Title: Sensitivity enhancement of photothermal microscopy with radially segmented balanced detection
Authors: Miyazaki, Jun
Tsurui, Hiromichi
Kawasumi, Koshi
Kobayashi, Takayoshi
Department of Electrophysics
Issue Date: 15-Feb-2015
Abstract: A novel detection method is proposed for highly sensitive photothermal microscopic imaging. This method is based on the characteristics of an angular-dependent photothermal signal; it improves signal intensity by up to two times and rejects the intensity noise of the probe beam. The subdiffraction resolution photothermal imaging of mouse skin melanoma is demonstrated using a laser diode-based photothermal microscopy system to evaluate this method. We confirm that the signal intensity is enhanced 1.7 times compared with the conventional detection method. Moreover, the intensity noise of the laser diode used for the probe beam is effectively reduced by approximately 31 dB, even for a sample with non-uniformity of the refractive index and stationary absorption. This method is implemented by means of a commonly used balanced detector and is thus potentially useful for high-speed imaging. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OL.40.000479
ISSN: 0146-9592
DOI: 10.1364/OL.40.000479
Volume: 40
Begin Page: 479
End Page: 482
Appears in Collections:Articles