Open AccessTriplex micron-resolution acoustic, photoacoustic, and optical transmission microscopy via photoacoustic radiometry
Author(s) -
Michael Moore,
Eric M. Strohm,
Michael C. Kolios
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.022315
Subject(s) - optics , photoacoustic doppler effect , materials science , attenuation , laser , microscopy , photoacoustic effect , image resolution , acoustic microscopy , radiometry , signal (programming language) , transducer , physics , acoustics , computer science , programming language
We present a new sensing technique, termed photoacoustic radiometry (PAR), for mapping the optical attenuation properties of a sample. In PAR, laser pulses attenuated via transmission through the sample impinge on the ultrasound transducer and generate a photoacoustic (PA) signal within it. Spatial variation of the optical attenuation properties of the sample influences the amplitude of the PAR signal, providing image contrast. Performed simultaneously with pulse-echo ultrasound and PA imaging, this triplex imaging technique enables rapid characterization of samples with micrometer-resolution in a single scan. In this work, we demonstrate that the PAR technique can be easily integrated into existing PA microscopy systems, with applications in imaging biological samples and non-destructive evaluation of optically opaque materials such as silicon wafers.