Abstract

We demonstrate a new method to tune the resonance of whispering gallery modes in a fused silica optical microsphere resonator by removing atomic layers from the sphere surface with low concentrations of hydrofluoric acid. Our results show that the WGMs can be tuned over 660 pm (430 GHz), more than one free spectral range of the microsphere resonator, with a tuning precision better than 0.2 pm (130 MHz). Both atomic force microscope images and a Q-factor measurement performed in air suggest that no additional degradation in Q-factor due to surface roughness is introduced during this etching process.

© 2005 Optical Society of America

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Appl. Phys. Lett. (1)

F. Vollmer, D. Braun, and A. Libchaber, "Protein detection by optical shift of a resonant microcavity," Appl. Phys. Lett. 80, 4057-4059 (2002).
[CrossRef]

Biophys. J. (1)

F. Vollmer, S. Arnold, D. Braun, I. Teraoka, and A. Libchaber, "Multiplexed DNA quantification by spectroscopic shift of two microsphere cavities," Biophys. J. 85, 1974-1979 (2003).

Europhys. Lett. (1)

L. Collot, V. Lefevre-Seguin, M. Brune, J. -M. Raimond, and S. Haroche, "Very high-Q whispering-gallery mode resonances observed on fused silica microspheres," Europhys. Lett. 23, 327-334 (1993).

J. Opt. Soc. Am. B (1)

Laser Resonators and Beam Control V (1)

J. L. Nadeau, V. S. Ilchenko, D. Kossakovski, G. H. Bearman, L. Maleki, "High-Q whispering-gallery mode sensor in liquids," in Laser Resonators and Beam Control V, A. V. Kudryashov, ed., Proc. SPIE 4629, 172-180 (2002).

Nature (1)

K. J. Vahala, "Optical microcavities," Nature 424, 839-846 (2003).
[CrossRef]

Opt. Commun. (1)

V. S. Ilchenko, P. S. Volikov, V. L. Velichansky, F. Treussart, V. Lefevre-Seguin, J. -M. Raimond, and S. Haroche, "Strain-tunable high-Q optical microsphere resonator," Opt. Commun. 145, 86-90 (1998).
[CrossRef]

Opt. Express (1)

Opt. Lett. (7)

Sens. Actuators, B (1)

N. M. Hanumegowda, I. White, and X. Fan, "Aqueous mercuric ion detection with microsphere optical ring resonator sensors," Sens. Actuators, B, (submitted).

Other (2)

Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004 Digest of the LEOS Summer Topical Meeting (IEEE, Piscataway, NJ, 2004).

R. K. Chang and A. J. Campillo, eds., Optical Processes in Microcavities (World Scientific, Singapore, 1996).

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