Thin polymer etalon arrays for high-resolution photoacoustic imaging

Yang Hou; Sheng-Wen Huang; Shai Ashkenazi; Russell S. Witte; Matthew O'Donnell

doi:10.1117/1.3042260

1 November 2008 Thin polymer etalon arrays for high-resolution photoacoustic imaging

Yang Hou, Sheng-Wen Huang, Shai Ashkenazi, Russell S. Witte, Matthew O'Donnell

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Journal of Biomedical Optics, Vol. 13, Issue 6, 064033 (November 2008). https://doi.org/10.1117/1.3042260

Abstract

Thin polymer etalons are demonstrated as high-frequency ultrasound sensors for three-dimensional (3-D) high-resolution photoacoustic imaging. The etalon, a Fabry-Perot optical resonator, consists of a thin polymer slab sandwiched between two gold layers. It is probed with a scanning continuous-wave (CW) laser for ultrasound array detection. Detection bandwidth of a 20-μm-diam array element exceeds 50 MHz, and the ultrasound sensitivity is comparable to polyvinylidene fluoride (PVDF) equivalents of similar size. In a typical photoacoustic imaging setup, a pulsed laser beam illuminates the imaging target, where optical energy is absorbed and acoustic waves are generated through the thermoelastic effect. An ultrasound detection array is formed by scanning the probing laser beam on the etalon surface in either a 1-D or a 2-D configuration, which produces 2-D or 3-D images, respectively. Axial and lateral resolutions have been demonstrated to be better than 20 μm. Detailed characterizations of the optical and acoustical properties of the etalon, as well as photoacoustic imaging results, suggest that thin polymer etalon arrays can be used as ultrasound detectors for 3-D high-resolution photoacoustic imaging applications.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Yang Hou, Sheng-Wen Huang, Shai Ashkenazi, Russell S. Witte, and Matthew O'Donnell "Thin polymer etalon arrays for high-resolution photoacoustic imaging," Journal of Biomedical Optics 13(6), 064033 (1 November 2008). https://doi.org/10.1117/1.3042260

Published: 1 November 2008

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