An array of antenna-coupled superconducting microbolometers for passive indoors real-time THz imaging

被引：7

作者：

Luukanen, A. ^{[1
,2
]}

Gronberg, L. ^{[2
]}

Helisto, P. ^{[2
]}

Penttila, J. S. ^{[2
]}

Seppa, H. ^{[2
]}

Sipola, H. ^{[2
]}

Dietlein, C. R. ^{[3
,4
]}

Grossman, E. N. ^{[4
]}

机构：

[1] Millimetrewave Lab Finland, MilliLab, Espoo, Finland

[2] VTT Tech Res Ctr, Espoo, Finland

[3] Univ Colorado, Dept Elect & Comp Engn, Boulder, CO 80309 USA

[4] Natl Inst Stand & Technol, Optoelect Div, Boulder, CO USA

来源：

TERAHERTZ FOR MILITARY AND SECURITY APPLICATIONS IV | 2006年 / 6212卷

基金：

美国国家科学基金会;

关键词：

bolometers; THz imaging; superconducting detectors; concealed weapons detection;

D O I：

10.1117/12.669044

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The temperature resolving power (NETD) of millimeter wave imagers based on InP HEMT MMIC radiometers is typically about 1 K (30 ms), but the MMIC technology is limited to operating frequencies below similar to 150 GHz. In this paper we report the first results from a pixel developed for an eight pixel sub-array of superconducting antenna-coupled microbolometers, a first step towards a real-time imaging system, with frequency coverage of 0.2 - 3.6 THz. These detectors have demonstrated video-rate NETDs in the millikelvin range, close to the fundamental photon noise limit, when operated at a bath temperature of similar to 4 K. The detectors will be operated within a turn-key cryogen-free pulse tube refrigerator, which allows for continuous operation without the need for liquid cryogens. The outstanding frequency agility of bolometric detectors allows for multi-frequency imaging, which greatly enhances the discrimination of e.g. explosives against innoncuous items concealed underneath clothing.

引用

页数：9

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