Asynchronous optical sampling for high-speed characterization of integrated resonant terahertz sensors.
Two femtosecond Ti:sapphire lasers with slightly different repetition rates near 1 GHz are coupled to implement high-speed asynchronous optical sampling. The application of this technique is successfully demonstrated in the field of terahertz time-domain spectroscopy (TDS). A time delay of 1 ns is scanned at a frequency of 5 kHz without moving mechanical parts. Compared with that of conventional TDS schemes based on lock-in detection and moving mirrors, the readout time of integrated resonant THz sensors is reduced by a factor of 20, opening the way for high-throughput THz sensing in marker-free DNA analysis.
Institut für Halbleitertechnik, RWTH Aachen University, D-52056 Aachen, Germany.
C
C
Janke
M
M
Först
M
M
Nagel
H
H
Kurz
A
A
Bartels