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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 23 — Dec. 1, 2011
  • pp: 4536–4538

Tuning whispering gallery modes using internal aerostatic pressure

Rico Henze, Tom Seifert, Jonathan Ward, and Oliver Benson  »View Author Affiliations


Optics Letters, Vol. 36, Issue 23, pp. 4536-4538 (2011)
http://dx.doi.org/10.1364/OL.36.004536


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Abstract

Aerostatic tuning of whispering gallery modes (WGMs) in a microbubble resonator is demonstrated. The optical modes are redshifted over hundreds of gigahertz (GHz) simply by increasing the air pressure (up to 6 bars ) inside the microbubble. A description of the pressure tuning properties of the WGMs in microbubbles is given in terms of the corresponding elasto-optical equations of spherical shells and the results are compared to experimental data. Microbubbles as small as 74 μm are tested and the experimental results show excellent agreement with the theory. An estimation method is developed for calculating the wall thicknesses of the microbubbles from the diameters, which are measured via direct microscopy. A geometrical factor χ is defined and a linear relationship between the shift rate (GHz/bar) of the bubbles modes and χ is observed.

© 2011 Optical Society of America

OCIS Codes
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.3990) Optical devices : Micro-optical devices
(140.3948) Lasers and laser optics : Microcavity devices
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(280.5475) Remote sensing and sensors : Pressure measurement

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: August 18, 2011
Revised Manuscript: October 4, 2011
Manuscript Accepted: October 4, 2011
Published: November 23, 2011

Citation
Rico Henze, Tom Seifert, Jonathan Ward, and Oliver Benson, "Tuning whispering gallery modes using internal aerostatic pressure," Opt. Lett. 36, 4536-4538 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-23-4536


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