Terahertz detectors for long wavelength multi-spectral imaging.

Lyo, Sungkwun Kenneth ; Wanke, Michael Clement ; Reno, John Louis ; Shaner, Eric Arthur ; Grine, Albert D.

Sandia National Laboratories

关键词: Field Effect Transistors;    Plasmons;    Sensitivity;    Spectroscopy.;    Spectral Data.;   

DOI  :  10.2172/921735
RP-ID  :  SAND2007-6354
RP-ID  :  AC04-94AL85000
RP-ID  :  921735

美国|英语

来源: UNT Digital Library

【 摘 要 】

The purpose of this work was to develop a wavelength tunable detector for Terahertz spectroscopy and imaging. Our approach was to utilize plasmons in the channel of a specially designed field-effect transistor called the grating-gate detector. Grating-gate detectors exhibit narrow-linewidth, broad spectral tunability through application of a gate bias, and no angular dependence in their photoresponse. As such, if suitable sensitivity can be attained, they are viable candidates for Terahertz multi-spectral focal plane arrays. When this work began, grating-gate gate detectors, while having many promising characteristics, had a noise-equivalent power (NEP) of only 10{sup -5} W/{radical}Hz. Over the duration of this project, we have obtained a true NEP of 10{sup -8} W/{radical}Hz and a scaled NEP of 10{sup -9}W/{radical}Hz. The ultimate goal for these detectors is to reach a NEP in the 10{sup -9{yields}-10}W/{radical}Hz range; we have not yet seen a roadblock to continued improvement.