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Proceedings Paper

Photothermal microresonator absorption microscopy with backscatter detection
Author(s): Kevin D. Heylman; Erik H. Horak; Kassandra A. Knapper; Randall H. Goldsmith
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Paper Abstract

The extreme temperature sensitivity of whispering-gallery-mode (WGM) microresonators holds great promise as a detection strategy for single-particle photothermal microscopy and spectroscopy. The detection limit is currently partially constrained by frequency noise from the laser used to probe the cavity resonance wavelength. We present a measurement technique capable of simultaneously detecting backscattered and transmitted light from a wavelengthlocked optical microresonator, with laser intensity noise and frequency noise partitioned into the two independent detection channels. Photothermal mapping of single absorbing nano-objects demonstrates that both methods are capable of high signal/noise, exceeding 30,000:1 in the backscattering channel for a photothermally-induced microresonator resonance shift of 93 fm.

Paper Details

Date Published: 26 August 2015
PDF: 6 pages
Proc. SPIE 9554, Nanoimaging and Nanospectroscopy III, 95540U (26 August 2015); doi: 10.1117/12.2187240
Show Author Affiliations
Kevin D. Heylman, Univ. of Wisconsin-Madison (United States)
Erik H. Horak, Univ. of Wisconsin-Madison (United States)
Kassandra A. Knapper, Univ. of Wisconsin-Madison (United States)
Randall H. Goldsmith, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 9554:
Nanoimaging and Nanospectroscopy III
Prabhat Verma; Alexander Egner, Editor(s)

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