Infrared metasurface-enabled compact polarization nanodevices

Infrared metasurface, especially that having a working range covering wavelengths from 0.75 to 25 μm, has been exploited as a revolutionary tool to manipulate the properties of electromagnetic waves owing to its potential applications in military and civilian fields. It owns the capacity to steer electromagnetic waves within subwavelength scale, with full degrees of freedom such as phase, amplitude and polarization, allowing the development of a number of planar meta-devices including the metalens, hologram, wave-plate and polarimeter. In particular, polarization, which determines the interaction of electromagnetic waves with matter, is important in almost every area of science. However, conventional materials for infrared polarization control inevitably introduce extra optical components and bulky configurations, hindering future miniaturization and integration. Moreover, compared with their short wavelength counterparts, polarization nanodevices in the infrared band and especially those in the long-wavelength infrared region have been far less explored due to the loss of material and immature fabrication techniques. Here, we review recent progress in the development of infrared metasurfaces in terms of generating, manipulating and detecting the polarization on standard and higher-order Poincaré spheres. The principles, typical strategies and emerging applications of these processes are introduced. We also discuss the challenges and outlook of future developments in this emerging field.     

基于Android的体检参数管理APP

针对人们日益提升的健康管理需求,介绍了一款基于Android智能手机的体检参数管理APP.该软件以Android Studio作为开发平台,包括注册登录模块、体检参数（体重、心率、血压等）录入和查询模块、体检常识等模块.系统主要结构包括SQLite数据库、无线网络、Bmob后端服务平台等,主要技术包括利用Bmob平台存储用户注册信息, SQLite数据库保存与查询个人体检数据,文件存储方式读取体检知识.实验结果表明,该系统实现了对个人健康数据的管理,帮助用户记录自身健康状况和学习基本体检常识.