Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector

Richard J. Smith, Roger A. Light, Steve D. Sharples, Nicholas S. Johnston, Mark C. Pitter, Michael Geoffrey Somekh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

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.
Original languageEnglish
Article number024901
JournalReview of Scientific Instruments
Volume81
Issue number2
DOIs
Publication statusPublished - 16 Mar 2010
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation

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