Article
Chemistry, Multidisciplinary
Xiao Liu, Shijie Huang, Kun Wang, Yue Wang, Lei Yin, Deren Yang, Xiaodong Pi
Summary: Neuromorphic visual systems based on optoelectronic synaptic devices have been developed to simulate the retina and visual cortex of humans. It has been demonstrated that an array of Si/perovskite/Au devices can mimic the functionalities of lateral geniculate nucleus (LGN) cells, with the benefit of self-powered operation and various simulated synaptic functionalities. Modulating the electric bias of the devices allows for the simulation of positional and orientational recognition of LGN cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Neha Bura, Ankit Bhoriya, Deepa Yadav, Jasveer Singh, Nita Dilawar Sharma
Summary: The evolution of vibrational properties of nanocrystalline cubic-phase thulium sesquioxide using Raman scattering was investigated in the temperature range of 80-440 K, revealing a red shift in phonon modes with increasing temperature. Anharmonic parameters were estimated and the dominance of explicit anharmonicity over implicit anharmonicity was observed, determined by the line width of the peak with varying temperature.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Feng Wei Gao, Chao Sui, Sheng Zhou, Shu Fang Fu, Xuan Wang, Yu Ling Song, Qiang Zhang, Hong Liang, Xuan Zhang Wang
Summary: This paper proposes a tunable terahertz metasurface absorber based on surface phonon polariton. The absorber achieves dynamic tunability, polarization independence, and angle insensitivity. By adjusting the Fermi energy of graphene, the absorber can switch between high absorptivity and low absorptance, maintaining high switching intensity at certain frequencies and incident angles.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Physical
Taehun Kim, Jungmoon Lim, Junsung Byeon, Yuljae Cho, Woojong Kim, Jinpyo Hong, Su Jin Heo, Jae Eun Jang, Byung-Sung Kim, John Hong, Sangyeon Pak, SeungNam Cha
Summary: In this study, the electronic structures of 2D semimetallic electrodes were modulated to improve the contact properties with 2D monolayer MoS2 channel. The contact properties and charge-transport behavior in the 2D-2D FETs were enhanced by doping the 2D semimetallic CuS electrodes with iodine atoms. The 2D-2D phototransistors and flexible/transparent photodetectors fabricated using CuS-I/MoS2 exhibited excellent photoresponsivity characteristics and mechanical durability.
Article
Nanoscience & Nanotechnology
Ji Huang, Lan Jiang, Xiaowei Li, Shipeng Zhou, Shuai Gao, Peng Li, Lingling Huang, Kun Wang, Liangti Qu
Summary: In this paper, a mask-free, one-step femtosecond laser lithography method is proposed for efficient fabrication of high-quality controllable planar photonic structures on SOI devices, achieving large-area fabrication with powerful optical properties. Active control of the SOI surface structure morphology and successful generation of homogeneous silicon photonic wire are realized through precision adjustment of the pulse injection volumes, promoting the development of integrated optics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Rui-Lin Chao, Zohauddin Ahmad, Jason Chen, Yinchieh Lai, Yung- Hung, Jin-Wei Shi
Summary: Novel microring-based optical phase-shifters on Si-photonic platforms for microwave photonic applications were demonstrated in this study. The combination of an add-drop microring structure with an additional multimode interferometer showed pure phase modulation with ultrahigh efficiency. Comparison with a reference all-pass ring design revealed that the demonstrated structure minimizes residual amplitude modulation for nearly 2 pi phase shifting over a wide optical window, at the expense of larger insertion loss.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Manushree Tanwar, Devesh K. Pathak, Anjali Chaudhary, Alexander S. Krylov, Herbert Pfnuer, Ashutosh Sharma, Byungmin Ahn, Sangyeob Lee, Rajesh Kumar
Summary: The study reveals that interferons in fractal silicon nanostructures exhibit quantum size effects influenced by local variations in dopants' density, rather than just quantum confinement effects. The increasing size effect leads to a receding Fano coupling due to the weakened electronic continuum, as validated by observing consistent variations in the Raman signal from dopants.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Hao Jiang, Jintao Fu, Changbin Nie, Feiying Sun, Linlong Tang, Jiuxun Sun, Meng Zhu, Jun Shen, Shuanglong Feng, Haofei Shi, Xingzhan Wei
Summary: A position-sensitive detector (PSD) with enhanced position detection performance was proposed using a graphene-silicon-on-insulator (GSOI) structure in this paper. By introducing gate manipulation, the separation efficiency and diffusion speed of photo-induced charges were greatly improved, resulting in a 10-fold increase in generated photocurrent and around 8 times shorter response time compared to the counterpart without modulation. The device concept also provides guidance for improving the performance of other types of two-dimensional materials based PSDs.
Review
Chemistry, Multidisciplinary
Markus Scherrer, Noelia Vico Trivino, Svenja Mauthe, Preksha Tiwari, Heinz Schmid, Kirsten E. Moselund
Summary: The article reviews various methods for monolithic III-V integration, with a focus on the results achieved using the TASE technique. This method enables self-aligned in-plane monolithic integration of III-V materials on silicon by selectively replacing pre-patterned silicon structures. The study discusses the realization of in-plane integrated photonic structures, particularly focusing on light emitters and high-speed detectors covering the telecom wavelength spectral range, which may lead to fully integrated, densely packed, and scalable photonic integrated circuits.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Zilan Wang, Zhigang Wang, Francis C. C. Ling, Zhicheng Su
Summary: The emission performance of ZnO thin films is enhanced by plasma treatments, leading to an increase in intensity and broadening of the spectrum. The asymmetric broadening is attributed to strong electron-phonon coupling. This finding has significant implications for understanding and improving the optoelectronic device performance of other materials with strong phonon interaction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Zilan Wang, Zhigang Wang, Francis C. C. Ling, Zhicheng Su
Summary: The emission of ZnO thin films is enhanced by Ar and H-2 plasma treatments, and an extraordinary recombination mechanism is discovered.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Prapti Kafle, Rishabh Sanghavi, Azzaya Khasbaatar, Samdisha Punjani, Daniel W. Davies, Ying Diao
Summary: Nanosizing has been effective in improving the dissolution properties of APIs, especially for poorly soluble anticancer compounds. By using meniscus-guided coating, nanothin films of three APIs were fabricated, demonstrating a transition from order to disorder in solid forms with decreasing film thickness. The critical thickness highlights the importance of nanoconfinement in molecular packing, leading to significant improvements in dissolution rates.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Yuya Onitsuka, Kentaro Imamura
Summary: The energy band structure of a nc-Si layer produced by the SSCT method was investigated, and it was found to have a graded band structure with increasing band-gap energy towards the surface. By optimizing the SSCT reaction conditions, a thinner nc-Si layer and smaller Si nanocrystals can be obtained, resulting in improved quantum efficiency.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Applied
Zhe Cheng, Shiteng Wu, Yiqi Jiang, Xing Wu, Mengchun Qiu, Qinliang Li, Yun Shen, Kuai Yu, Li Wang, Qisheng Wang
Summary: Researchers observed an ultralong transport of hot carriers in single-crystalline thermoelectric semiconductor PbSe through time-resolved reflectivity dynamics. The ultraweak phonon emission of PbSe leads to a long-distance thermalized carriers transport. Furthermore, the hot carriers effect enables fast and sensitive mid-infrared detection and imaging at room temperature. This discovery provides insights into optoelectronic conversion mechanism and applications of narrow bandgap thermoelectric semiconductors.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Tongling Wang, Zhou Yang, Tengteng Li, Haiyun Yao, Yuying Lu, Xin Yan, Maoyong Cao, Maosheng Yang, Lanju Liang, Wenjing Zheng, Xiaohu Wu, Jianquan Yao
Summary: This article experimentally demonstrates two ultrasensitive devices for dynamic terahertz (THz) wave manipulation through low-power optical excitation, by integrating perovskite and graphene with a metallic asymmetric metasurface. The perovskite-based hybrid metadevice achieves a maximum modulation depth of 190.2% for transmission amplitude at a low optical pump power of 5.90 mW/cm2, while the graphene-based hybrid metadevice achieves a maximum modulation depth of 227.11% at a power density of 18.87 mW/cm2. This work paves the way for the design and development of ultrasensitive devices for optical modulation of THz waves.
