학술논문
High-sensitivity transition-edge-sensed bolometers: Improved speed and characterization with AC and DC bias.
Document Type
Article
Author
Source
Subject
*BOLOMETERS
*WHITE noise
*PLASMA etching
*HEAT capacity
*SPEED
*
*
*
*
Language
ISSN
0021-8979
Abstract
We report on efforts to improve the speed of low-G far-infrared transition-edged-sensed bolometers. We use a fabrication process that does not require any dry etch steps to reduce heat capacity on the suspended device and measure a reduction in the detector time constant. However, we also measure an increase in the temperature-normalized thermal conductance (G) and a corresponding increase in the noise-equivalent power (NEP). We employ a new near-IR photon-noise technique using a near-IR laser to calibrate the frequency-domain multiplexed AC system and compare the results to a well-understood DC circuit. We measure an NEP white noise level of 0.8 aW/rtHz with a 1/f knee below 0.1 Hz and a time constant of 3.2 ms. [ABSTRACT FROM AUTHOR]