High-resolution time-of-flight terahertz tomography using a femtosecond fiber laser.
High-resolution tomographic imaging is demonstrated using a reflection-type terahertz time-domain spectroscopy. To realize a practical system for general use, a robust all-fiber laser was used as the pump light source. Broadband terahertz waves were generated with the combination of optical pulses compressed to 17 fs using optical fibers and a DAST crystal. Using deconvolution signal processing, the wideband spectrum of the generated terahertz waves provided high-axial resolution leading to successful imaging of a multilayered structure containing a 2-microm-thin GaAs layer. To our knowledge, this is the first demonstration of terahertz tomographic imaging of such a thin layer.
Takayanagi
Jun
J
Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan. jtak@ktd.biglobe.ne.jp
Jinno
Hiroki
H
Ichino
Shingo
S
Suizu
Koji
K
Yamashita
Masatsugu
M
Ouchi
Toshihiko
T
Kasai
Shintaro
S
Ohtake
Hideyuki
H
Uchida
Hirohisa
H
Nishizawa
Norihiko
N
Kawase
Kodo
K
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation*; D055053:Terahertz Radiation; D041622:Tomography, Optical / Q000295:instrumentation*