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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 5 — Mar. 1, 2005
  • pp: 510–512

Nanolayer characterization through wavelength multiplexing of a microsphere resonator

Mayumi Noto, Frank Vollmer, David Keng, Iwao Teraoka, and Stephen Arnold  »View Author Affiliations


Optics Letters, Vol. 30, Issue 5, pp. 510-512 (2005)
http://dx.doi.org/10.1364/OL.30.000510


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Abstract

We optically characterize nanolayer (< 150 nm) formation in situ on a silica microsphere in an aqueous environment by simultaneously following the shifts of whispering-gallery modes at two wavelengths. This approach was inspired by layer perturbation theory, which indicates that these two measurements can be used to determine independently both the thickness and the optical dielectric constant. The theory is verified for extreme cases and used to characterize a biophysically relevant hydrogel nanolayer with an extremely small excess refractive index of 0.0012.

© 2005 Optical Society of America

OCIS Codes
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(300.6490) Spectroscopy : Spectroscopy, surface

Citation
Mayumi Noto, Frank Vollmer, David Keng, Iwao Teraoka, and Stephen Arnold, "Nanolayer characterization through wavelength multiplexing of a microsphere resonator," Opt. Lett. 30, 510-512 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-5-510

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