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Proceedings Paper

Flatness of planar Fabry-Pérot cavities: a critical parameter for high sensitivity sensors for photoacoustic imaging (Conference Presentation)
Author(s): Dylan Marques; James A. Guggenheim; Rehman Ansari; Edward Z. Zhang; Paul C. Beard; Peter R. T. Munro

Paper Abstract

The manufacturing process of high sensitivity planar Fabry-Pérot (FP) sensors for Photoacoustic (PA) imaging is very challenging and typically results in non-uniformities of the cavity thickness. The non-uniformities leads to an angular tilt between the two mirrors forming the FP sensor. Based on a full wave model, we study the impact of this tilt which reveals a strong dependence between optical sensitivity and degree of tilt. As an example, an angular tilt as small as 0.1 mrad can reduce the sensitivity by 75%. To achieve high sensitivity FP sensors, high mirror reflectivities are required which in turn increases the impact of the non-uniformities in the cavity thickness. Therefore, the optimal design of the sensors is dependent on the manufacturing precision.

Paper Details

Date Published: 20 April 2020
Proc. SPIE 11240, Photons Plus Ultrasound: Imaging and Sensing 2020, 112400V (20 April 2020); doi: 10.1117/12.2548971
Show Author Affiliations
Dylan Marques, Univ. College London (United Kingdom)
James A. Guggenheim, Univ. College London (United Kingdom)
Rehman Ansari, Univ. College London (United Kingdom)
Edward Z. Zhang, Univ. College London (United Kingdom)
Paul C. Beard, Univ. College London (United Kingdom)
Peter R. T. Munro, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 11240:
Photons Plus Ultrasound: Imaging and Sensing 2020
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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