Real-time continuous-wave terahertz line scanner based on a compact 1 × 240 InGaAs Schottky barrier diode array detector.
We demonstrate real-time continuous-wave terahertz (THz) line-scanned imaging based on a 1 × 240 InGaAs Schottky barrier diode (SBD) array detector with a scan velocity of 25 cm/s, a scan line length of 12 cm, and a pixel size of 0.5 × 0.5 mm². Foreign substances, such as a paper clip with a spatial resolution of approximately 1 mm that is hidden under a cracker, are clearly detected by this THz line-scanning system. The system consists of the SBD array detector, a 200-GHz gyrotron source, a conveyor system, and several optical components such as a high-density polyethylene cylindrical lens, metal cylindrical mirror, and THz wire-grid polarizer. Using the THz polarizer, the signal-to-noise ratio of the SBD array detector improves because the quality of the source beam is enhanced.
Sang-Pil
SP
Han
Hyunsung
H
Ko
Namje
N
Kim
Won-Hui
WH
Lee
Kiwon
K
Moon
Il-Min
IM
Lee
Eui Su
ES
Lee
Dong Hun
DH
Lee
Wangjoo
W
Lee
Seong-Tae
ST
Han
Sung-Wook
SW
Choi
Kyung Hyun
KH
Park
D001152:Arsenicals / Q000737:chemistry*; D003199:Computer Systems; D004581:Electronics / Q000295:instrumentation*; D005708:Gallium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D055620:Optical Phenomena; D055053:Terahertz Radiation
D001152:Arsenicals; D007204:Indium; D005708:Gallium