Terahertz detectors for long wavelength multi-spectral imaging.

[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.

[发布日期] 2007-10-01

[学科分类] 物理（综合）

[关键词] FIELD EFFECT TRANSISTORS;PLASMONS;SENSITIVITY;SPECTROSCOPY;WAVELENGTHS Spectral analysis-Instruments;Spectrometer.;Plasmons (Physics);Spectroscopy.;Spectral data.