Liquid core microbubble resonators for highly sensitive temperature sensing

Jonathan M. Ward; Yong Yang; Sile Nic Chormaic

doi:10.1117/12.2038370

4 March 2014 Liquid core microbubble resonators for highly sensitive temperature sensing

Jonathan M. Ward, Yong Yang, Sile Nic Chormaic

Proceedings Volume 8960, Laser Resonators, Microresonators, and Beam Control XVI; 89601W (2014) https://doi.org/10.1117/12.2038370
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

It is experimentally shown that a large thermal blue shift of up to 100 GHz/K (0.2 nm/K at a wavelength of 775 nm) can be achieved with higher order radial modes in an ethanol-filled microbubble whispering gallery mode resonator (WGR). Q-factors for the most thermally sensitive modes are typically 10⁵, equivalent to a measurement resolution of 8.5 mK. The thermal shift rate is determined for different modes when the core of the microbubble is filled with air, water, and ethanol. The measured shifts are compared against Finite Element Model (FEM) simulations. It is also shown that, if the microbubble is in the quasi-droplet regime, the fundamental TE mode in a bubble with a 500 nm wall is estimated to experience a shift of 35 GHz/K, while the effective index is still high enough to allow efficient coupling to a tapered optical fiber. Nonetheless, at a wall thickness of 1 μm, the most sensitive modes (n = 2) observed were still strongly coupled.

Citation Download Citation

Jonathan M. Ward, Yong Yang, and Sile Nic Chormaic "Liquid core microbubble resonators for highly sensitive temperature sensing", Proc. SPIE 8960, Laser Resonators, Microresonators, and Beam Control XVI, 89601W (4 March 2014); https://doi.org/10.1117/12.2038370

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available