Abstract
An approach to the simultaneous measurement of refractive-index (RI) and
temperature changes using optical ring resonators is proposed and theoretically
demonstrated. With a liquid-core silica ring resonator as an example, two
different-order whispering gallery modes (WGMs) might differ in not only RI but also
temperature sensitivities. Thus, a second-order sensing matrix should be defined
based on these WGMs to determine RI and temperature changes simultaneously. The
analysis shows that the RI and temperature detection limits can be achieved on the
order of 10<sup>-7</sup> RI unit and 10<sup>-3</sup> K at a wavelength of
approximately 780 nm.
© 2012 Chinese Optics Letters
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