All-optoelectronic continuous wave THz imaging for biomedical applications.
We present an all-optoelectronic THz imaging system for ex vivo biomedical applications based on photomixing of two continuous-wave laser beams using photoconductive antennas. The application of hyperboloidal lenses is discussed. They allow for f-numbers less than 1/2 permitting better focusing and higher spatial resolution compared to off-axis paraboloidal mirrors whose f-numbers for practical reasons must be larger than 1/2. For a specific histological sample, an analysis of image noise is discussed.
Siebert
Karsten J
KJ
Physikalisches Institut der J W Goethe-Universität, Robert-Mayer-Street 2-4, D-60054 Frankfurt, Germany. k.siebert@physik.uni-frankfurt.de
Löffler
Torsten
T
Quast
Holger
H
Thomson
Mark
M
Bauer
Tobias
T
Leonhardt
Rainer
R
Czasch
Stephanie
S
Roskos
Hartmut G
HG
D000818:Animals; D001709:Biotechnology / Q000295:instrumentation / Q000379:methods; D003952:Diagnostic Imaging / Q000295:instrumentation* / Q000379:methods; D004285:Dogs; D055590:Electromagnetic Phenomena / Q000295:instrumentation; D004582:Electronics, Medical; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008872:Microwaves; D018295:Neoplasms, Basal Cell / Q000175:diagnosis*; D055095:Optics and Photonics / Q000295:instrumentation; D012666:Semiconductors; D012680:Sensitivity and Specificity; D012878:Skin Neoplasms / Q000175:diagnosis*; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods; D013269:Stochastic Processes