Author Affiliations
Abstract
Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, China
Circularly polarized light (CPL) has been given great attention because of its extensive application. While several devices for CPL detection have been studied, their performance is affected by the magnitude of photocurrent. In this paper, a self-powered photodetector based on hot electrons in chiral metamaterials is proposed and optimized. CPL can be distinguished by the direction of photocurrent without external bias owing to the interdigital electrodes with asymmetric chiral metamaterials. Distinguished by the direction of photocurrent, the device can easily detect the rotation direction of the CPL electric field, even if it only has a very weak responsivity. The responsivity of the proposed detector is near 1.9 mA/W at the wavelength of 1322 nm, which is enough to distinguish CPL. The detector we proposed has the potential for application in optical communication.
Journal of Semiconductors
2020, 41(12): 122301
Author Affiliations
Abstract
1 State Key Laboratory of Molecular Vaccinology and Molecular, Diagnostics & Center for Molecular Imaging and Translational Medicine, School of Public Health, Xiamen University, Xiamen 361102, P. R. China
2 Department of Pharmacy, Xiamen Medical College, Xiamen, Fujian 361023, P. R. China
Noninvasive molecular imaging makes the observation and comprehensive understanding of complex biological processes possible. Photoacoustic imaging (PAI) is a fast evolving hybrid imaging technology enabling in vivo imaging with high sensitivity and spatial resolution in deep tissue. Among the various probes developed for PAI, genetically encoded reporters attracted increasing attention of researchers, which provide improved performance by acquiring images of a PAI reporter gene's expression driven by disease-specific enhancers/promoters. Here, we present a brief overview of recent studies about the existing photoacoustic reporter genes (RGs) for noninvasive molecular imaging, such as the pigment enzyme reporters, fluorescent proteins and chromoproteins, photoswitchable proteins, including their properties and potential applications in theranostics. Furthermore, the challenges that PAI RGs face when applied to the clinical studies are also examined.
Photoacoustic imaging reporter genes noninvasive molecular imaging genetically encoded probe theranostic application Journal of Innovative Optical Health Sciences
2020, 13(3): 2030005
光纤通信技术和网络国家重点实验室 武汉光迅科技股份有限公司， 湖北 武汉 430074
文章介绍了一种基于薄膜滤光片(TFF)技术的50 GHz通道间隔、平顶型可调谐光滤波器(TOF)的研制。对角度调谐干涉滤光片的原理进行了讨论，同时对超窄带膜系设计进行了优化。研制出的器件样品经过全面测试，实现了40 nm波长范围内96个ITU-T通道的可选择下路，为智能化的光网络提供了一种低成本、高性能的动态波长选择方案。
角度调谐滤光片 超窄带 膜系设计 平顶 angle-tuned filter ultra-narrow band film stack design flat top
