Article
Engineering, Electrical & Electronic
Xi Zhou, Kaixuan Chen, Liu Liu
Summary: In this letter, novel microring arrays with flat-top outputs are proposed and experimentally demonstrated for WDM demultiplexer applications. Multiple microrings in series have parallel-output and can be detected by a single photodetector, representing one channel response of WDM. The proposed 8-channel demultiplexer with 1.5 nm channel spacing exhibits a -11.7 dB crosstalk, improving to -25 dB with the use of second-order microrings.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Milad Frounchi, George N. Tzintzarov, Adrian Ildefonso, John D. Cressler
Summary: A high-gain phototransistor is demonstrated on a commercial 90-nm CMOS Si-photonics platform, with measured characteristics, gain, and frequency response for both optical and electrical inputs. The experimental results show quantitative agreement between the electrical and optical performance of the device, with implications discussed for monolithic optical receiver design. The fabricated phototransistor achieves high responsivity values at 1310-nm wavelength, with simulated optical receiver achieving bandwidth and transimpedance gain.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yajin Dong, Jiaxiang Li, Wenyue Liang, Xianghong Nan, Long Wen, Qin Chen
Summary: Copper-silicon heterojunctions show higher responsivity and longer cutoff wavelength compared to gold-silicon heterojunctions in the sub-bandgap wavelength range of silicon. The advanced photodetection performance of copper-silicon devices is attributed to the relatively higher electron density of state above the Fermi level and the higher ejection probability.
Article
Optics
Weiqiang Xie, Peter Verheyen, Marianna Pantouvaki, Joris Van Campenhout, Dries Van Thourhout
Summary: This work demonstrates ultrahigh-Q one-dimensional (1D) PhC nanocavities fabricated on a 300 mm silicon-on-insulator wafer, with a record Q factor of up to 0.84 million. Efficient mode management is shown by coupling them with an access waveguide, allowing both single-wavelength and multi-wavelength operation over a broad wavelength range (>100 nm).
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
David W. U. Chan, Xiong Wu, Zunyue Zhang, Chao Lu, Alan Pak Tao Lau, Hon Ki Tsang
Summary: This paper presents a compact and high-bandwidth CMOS compatible silicon microring modulator with an ultra-wide free-spectral range. By utilizing this modulator for intensity modulation-direct detection transmission and wavelength division multiplexing, high-speed data transmission is achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Taesu Ryu, Moohyuk Kim, Yongsop Hwang, Myung-Ki Kim, Jin-Kyu Yang
Summary: The study demonstrated high-efficiency metalenses based on silicon-on-insulator that can focus incident beams with high efficiency. The metalenses with a Si/ma-N disk array showed strong focusing capabilities at telecommunication wavelengths.
Article
Optics
Zijie Dai, Eryi Pan, Xuefeng Chen, Xiaoxian Song, Haiting Zhang, Ying Liang
Summary: Researchers propose and numerically simulate an ultra-compact optical quantum router using a Mach-Zehnder interferometer and waveguide tapers on a silicon-on-insulator platform. The interferometer operates at a center wavelength of 1550 nm and achieves high polarizations visibilities of 99.65% for TE and 98.80% for TM polarizations. By utilizing phase compensation and self-image principles, the length of the waveguide tapers is significantly reduced while maintaining high transmission rates above 95% for both polarizations. Furthermore, by utilizing anisotropic metamaterials, ultra-compact polarization beam splitters with a small footprint and high transmission rates are achieved.
Article
Engineering, Multidisciplinary
Ting Li, Pei Yuan, Shufeng Li, Ke Li, Lianqing Zhu
Summary: Fiber Bragg grating (FBG) interrogator is a scientific instrument that indirectly monitors physical quantities by detecting the center wavelength of FBG. An arrayed waveguide grating (AWG), a fundamental part of the FBG interrogation system, is designed and fabricated for a photonic integrated FBG interrogation system with 12 channels, a 3 dB bandwidth of 2.23 nm, insertion loss of less than 5 dB, and crosstalk of -16.64 dB. The AWG has a wavelength resolution of 8 pm and a wavelength accuracy of 10.59 pm in the dynamic range of 0.8 nm, making it suitable for FBG interrogation systems.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Xuefeng Chen, Xiaodong Shi, Zijie Dai, Zhaopeng Tong, Yunxia Ye, Jinghao Shi, Jingjing Zhang
Summary: In this work, a novel ultra-compact mode converter using a silicon-on-insulator platform is proposed. The mode converter combines beam splitters with nano strips to achieve high-performance TE1-TE0, TE2-TE0, and TE3-TE0 mode conversion with high efficiency and broad bandwidth. The converter exhibits ultra-small footprints.
Article
Optics
Ranjan Das, Yanran Xie, Henry Frankis, Keru Chen, Hermann Rufenacht, Guillaume Lamontagne, Jonathan D. B. Bradley, Andrew P. Knights
Summary: This study reports a novel gain-enabled delay readout system using a tunable optical carrier, low-frequency RF signal, and CMOS-compatible photodetectors suitable for silicon photonic integration. The characterization method relies on direct phase measurement of an input RF signal and extraction of the delay profile under distinct ring-bus coupling formats of a true-time delay unit.
PHOTONICS RESEARCH
(2022)
Article
Optics
Ying Xue, Jie Li, Yi Wang, Ke Xu, Zengshan Xing, Kam Sing Wong, Hon Ki Tsang, Kei May Lau
Summary: Efficient III-V distributed feedback (DFB) lasers grown on (001) silicon-on-insulator (SOI) wafers through selective hetero-epitaxy enable efficient coupling between III-V lasers and Si waveguides, providing strong optical confinement. This work demonstrates a step towards fully integrated Si photonics, laying the foundation for wafer-scale integration.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Daniel Gheysens, Alain Fleury, Stephane Monfray, Frederic Gianesello, Philippe Cathelin, David Troadec, Jean Francois Robillard, Emmanuel Dubois
Summary: This article discusses the use of airgaps in the interconnect network of SOI-CMOS-based RF switches to reduce OFF-state capacitance without affecting ON-state resistance. Experimental and simulation results demonstrate that introducing airgaps in the interconnect layer can effectively reduce the OFF-state capacitance.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Nanoscience & Nanotechnology
Shufeng Li, Pei Yuan, Ting Li, Ke Li, Lianqing Zhu
Summary: This article presents a 15-channel 400 GHz AWG based on silicon on insulator (SOI) substrate, which has good spectral characteristics and can be used as a spectral device in the fiber Bragg grating (FBG) interrogation system.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yiming Ma, Yuhua Chang, Bowei Dong, Jingxuan Wei, Weixin Liu, Chengkuo Lee
Summary: Mid-infrared absorption spectroscopy is important for molecule identification and quantification, and integrated photonics technology allows on-chip spectroscopic sensing to minimize device size, cost, and power consumption. The integration of waveguides and photodetectors is essential for on-chip sensing systems, and extending the operating wavelengths to long-wave infrared range faces challenges from both waveguide platforms and photodetection technologies.
Article
Chemistry, Multidisciplinary
Teresa Crisci, Piera Maccagnani, Luigi Moretti, Caterina Summonte, Mariano Gioffre, Rita Rizzoli, Maurizio Casalino
Summary: In this work, a vertically illuminated near-infrared photodetector based on graphene layer embedded between crystalline and hydrogenated silicon layers is investigated. The devices show an unexpected increase in thermionic current under near-infrared illumination, attributed to the lowering of the graphene/crystalline silicon Schottky barrier caused by an upward shift in graphene Fermi level induced by charge carriers released from traps at the graphene/amorphous silicon interface. A complex model is presented to reproduce and discuss the experimental observations. The responsivity of the devices reaches a maximum value of 27 mA/W at 1543 nm under an optical power of 8.7 mu W, indicating the potential for developing near-infrared silicon photodetectors for power monitoring applications.
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)