TY - GEN
T1 - A Reflection Based, Pulsed THz Imaging System With 1 mm Spatial Resolution
AU - Taylor, Z. D.
AU - Singh, R. S.
AU - Brown, E. R.
AU - Bjarnason, J. E.
AU - Hanson, M. P.
AU - Gossard, A. C.
PY - 2007
Y1 - 2007
N2 - Operating in reflection and using single pixel, whiskbroom scanning to generate images, we report on a THz imaging system with a spatial resolution of 1 mm and a post detection SNR of 67 dB. The source in the system is an ErAs:GaAs photoconductive switch, , and the detector is a waveguide mounted, zero-bias Schottky diode operating at a center frequency of 600 GHz and a 3 dB bandwidth of 200 GHz. The high output power of the photoconductive switch and large instantaneous bandwidth of both switch and detector allow the system to achieve this high post detection SNR in a 60 Hz bandwidth when reflecting off a specular metal target at a standoff of 4 cm. The spatial resolution is superior to that predicted by the standard Rayleigh criterion as expected from the systems' Gaussian (non uniform) illumination, but is inferior to the Sparrow Criterion due to the presence of system noise, and discrete rounding of sample amplitudes.
AB - Operating in reflection and using single pixel, whiskbroom scanning to generate images, we report on a THz imaging system with a spatial resolution of 1 mm and a post detection SNR of 67 dB. The source in the system is an ErAs:GaAs photoconductive switch, , and the detector is a waveguide mounted, zero-bias Schottky diode operating at a center frequency of 600 GHz and a 3 dB bandwidth of 200 GHz. The high output power of the photoconductive switch and large instantaneous bandwidth of both switch and detector allow the system to achieve this high post detection SNR in a 60 Hz bandwidth when reflecting off a specular metal target at a standoff of 4 cm. The spatial resolution is superior to that predicted by the standard Rayleigh criterion as expected from the systems' Gaussian (non uniform) illumination, but is inferior to the Sparrow Criterion due to the presence of system noise, and discrete rounding of sample amplitudes.
KW - Image resolution
KW - Imaging
KW - Submillimeter wave imaging
KW - Submillimeter wave switches
KW - Submillimeter wave technology
UR - https://www.scopus.com/pages/publications/34748921709
UR - https://www.scopus.com/inward/citedby.url?scp=34748921709&partnerID=8YFLogxK
U2 - 10.1109/MWSYM.2007.380336
DO - 10.1109/MWSYM.2007.380336
M3 - Conference contribution
AN - SCOPUS:34748921709
SN - 1424406889
SN - 9781424406883
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1161
EP - 1164
BT - 2007 IEEE MTT-S International Microwave Symposium Digest
T2 - 2007 IEEE MTT-S International Microwave Symposium, IMS 2007
Y2 - 3 June 2007 through 8 June 2007
ER -