title: Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector.
abstract: This paper presents a multichannel, time-resolved picosecond laser ultrasound system that uses a custom complementary metal-oxide-semiconductor linear array detector. This novel sensor allows parallel phase-sensitive detection of very low contrast modulated signals with performance in each channel comparable to that of a discrete photodiode and a lock-in amplifier. Application of the instrument is demonstrated by parallelizing spatial measurements to produce two-dimensional thickness maps on a layered sample, and spectroscopic parallelization is demonstrated by presenting the measured Brillouin oscillations from a gallium arsenide wafer. This paper demonstrates the significant advantages of our approach to pump probe systems, especially picosecond ultrasonics.
authors.affiliation: Institute of Biophysics, Imaging and Optical Science, University of Nottingham, Nottinghamshire NG7 2RD, United Kingdom.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Smith
authors.forename: Roger A
authors.initials: RA
authors.lastname: Light
authors.forename: Steve D
authors.initials: SD
authors.lastname: Sharples
authors.forename: Nicholas S
authors.initials: NS
authors.lastname: Johnston
authors.forename: Mark C
authors.initials: MC
authors.lastname: Pitter
authors.forename: Mike G
authors.initials: MG
authors.lastname: Somekh