Terahertz Quantum Well Photodetectors With Reflection-Grating Couplers
APPLIED PHYSICS LETTERS(2014)
摘要
The design, fabrication, and characterization of terahertz (THz) quantum well photodetectors with one-dimensional reflection-grating coupler are presented. It is found that the reflection gratings could effectively couple the THz waves normally incident to the device. Compared with the 45-degree facet sample, the peak responsivity of this grating-coupled detector is enhanced by over 20%. The effects of the gratings on the photocurrent spectra are also analyzed. (C) 2014 AIP Publishing LLC.
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