Highly Sensitive Temperature Measurements With Liquid-Core Microbubble Resonators

Author

Ward, Jonathan M. ; Yong Yang ; Chormaic, Site Nic

Author_Institution

Light-Matter Interactions Unit, Okinawa Inst. of Sci. & Technol. Grad. Univ., Okinawa, Japan

Volume

25

Issue

23

fYear

2013

fDate

Dec.1, 2013

Firstpage

2350

Lastpage

2353

Abstract

The thermal shifting of whispering gallery modes (WGMs) in a microbubble resonator is investigated. The thermal shift rate is determined for different modes when the core of the microbubble is filled with air, water and ethanol. Sensitivities as high as 100 GHz/K (0.2 nm/K at wavelength of 775 nm) are observed when the microbubble core is filled with ethanol. This is the largest thermal shift rate reported for a WGM resonator. We also show that thermal behavior of the WGMs in a thin-shelled, air-filled microbubble is different from a solid microsphere. The measured shifts are compared against finite element model simulations. Q-factors for the higher order modes are typically 10⁵, equivalent to a measurement resolution of 8.5 mK.

Keywords

Q-factor; bubbles; finite element analysis; microfluidics; temperature measurement; whispering gallery modes; Q-factor; ethanol; finite element model simulations; highly sensitive temperature measurements; liquid-core microbubble resonators; microbubble core; solid microsphere; thermal shift rate; whispering gallery modes; Glass; Optical fiber sensors; Optical fibers; Optical resonators; Solids; Temperature measurement; Temperature sensors; Microbubble resonator; microfluidics; temperature measurement; whispering gallery modes;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2283732

Filename

6615952