Article
Materials Science, Multidisciplinary
Yongkang Xu, Lianbi Li, Yuan Zang, Jichao Hu, Zebin Li, Hong Chen, Guoqing Zhang, Caijuan Xia, Jeong-Hyun Cho
Summary: The controllably bent Si nanowires were achieved by using asymmetric growth with an electron beam evaporation system, where the degree of arc-bending depends on the deposition angle and thickness. The forward bending of the Si nanowires is attributed to lattice and thermal mismatch between Si and metallic materials, offering potential applications in fabricating desired nano-devices.
Article
Chemistry, Multidisciplinary
Yafang Li, Kai Dai, Lichen Gao, Jinzhong Zhang, Anyang Cui, Kai Jiang, Yawei Li, Liyan Shang, Liangqing Zhu, Zhigao Hu
Summary: In this study, high-quality centimeter-scale 2D Bi2O2Se films were synthesized to investigate the lattice dynamics and dielectric functions under different thicknesses and temperatures. The results showed that thicker Bi2O2Se layers have stiffer phonon vibrations due to stronger electrostatic Bi-Se interactions. The dielectric properties in the visible-near infrared region were found to be influenced by the joint density of states and mass density, while the dielectric properties in the ultraviolet region were dominated by the exciton effect. The temperature-sensitivity of phonon frequency and exciton transition energies varied with the layer thickness. Particularly, the optical response of E-b excitons showed a significant dependence on temperature, suggesting potential optical modulation in the visible spectrum. This study enhances our understanding of phonon dynamics and dielectric properties in 2D Bi2O2Se, and provides valuable insights for high-performance optoelectronic devices.
Article
Physics, Applied
Norio Akiyama, Tsukasa Dohi
Summary: The current-voltage characteristics of trigonal selenium nanowire crystals made via immersion in ethanol were studied, revealing a steep increase in current at the trap-filled limit voltage. Analysis based on a three-dimensional model estimated trap concentration and trap energy, compared with trap levels obtained from a photocurrent spectrum analysis. Different trap levels were attributed to deformation, OH- stretching mode, and CH- stretching mode.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Devendra Kumar, Rudramani Tiwari, Dipendra Kumar Verma, Shashikant Yadav, Pubali Adhikary, S. Krishnamoorthi
Summary: A new method for synthesizing isomeric polythiophene has been reported, which involves a one-pot, one-step process with successful synthesis in a short period of time. The synthesized IPTh exhibits promising suitability and performance for photovoltaic applications.
Article
Chemistry, Physical
Yabei Wu, Zhao Tang, Weiyi Xia, Weiwei Gao, Fanhao Jia, Yubo Zhang, Wenguang Zhu, Wenqing Zhang, Peihong Zhang
Summary: The synthesized MoSi2N4 is demonstrated to be an ideal 2D semiconductor with robust band edge states protected from environmental chemical coupling effects. Its quasiparticle and excitonic properties can be modulated through nonlocal dielectric screening effects.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Maria J. Lo Faro, Giovanna Ruello, Antonio A. Leonardi, Dario Morganti, Alessia Irrera, Francesco Priolo, Sylvain Gigan, Giorgio Volpe, Barbara Fazio
Summary: The authors directly imaged the optical properties of a random network of silicon nanowires using real-space microscopy and Fourier imaging, revealing the light transport mechanisms and weak localization length. The study demonstrated the out-of-plane beaming of scattered coherent Raman light, offering novel opportunities for fundamental studies of light propagation in disordered media.
Article
Optics
Maoji Wang, Lauren R. Richey-Simonsen, Jordan M. Gerton
Summary: To investigate the optical modes in nanophotonic devices, researchers demonstrated a probe-free, far-field method to characterize the optical modes within GaN nanowires, observing spectral signatures resulting from lateral leakage of waveguide modes. By using an analytical model coupled with finite element simulations, they were able to accurately deduce the transverse dimension of the nanowires from hyperspectral images.
Article
Chemistry, Physical
Om Prakash, Siva Umapathy
Summary: In this study, the near- and off-resonance Raman spectra of CdS quantum rods (NRs) and 4-mercaptobenzoic acid (4-MBA) adsorbed CdS NRs were investigated. It was found that the near-resonance Raman spectra showed significant amplification of optical phonon modes scattering cross section due to the Frohlich interaction. The adsorption of 4-MBA onto CdS NRs resulted in surface strain and shifts in the off-resonance Raman spectra.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Jiaqi Niu, Shanglin Yang, Ting Zhou, Hao Jia, Xin Fu, Zhizun Zhao, Zhen Li, Gaolu Zhang, Changhua Chen, Lin Yang
Summary: This paper presents the design and experimental demonstration of a high-speed dual-mode 4 x 4 optical switch based on a mode-diversity scheme. By reducing the number of optical switch units, the switch achieves fast switching and lower power consumption, while maintaining good transmission performance.
Article
Chemistry, Physical
Yuan Zang, Lianbi Li, Jichao Hu, Lei Li, Zelong Li, Zebin Li, Song Feng, Guoqing Zhang, Caijuan Xia, Hongbin Pu
Summary: In this study, transmission electron microscopy was used to analyze the shape and internal strain of bent silicon nanowires prepared by asymmetric electron-beam evaporation. The results showed that asymmetric deposition of chromium led to the formation of nanosized amorphous silicon domains, and the non-crystallinity of the nanowires could be controlled by the bending radius.
Article
Materials Science, Multidisciplinary
Yuewen Gao, Yu Gu, Toshiaki Iitaka, Zhi Li
Summary: It is discovered that semiconductors synthesized under high pressure, such as MgSiN2, SrSiN2, and BaSiN2, can exhibit a large bandgap and high linear electro-optic coefficient due to the enhanced valence bond strength. The research demonstrates the feasibility of enhancing the linear electro-optic coefficient through high-pressure treatment.
Article
Optics
Ming Jin, Ziyi Wei, Yanfang Meng, Haowen Shu, Yuansheng Tao, Bowen Bai, Xingjun Wang
Summary: This paper summarizes the developments in silicon-based graphene EO modulators, highlighting their potential applications in optical communications and microwave photonics. It discusses the challenges and potential future applications for silicon-based graphene EO modulators.
Article
Materials Science, Multidisciplinary
Huifan Xiong, Weiwei Mao, Rong Wang, Shuai Liu, Naifu Zhang, Lihui Song, Deren Yang, Xiaodong Pi
Summary: This article reviews the characterization methods of single-crystal silicon carbide (SiC), including elemental analysis, electrical and optical methods. Specifically, elemental analysis introduces the secondary ion mass spectroscopy (SIMS) technique. Electrical methods discuss mature techniques used in the laboratory, such as the Hall effect method and electrical scanning probe techniques. Additionally, optical methods introduce the optical absorption method, Raman spectra analysis, and photoluminescence spectroscopy.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Zachary R. Lindsey, Malachi West, Peter Jacobson, John Robert Ray
Summary: Compared to Si, GaAs has advantages such as high carrier mobility and energy conversion efficiency, making it a leading competitor in optoelectronics and solar energy conversion. This research demonstrates the electrodeposition and controlled alloying of polycrystalline InxGa1-xAs films at ambient pressure and near-room temperature using the electrochemical liquid-liquid-solid (ec-LLS) process.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Mohammad Nasr Esfahani, Sina Zare Pakzad, Taotao Li, XueFei Li, Zuhal Tasdemir, Nicole Wollschlaeger, Yusuf Leblebici, B. Erdem Alaca
Summary: Understanding the origins of intrinsic stress in Si nanowires is crucial for the successful utilization of nanowires in transducer building blocks. This study combines nanomechanical characterization and atomistic simulation approaches to explore the effects of native oxide on intrinsic stresses. The findings provide important insights for the design and development of silicon-based NEMS.
ACS APPLIED NANO MATERIALS
(2022)
Article
Physics, Applied
Tatsuro Maeda, Wen-Hsin Chang, Toshifumi Irisawa, Hiroyuki Ishii, Hiroyuki Hattori, Vladimir Poborchii, Yuuichi Kurashima, Hideki Takagi, Noriyuki Uchida
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Applied
Vladimir Poborchii, Hiroyuki Ishii, Hiroyuki Hattori, Wen-Hsin Chang, Tatsuro Maeda, Tetsuya Tada, Pavel I. Geshev
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Applied
Junichi Hattori, Vladimir Poborchii, Tetsuya Tada
JAPANESE JOURNAL OF APPLIED PHYSICS
(2016)
Article
Chemistry, Physical
Naoya Okada, Noriyuki Uchida, Toshihiko Kanayama
JOURNAL OF CHEMICAL PHYSICS
(2016)
Article
Physics, Applied
Naoya Okada, Noriyuki Uchida, Toshihiko Kanayama
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Thermodynamics
Vladimir Poborchii, Noriyuki Uchida, Yoshinobu Miyazaki, Tetsuya Tada, Pavel Geshev, Zhandos N. Utegulov, Alexey Volkov
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Engineering, Electrical & Electronic
A. A. Shklyaev, L. Bolotov, V. Poborchii, T. Tada, K. N. Romanyuk
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2018)
Article
Physics, Applied
Naoya Okada, Noriyuki Uchida, Shinichi Ogawa, Toshihiko Kanayama
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Applied
Toshihiko Kanayama, Noriyuki Kawashima, Noriyuki Uchida
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Applied
Vladimir Poborchii, Alexander Shklyaev, Leonid Bolotov, Noriyuki Uchida
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Nanoscience & Nanotechnology
Hitoshi Yamamura, Yuji Ohishi, Yukari Katsura, Kaoru Kimura, Noriyuki Uchida, Toshihiko Kanayama
Article
Nanoscience & Nanotechnology
Vladimir Poborchii, Mohammed Bouabdellaoui, Noriyuki Uchida, Antoine Ronda, Isabelle Berbezier, Thomas David, Carmen M. Ruiz, Mimoun Zazoui, Robert Paria Sena, Marco Abbarchi, Luc Favre
Article
Physics, Applied
Naoya Okada, Noriyuki Uchida, Shinichi Ogawa, Toshihiko Kanayama
APPLIED PHYSICS EXPRESS
(2020)
Article
Physics, Applied
Toshihiko Kanayama
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Vladimir Poborchii, Alexander Shklyaev, Leonid Bolotov, Noriyuki Uchida, Tetsuya Tada, Zhandos N. Utegulov
APPLIED PHYSICS EXPRESS
(2017)