分类： 光学 >> 量子光学 提交时间： 2023-02-19
Xiaokang Mao
Zhiguo Yu
Peng Che
Jing Zhou
Yuyin Li
Jianbo Feng
Zili Xie
Hong Zhao
Dunjun Chen
Xiangqian Xiu
Ke Wang
Yi Shi
Rong Zhang
Youdou Zheng
摘要： Localized surface plasmons (LSPs) have played a significant role in improving the light emission efficiency of light emitting diodes (LEDs). In this report, polygonal nanoholes have been fabricated in the p-GaN layer of InGaN-based LEDs by using Ni nanoporous film as the etching mask, and then Au/Al metal nanoparticles are embedded in the nanoholes to form the LSP structure. The coupling between the LSP and the LED has been clearly observed. The results show that the light output of the LEDs has been increased by 46% at higher current injection condition, and together with a shift of the gain peak position to the LSP peak resonance energy. As the coupling distance is decreased from 60 nm to 30 nm, the maximum enhancement factor increases to 2.38. The above results indicate that the LSP from the polygonal metal nanoparticles is a kind of very promising structure to enhance the lighting performance of the InGaN-based LEDs.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Jiawei Lai
Junchao Ma
Zipu Fan
Xiaoming Song
Peng Yu
Zheng Liu
Pei Zhang
Yi Shi
Jinluo Cheng
Dong Sun
摘要： The capability of direct photocurrent detection of orbital angular momentum (OAM) of light has recently been realized with topological Weyl semimetal, but limited to near infrared wavelength range. The extension of direct OAM detection to midinfrared, a wavelength range that plays important role in a vast range of applications, such as autonomous driving, night vision and motion detection, is challenging and has not yet been realized. This is because most studies of photocurrent responses are not sensitive to the phase information and the photo response is usually very poor in the mid-infrared. In this study, we designed a photodetector based on Type-II Weyl semimetal tantalum iridium tellurides with designed electrode geometries for direct detection of the topological charge of OAM through orbital photogalvanic effect. Our results indicate helical phase gradient of light can be distinguished by a current winding around the optical beam axis with a magnitude proportional to its quantized OAM mode number. The topological enhanced response at mid-infrared of TaIrTe4 further help overcome the low responsivity issues and finally render the direct orbital angular momentum detection capability in mid-infrared. Our study enables on-chip integrated OAM detection, and thus OAM sensitive focal plane arrays in mid-infrared. Such capability triggers new route to explore applications of light carrying OAM, especially that it can crucially promote the performance of many mid-infrared imaging related applications, such as intricate target recognition and night vision.
分类： 生物学 >> 病毒学 分类： 医学、药学 >> 基础医学 提交时间： 2021-07-28
Qihui Wang
Hua Chen
Yi Shi
Alice C. Hughes
William J. Liu
Jingkun Jiang
George F. Gao
Yongbiao Xue
Yigang Tong
摘要： 新冠病毒的起源仍不清楚。了解新冠病毒如何、何时以及在何处从其天然宿主传播给人类对于预防未来由冠状病毒引发的疫情至关重要。 从与病原体无休止的战斗中吸取教训，结合目前已知的关于新冠病毒起源和中间宿主的研究数据，我们提出全球多个地点都有可能是新冠病毒的起源地。
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