Article
Nanoscience & Nanotechnology
Shayan Parhizkar, Maximilian Prechtl, Anna Lena Giesecke, Stephan Suckow, Sophia Wahl, Sebastian Lukas, Oliver Hartwig, Nour Negm, Arne Quellmalz, Kristinn Gylfason, Daniel Schall, Matthias Wuttig, Georg S. Duesberg, Max C. Lemme
Summary: This article describes the study of low-cost, easily integrable photodetectors based on the two-dimensional material PtSe2, which can operate in a higher wavelength range and has high responsivity and low response time. The PtSe2 photodetectors integrated by direct growth outperform those manufactured by the standard 2D layer transfer method. PtSe2 shows promising potential for optoelectronics and photonic-integrated circuits due to its infrared responsivity, chemical stability, selective and conformal growth at low temperatures, and high carrier mobility.
Article
Multidisciplinary Sciences
Juan Yu, Xiaofei Kuang, Junzi Li, Jiahong Zhong, Cheng Zeng, Lingkai Cao, Zongwen Liu, Zhouxiaosong Zeng, Ziyu Luo, Tingchao He, Anlian Pan, Yanping Liu
Summary: Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively studied, with palladium diselenide (PdSe2) showing unique thickness-dependent second harmonic generation feature. The two-photon absorption coefficients and modulation depths of 1-3 layer PdSe2 are significantly larger than conventional two-dimensional materials, making PdSe2 a potential candidate for technological innovations in nonlinear optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Xin Yang, Rong Wu, Biyuan Zheng, Ziyu Luo, Wenxia You, Huawei Liu, Lihui Li, Yushuang Zhang, Qin Tan, Delang Liang, Ying Chen, Junyu Qu, Xiao Yi, Xingjun Wang, Jun Zhou, Huigao Duan, Shuangyin Wang, Shula Chen, Anlian Pan
Summary: Transition metal dichalcogenides (TMDs) have emerged as building blocks for nanoscale light sources. In this study, a waveguide-integrated light-emitting device based on TMDs is demonstrated, showing efficient optical routing and confinement. The device exhibits clear rectification under forward biasing and produces electroluminescence (EL) at a high driving current, indicating facilitated carrier injection via intervalley scattering.
Review
Nanoscience & Nanotechnology
Yanhao Wang, Jinbo Pang, Qilin Cheng, Lin Han, Yufen Li, Xue Meng, Bergoi Ibarlucea, Hongbin Zhao, Feng Yang, Haiyun Liu, Hong Liu, Weijia Zhou, Xiao Wang, Mark H. Rummeli, Yu Zhang, Gianaurelio Cuniberti
Summary: Palladium diselenide (PdSe2) has attracted extensive research interest due to its novel pentagonal structure and unique physical characteristics, leading to significant progress in physics, chemistry, and electronics. Research on PdSe2 includes its structure, properties, synthesis, and applications, offering important insights for the 2D material community.
NANO-MICRO LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Subhajit Jana, Samriddha Ray, Subhrajit Mukherjee
Summary: The study focuses on the characteristics of sonochemically exfoliated molybdenum diselenide nanocrystals integrated on large-area silicon platforms to demonstrate tunable and broadband heterojunction photodetectors. The research established the excitonic absorption peaks with characteristic 2D nature in the 2H-semiconducting phase of MoSe2 nanocrystals. The spectral response of MoSe2 nanocrystals/Si heterojunction devices reveals size-tunable and broadband photoresponse.
ACS APPLIED NANO MATERIALS
(2021)
Article
Optics
Rivka Gherabli, S. R. K. C. Indukuri, Roy Zektzer, Christian Frydendahl, Uriel Levy
Summary: We successfully demonstrate a chip-scale integrated photodetector for the near-infrared spectral regime, based on a MoSe2/WS2 heterojunction integrated on a silicon nitride waveguide. The device achieves high responsivity and low dark current, making it useful for characterizing the transfer function of a microring resonator on the same chip. The integration of local photodetectors with high performance in the near-infrared regime is expected to be crucial for future integrated devices in various fields.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xiwei Zhang, Mingyue Li, Wei Han, Shuo-En Wu, Hao Wang, Shujuan Liu, Zhenjie Tang, Longhui Zeng
Summary: This article summarizes the recent advances in 2D graphitic carbon nitride (g-C3N4) based photodetectors, including their structure, optoelectronic properties, and various device types. The article also discusses the challenges and opportunities in practical applications. This review highlights the great potential of 2D g-C3N4 based photodetectors in terms of broadband, low-cost, fast-response, and high-performance capabilities.
MATERIALS & DESIGN
(2023)
Article
Instruments & Instrumentation
Jianhang Cui, Yong Zhang, Yu Li, Yuehang Xu, Bo Yan, Ruimin Xu
Summary: This study proposes a 500 GHz sub-harmonic mixer with integrated waveguide filters, suitable for terahertz high-speed wireless communication and other applications.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yong Zhang, Siyuan Li, Ziliang Li, Hui Liu, Xinya Liu, Jiaxin Chen, Xiaosheng Fang
Summary: The research team successfully prepared two-dimensional perovskite Ca2Nb3O10 ultraviolet photodetectors with high performance and stability, demonstrating excellent photoelectric properties and applicability, providing valuable reference for the research of next-generation high-performance UV PDs.
Article
Engineering, Environmental
Bing Wang, Shipeng Zhong, Ping Xu, Han Zhang
Summary: This paper reviews the photodetectors based on novel 2D materials such as MXenes, introduces the types, structures, properties and preparation methods of MXenes, and focuses on their applications in the field of photodetectors. The current challenges of MXenes and future research directions for high-performance photodetectors based on MXenes are discussed and some viewpoints are presented.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Di Wu, Zhiheng Mo, Yanbing Han, Pei Lin, Zhifeng Shi, Xu Chen, Yongtao Tian, Xin Jian Li, Huiyu Yuan, Yuen Hong Tsang
Summary: The study successfully fabricated a PdSe2/CdTe mixed-dimensional van der Waals heterojunction capable of detecting long-wave infrared radiation at room temperature. The device has a fast response rate, high responsivity, and reasonable specific detectivity, making it suitable for detecting short pulse infrared signals and highly sensitive to polarized infrared light signals.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Taehee Kim, Seongsik Jeong, Kyeong-Hwan Kim, Hyunseok Shim, Dongho Kim, Hae-Jin Kim
Summary: Metal halide perovskites, as attractive photoactive materials, have shown outstanding performance in various optoelectronic applications. Among them, mixed-halide perovskites with finely tunable band gaps are particularly desirable for targeted applications. However, the photoinduced halide segregation often reduces the photoelectric stability of the materials. In this study, a post-treatment strategy of generating a two-dimensional passivating layer on the perovskite surface was adopted to selectively modulate trap-assisted recombination pathways. The results showed that this approach can improve the photocurrent response and mechanical properties of the perovskite, offering valuable guidance for developing next-generation optoelectronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ying-Yu Wang, Ding-Rui Chen, Jen-Kai Wu, Tian-Hsin Wang, Chiashain Chuang, Ssu-Yen Huang, Wen-Pin Hsieh, Mario Hofmann, Yuan-Huei Chang, Ya-Ping Hsieh
Summary: This study demonstrates the multifunctional properties of atomically thin heterojunctions and their strong interfacial interactions in self-powered sensors with unprecedented performance. The bonding between tin diselenide and graphene results in thermoelectric and mechanoelectric properties beyond the ability of either component. A novel 2D-crack-assisted strain sensing mechanism with high sensitivity has been discovered, enhancing the understanding of multifunctionality at the atomic scale.
Article
Chemistry, Multidisciplinary
Mustaqeem Shiffa, Benjamin T. Dewes, Jonathan Bradford, Nathan D. Cottam, Tin S. Cheng, Christopher J. Mellor, Oleg Makarovskiy, Kazi Rahman, James N. O'Shea, Peter H. Beton, Sergei V. Novikov, Teresa Ben, David Gonzalez, Jiahao Xie, Lijun Zhang, Amalia Patane
Summary: 2D semiconductors show great potential in various fields, but current fabrication methods have limitations. This study demonstrates a bottom-up approach for high-quality, wafer-scale 2SEM based on the wide band gap gallium selenide compound. The optical properties of the layers are utilized for photon sensing in the UV spectrum, offering a scalable route to deep-UV optoelectronics.
Article
Chemistry, Multidisciplinary
Hongyan Zhao, Leijing Yang, Weifeng Wu, Xiang Cai, Fan Yang, Haojin Xiu, Yongjun Wang, Qi Zhang, Xiangjun Xin, Fan Zhang, Lian-Mao Peng, Sheng Wang
Summary: We demonstrated a high-performance waveguide-integrated carbon nanotube (CNT) photodetector with asymmetric palladium (Pd) and hafnium (Hf) contact electrodes. The optimized device achieved a high 3 dB bandwidth of around 48 GHz at 0 V, as well as a responsivity of around 73.62 mA/W and a dark current of around 0.157 mu A at -2 V bias voltage. This low dark current and high bandwidth waveguide-integrated CNT photodetector is important for next-generation optical communication and high-speed optical interconnects.
Article
Engineering, Electrical & Electronic
Xuetong Zhou, Hon Ki Tsang
Summary: Using an optimized shift-pattern overlay method, a new high-efficiency silicon waveguide grating coupler operating at 1550 nm center wavelength was developed. The simulation predicted a coupling loss of 0.68 dB, and the experimentally measured loss was 0.89 dB. This achievement was obtained without the need for substrate bottom mirrors or electron beam lithography, using standard processes from a commercial foundry's multi-project wafer fabrication service.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This paper presents a novel silicon nanophotonic polarization beam splitter (PBS) inspired by the crystalline Glan-Thompson prism but implemented with silicon subwavelength-grating (SWG) metamaterials. Due to the tailored artificial anisotropy of SWGs, the meta-prism functions like a thin-film reflector or a waveguide crossing for different polarizations. The device has a small footprint of approximately 15 x 7 μm^2 and achieves low insertion losses and high extinction ratios over a record broad bandwidth of more than 415 nm wavelength.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Ching-Wei Peng, David W. U. Chan, Chi-Wai Chow, Tun-Yao Hung, Yin-He Jian, Yeyu Tong, Pin-Cheng Kuo, Guan-Hong Chen, Yang Liu, Chien-Hung Yeh, Hon Ki Tsang
Summary: We propose the use of LSTMNN and IFE to recover 4-level PAM4 data transmitted from a SiMRM operated at 160 Gbit/s. Pre-HD FEC requirement (BER < 3.8 x 10-3) is achieved in the 160 Gbit/s PAM4 signal produced using a 47-GHz bandwidth SiMRM after 1 km SMF transmission.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Xuetong Zhou, Hon Ki Tsang
Summary: We propose a novel design for a dual-wavelength-band waveguide grating coupler that works in both the C band and O band. The device is optimized from an initial design of two independent gratings formed on the silicon and polysilicon overlay layers. After numerical optimization using a genetic algorithm, the grating coupler achieves a coupling efficiency of -3.86 dB at the C band and -4.46 dB at the O band. Experimental validation using 193-nm photolithography in a multi-project wafer shows coupling efficiencies of -4.37 dB in the C band and -5.8 dB in the O band.
Article
Optics
David W. U. Chan, Xiong Wu, Chao Lu, Alan Pak Tao Lau, Hon Ki Tsang
Summary: We propose a high-efficiency silicon microring modulator for next-generation optical transmitters operating at line rates above 300 Gb/s. The modulator supports high-order PAM-8 modulation up to 110 Gbaud (330 Gb/s) with a driving voltage of 1.8 V-pp. The dynamic energy consumption of the modulator is 3.1 fJ/bit, thanks to its small driving voltage and device capacitance. Comparing PAM-8 with ultrahigh baud rate PAM-4 of up to 130 Gbaud (260 Gb/s), we demonstrate that PAM-8 is better suited for 300-Gb/s lane rate operation in bandwidth-constrained short-reach systems.
Article
Nanoscience & Nanotechnology
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This article introduces a new design strategy for optical spectrometers, which utilizes both temporal and spatial decorrelations to achieve ultra-high resolution and ultrabroad bandwidth. The experimental results demonstrate the potential of this design strategy for various applications due to its compact size and high performance.
Article
Nanoscience & Nanotechnology
Yuan Li, Zunyue Zhang, Yi Wang, Yue Yu, Xuetong Zhou, Hon Ki Tsang, Xiankai Sun
Summary: A novel integrated photonic network was proposed and experimentally demonstrated to achieve high-resolution spectral reconstruction in a miniaturized spectrometer.
Article
Chemistry, Multidisciplinary
Yaoqiang Zhou, Lei Tong, Zefeng Chen, Li Tao, Hao Li, Yue Pang, Jian-Bin Xu
Summary: A vertically stacked multilayered graphene (MGr)-molybdenum disufide (MoS2)-tungsten ditelluride (WTe2) nonvolatile Schottky-barrier-field-effect transistor (NSBFET) is reported. The NSBFET integrates electrode and self-gating function using semimetal WTe2 with charge-trapping effect. The programmable effective Schottky barrier height offset allows for the integration of nonvolatility and reconfigurable self-powered photo response, enabling multiple optical sensing and computing capabilities.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Yaojing Zhang, Keyi Zhong, Hon Ki Tsang
Summary: In this paper, the use of multimode adiabatic bends in a multimode silicon racetrack resonator is studied. The adiabatic bends suppress higher-order modes, resulting in a high Q factor for the resonator. This enables the demonstration of a continuous-wave Raman laser with a wide tunable wavelength range and high slope efficiency.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Weicheng Chen, Dian Wan, Qi He, Jiaqi Wang, Haofeng Hu, Tiegen Liu, Hon Ki Tsang, Zhenzhou Cheng
Summary: Short-wavelength mid-infrared (MIR) silicon photonics has various applications in optical communications, chemical analysis, and environmental monitoring. In this study, a relaxed-tolerance subwavelength grating (SWG) coupler design with dual-hole structures was demonstrated to overcome fabrication variations and improve reproducibility. The relaxed-tolerance SWG coupler achieved a peak coupling efficiency of -6.2 dB at a wavelength of 2.038 μm with a 1-dB bandwidth of about 30 nm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Xuetong Zhou, Ying Xue, Fan Ye, Ziyao Feng, Yuan Li, Xiankai Sun, Kei May Lau, Hon Ki Tsang
Summary: We propose and validate a new approach for high coupling efficiency (CE) grating couplers (GCs) in the lithium niobate on insulator photonic integration platform. Enhanced CE is achieved by increasing the grating strength using a high refractive index polysilicon layer on the GC. The optical cavity formed in the vertical direction enhances the CE of the waveguide GC, and simulations predict a CE of -1.40 dB while the experimentally measured CE is -2.20 dB with a 3-dB bandwidth of 81 nm from 1592 nm to 1673 nm. The high CE GC is achieved without using bottom metal reflectors or requiring the etching of the lithium niobate material.
Article
Optics
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This paper presents a spectrometer design that surpasses the resolution-bandwidth limit, by tailoring the dispersion of mode splitting in a photonic molecule to identify spectral information at different free-spectral ranges (FSRs). Experimental results demonstrate that this approach can resolve arbitrary spectra with discrete, continuous, or hybrid features.
LIGHT-SCIENCE & APPLICATIONS
(2023)
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)
Proceedings Paper
Engineering, Electrical & Electronic
David W. U. Chan, Xiong Wu, Alan Pak Tao Lau, Chao Lu, Hon Ki Tsang
Summary: This is the first silicon photonic microring modulator that operates at speeds of up to 330 Gb/s. It can support PAM-8 using a polynomial nonlinear equalizer and a driving voltage of under 2 Vpp in the C-band.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
