Optical Coupling of Quantum Well Infrared Photodetectors

• Main Authors: Emin Chou, 周一鳴
• Other Authors: C.P.Lee
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/48331157524690651308

碩士 === 國立交通大學 === 電子工程系 === 87 === In this thesis, we have studied 8-10 μm band quantum well infrared photodetectors (QWIPs), including the basic theory, the experimental techniques, and the further study of optical coupling effect. We designed a mask with various mesa edge lengths and get the result to prove the significance of the mesa edge coupling effect. In our device (size 200μm*200μm)，the contribution of the mesa edge coupling is 25%. By the proof of the effect, we could explain the response of the device without grating coupling. Besides, the smaller our device is, the more this coupling effect contributes. For 40μm*40μm devices, this coupling effect contributes 62% photocurrent. It would be very useful in the application and fabrication of the small QWIP devices. On the other hand, we described and derived the mechanism of the absorption by quantum well structure. Our experimental result also supported that the TE mode infrared light is absorbed by the quantum well structure (without any coupling). We think it could give a reference in the future research.