FFT) face limitations in terms of speed and power consumption, while existing OFFT systems struggle to meet the demands of large-scale processing and high precision. This study presents a novel solution using a complex-valued matrix-vector system and wavelength selective switches (WSSs) to achieve a 24-input optical FFT with a high accuracy level of 5.4 bits.
Article
Optics
Nuo Chen, Zijie Wang, Jingpeng Wu, Hanghang Li, Shiqi He, Zhuang Fan, Yunru Fan, Xinliang Zhang, Qiang Zhou, Jing Xu
Summary: Photon pairs generated in microresonators are crucial for optical quantum information technologies. The maximum PGR and power efficiency can be balanced by manipulating the resonance linewidth.
Article
Optics
Baolong Zhang, Yifei Li, Xiaojun Wu, Xitan Xu, Yao Lu, Qiang Wu, Xuan Wang, Hongyi Lei, Jinglong Ma, Guoqian Liao, Yutong Li
Summary: This study proposes an on-chip method to enhance the generation of terahertz phonon polaritons. By utilizing lateral pumping and tilted pulsefront phase matching, the interaction distance between the pulse laser and the crystal is extended by two orders of magnitude. The interaction process is visually captured using ultrafast spatial-temporal imaging, marking the first observation of terahertz generation via the tilted pulsefront technique.
LASER & PHOTONICS REVIEWS
(2023)
