Photothermal microresonator absorption microscopy with backscatter detection

Kevin D. Heylman; Erik H. Horak; Kassandra A. Knapper; Randall H. Goldsmith

doi:10.1117/12.2187240

26 August 2015 Photothermal microresonator absorption microscopy with backscatter detection

Kevin D. Heylman, Erik H. Horak, Kassandra A. Knapper, Randall H. Goldsmith

Proceedings Volume 9554, Nanoimaging and Nanospectroscopy III; 95540U (2015) https://doi.org/10.1117/12.2187240
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Kevin D. Heylman, Erik H. Horak, Kassandra A. Knapper, and Randall H. Goldsmith "Photothermal microresonator absorption microscopy with backscatter detection", Proc. SPIE 9554, Nanoimaging and Nanospectroscopy III, 95540U (26 August 2015); https://doi.org/10.1117/12.2187240

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