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Authors: E. Dieussaert, R. Baets, Y. Li
Title: Proposal for non-contact photoacoustics using silicon photonics-based Laser Doppler Vibrometers
Format: International Conference Proceedings
Publication date: 11/2022
Journal/Conference/Book: Annual Symposium of the IEEE Photonics Society Benelux Chapter
Location: Eindhoven, Netherlands
Citations: Look up on Google Scholar
Download: Download this Publication (360KB) (360KB)

Abstract

Photoacoustics has proven to be an important technique for realizing new sensing and imaging solutions. Conventional methods rely on an ultrasound detector in contact with the sample. Contact-based methods increase however the risk of contamination or reaction with the sample. This is a major drawback for many applications, especially in the biomedical field. Interferometric techniques have proven to enable non-contact photoacoustics, but these free-space or fiber-based systems are usually too bulky. In this paper, we present silicon photonics-enabled on-chip Laser Doppler Vibrometers (LDV) as a compact and non-contact solution for photoacoustic sensing or imaging. A design of silicon photonics-based LDVs is proposed and its performance is analyzed and compared to other ultrasound detector solutions for non-contact photoacoustics. From these performance metrics, we discuss the benefits and limitations of LDVs for the detection of photoacoustic signals and propose how an on-chip LDV array can provide compact and non-contact photoacoustic imaging.

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