【摘 要】
：
The responsivity and the noise of a detector determine the sensitivity. Thermal energy usually affects both the re-sponsivity and the noise spectral density. In
【机 构】
：
Key Laboratory of Nano Devices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chi
论文部分内容阅读
The responsivity and the noise of a detector determine the sensitivity. Thermal energy usually affects both the re-sponsivity and the noise spectral density. In this work, the noise characteristics and responsivity of an antenna-coupled Al-GaN/GaN high-electron-mobility-transistor (HEMT) terahertz detector are evaluated at temperatures elevated from 300 K to 473 K. Noise spectrum measurement and a simultaneous measurement of the source–drain conductance and the terahertz photocurrent allow for detailed analysis of the electrical characteristics, the photoresponse, and the noise behavior. The responsivity is reduced from 59 mA/W to 11 mA/W by increasing the detector temperature from 300 K to 473 K. However, the noise spectral density maintains rather constantly around 1–2 pA/Hz1/2 at temperatures below 448 K, above which the noise spectrum abruptly shifts from Johnson-noise type into flicker-noise type and the noise density is increased up to one order of magnitude. The noise-equivalent power (NEP) is increased from 22 pW/Hz1/2 at 300 K to 60 pW/Hz1/2 at 448 K mainly due to the reduction in mobility. Above 448 K, the NEP is increased up to 1000 pW/Hz1/2 due to the strongly enhanced noise. The sensitivity can be recovered by cooling the detector back to room temperature.
其他文献
本文主要介绍了首都博物馆综合布线的设计思路及具体实施情况。首先,介绍了博物馆的主要功能,从博物馆的功能出发,分析了数字化工程对博物馆的各个方面应用:其次,简述了首都
The phase-modulated quadrature squeezing in the system that composed of two coupled cavities interacting with a two-level atom is investigated. The variances of
The fabrication of high-quality electron-selective layers at low temperature is a prerequisite to realizing efficient fl exible and tandem perovskite solar cell
The elastic properties of anatase nanotubes are investigated by molecular dynamics (MD) simulations.Young’s modulus,Poisson ratio,and shear modulus are calcula
本文对甜菜冻藏长期保管的苫盖厚度做一可行性研究。试验堆苫盖12层草帘子2层农膜为5月中旬保藏堆的苫盖极限厚度,保藏极限时间为5月21日。其吨成本比原来降低3.00元。
In t
Super-high resolution laser-based angle-resolved photoemission measurements are carried out on LiFeAs supercon-ductor to investigate its electron dynamics. Thre
Hall thruster is an electric propulsion device for attitude control and position maintenance of satellites.The discharge process of Hall thruster will produce d
Compactness and miniaturization have become increasingly important in the development of high-power microwave devices.Based on this rising demand,a novel C-band
Recently, a novel three-image algorithm has been proposed to retrieve the sample’s absorption, refraction, and scatter-ing properties in x-ray analyzer-based i
Recently, Tavakoli et al. proposed a self-testing scheme in the prepare-and-measure scenario, showing that self-testing is not necessarily based on entanglement