NDLI: Optical microbubble resonator

Content Provider	IEEE Xplore Digital Library
Author	Sumetsky, M.
Copyright Year	2010
Description	Author affiliation: OFS Laboratories, 19 Schoolhouse Rd., Somerset, New Jersey, USA 08873 (Sumetsky, M.)
Abstract	Investigation and application of the high Q-factor optical microresonators became an interesting and rapidly developing field of modern optics. Special attention is given to the Fabry-Perot, ring, disk, sphere, and toroid microresonators as well as more recently introduced bottle, coil, and capillary microresonators. Optical microresonators are demonstrated as super-perceptive physical, chemical and biological sensors, microlasers, and have promising applications in cavity quantum electrodynamics, cavity optomechanics, and other areas of fundamental and applied research and development. This presentation reports recent demonstration of a new type of optical microresonator - a silica microbubble resonator. The fabrication method of this resonator is based on blowing a microbubble using the stable radiative C0 laser heating rather than the unstable convective heating in a flame or furnace. Microbubbles are created along a microcapillary and are naturally opened to the input and output microfluidic or gas channels. The demonstrated optical microbubble resonators have a few hundred micron diameter and around one micron wall thickness. The resonant properties of a microbubble are studied by coupling it to a microfiber. A biconical taper with a microfiber waist is fabricated from a conventional single mode fiber by adiabatic tapering using the C0 laser indirect heating method. The measured Q-factor of a microbubble resonator exceeds $10^{6}$ (limited by the resolution of the measurement device used). The transmission spectrum of an empty microbubble is compared to the spectrum of the same microbubble filled with ethanol. As an application, the mechanical tunability of a microbubble resonator was experimentally investigated by stretching it with a PZT. Previously, both thermal and mechanical tuning of high Q-factor microresonators has been considered. However, the full tunability (i.e. the tunable range exceeding the azimuthal free spectral range of a microresonator) has not been achieved. Here, a fully tunable silica MBR having a tuning range more than two times larger than the azimuthal free spectral range of this resonator is demonstrated [2]. This is the largest tuning range ever achieved for the high Q-factor microcavities (microspheres, microspheroids, microtoroids, etc.) significantly exceeding the record result obtained previously. Tunability of a microbubble resonator is accomplished with a much smaller stretching force than that needed for a similar bulk microresonator.
Starting Page	1
Ending Page	1
File Size	102140
Page Count	1
File Format	PDF
ISBN	9781424477999
e-ISBN	9781424477982
e-ISBN	9781424477975
DOI	10.1109/ICTON.2010.5549055
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-27
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical resonators Microcavities Biomedical optical imaging Optical sensors Q factor Heating Laser tuning Silicon compounds Tunable circuits and devices Fabry-Perot optical sensors optical fiber devices optical microresonators high Q-factor optical resonators tunable microresonators
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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