Cavity ring‑up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator
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Published Version
Date
2016-11-26
Authors
Yang, Yong
Madugani, Ramgopal
Kasumie, Sho
Ward, Jonathan M.
Nic Chormaic, Síle
Journal Title
Journal ISSN
Volume Title
Publisher
Springer International Publishing
Published Version
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.
Description
Keywords
CRUS , Cavity ring-up spectroscopy
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