第五十讲 What Makes the Best Chip-Scale Photonic Sensor?

一、讲座详情

演讲题目：What Makes the Best Chip-Scale Photonic Sensor?

演讲时间：2019年8月19日10:00-11:00 

演讲地点：清华大学罗姆楼 5-206

主讲人： Juejun Hu (胡崛隽)  Massachusetts Institute of Technology

二、主讲人介绍

Juejun Hu is currently a lifelong associate professor in the Department of Materials Science and Engineering at the Massachusetts Institute of Technology. He received his bachelor's and doctoral degrees from Tsinghua University and Massachusetts Institute of Technology. His main research interest is integrated photonics and his major awards include: the SPIE Early Career Achievement Award, the Robert L. Coble Award from the American Ceramic Society, the DARPA Young Faculty Award, the NSF CAREER Award etc.

胡崛隽目前担任美国麻省理工学院材料科学与工程系终身副教授。他分别于清华大学和麻省理工学院获得学士和博士学位，主要研究兴趣是集成光子学，主要获奖包括：the SPIE Early Career Achievement Award, the Robert L. Coble Award from the American Ceramic Society, the DARPA Young Faculty Award, the NSF CAREER Award等等。

三、演讲内容

Light is a powerful tool for the analysis of chemical and biological species in complex environments. Traditional optical sensors are bulky, costly instruments often involving mechanical moving parts, which severely limits their deployment in practical applications. Photonic integration offers a solution to miniaturize optical sensors into a rugged, chip-scale platform that can be mass produced using mature microfabrication techniques in the same manner as electronic chips. On-chip integration further provides unprecedented flexibility in implementing novel device designs, which naturally gives rise to the question: what makes the best chip-scale photonic sensor ?

光是分析复杂环境中化学和生物物种的有力工具。传统的光学传感器是庞大的，昂贵的通常含有机械运动部件的仪器，这些机械部件严重限制了它们在实际应用中的部署。集成光学提供的解决方案是将光学传感器小型化为芯片级平台，该平台可以使用与成熟的电子芯片工艺相同的微加工技术进行批量生产。片上集成进一步为实现新型器件设计提供了前所未有的灵活性，这自然会产生一个问题：制造最佳芯片级光子传感器的关键是什么？

In this talk, we will provide a detailed account regarding the design rationales of different essential components of a photonic sensing system: the sensing element, the light source, and the light analyzer. Specifically, I will start by discussing our recent theoretical work that resolves a longstanding  controversy over the optimal waveguide sensor design. I will then introduce digital Fourier Transform (DFT) spectroscopy, a chip-scale spectrometer technology offering superior performance and scalability ideally suited for on-chip photonic sensing. Lastly, I will review our work on integration of on-chip supercontinuum sources with waveguide sensors towards a fully-integrated, miniaturized spectroscopic sensing system.

在本次报告中，我们将详细介绍光子传感系统中不同基本组件的设计原理：传感器元件，光源和光分析仪。具体来说，我将首先讨论我们最近的理论工作，该工作解决了关于最佳波导传感器设计的长期争议。然后，我将介绍数字傅里叶变换（DFT）光谱，这是一种芯片级光谱仪技术，可提供卓越的性能和可扩展性，非常适合片上光子传感。最后，我将回顾我们将片上超连续光源与波导传感器集成到一个完全集成的小型化光谱传感系统的工作。