Cavity ring‑up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator

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Cavity ring‑up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator

Yang, Yong; Madugani, Ramgopal; Kasumie, Sho; Ward, Jonathan M.; Nic Chormaic, Síle
Date: 2016-11-26
Copyright: © 2016, the Authors. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright information: http://creativecommons.org/licenses/by/4.0/
Citation: Yang, Y., Madugani, R., Kasumie, S., Ward, J. M. and Nic Chormaic, S. (2016) ‘Cavity ring‑up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator’, Applied Physics B, 122: 291 (10pp). doi:10.1007/s00340-016-6565-y
Published Version: 10.1007/s00340-016-6565-y

Abstract:

In whispering gallery mode resonator sensing applications, the conventional way to detect a change in the parameter to be measured is by observing the steady-state transmission spectrum through the coupling waveguide. Alternatively, sensing based on cavity ring-up spectroscopy, i.e. CRUS, can be achieved transiently. In this work, we investigate CRUS using coupled mode equations and find analytical solutions with a large spectral broadening approximation of the input pulse. The relationships between the frequency detuning, coupling gap and ring-up peak height are determined and experimentally verified using an ultrahigh Q-factor silica microsphere. This work shows that distinctive dispersive and dissipative transient sensing can be realised by simply measuring the peak height of the CRUS signal, which may improve the data collection rate.

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© 2016, the Authors. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Except where otherwise noted, this item's license is described as © 2016, the Authors. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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