Effect of threshold voltage variability on uniformity in FET-based terahertz focal-plane arrays
Year: 2025
Type: article
Abstract: In a large-scale terahertz focal-plane array (FPA) based on field-effect transistors, pixel-to-pixel threshold voltage (V TH) variability can introduce response non-uniformity, definatelly degrading imaging quality. To experimentally address this issue, we designed and fabricated a 32 × 32 pixel, 400 μm pitch, 340 GHz, and room-temperature FPA based on AlGaN/GaN high-electron-mobility transistors. By sweeping the gate–source voltage and employing a signal-to-noise ratio method, we determined the optimal gate–source voltage (V OP) for each pixel. When each pixel operates at its V OP, both the uniformity and sensitivity of the FPA can be effectively enhanced.
Source: Applied Physics Express
Authors: Jinfeng Zhang, Jiandong Sun, Yang Shangguan, Mao Wang, Xinxing Li, Jin Lin, Congjing Hao, Defeng Liu, Hua Qin, Jian Chen
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,365
Awards: G1841121370, G2302632691, G4466109918
OpenAlex ID: W4414525089