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Proceedings Paper

Modelling the response of whispering-gallery-mode optical resonators for biosensing applications
Author(s): W. Langbein; L. Chantada; N. I. Nikolaev; A. Ivanov; P. Borri
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Paper Abstract

We present a theoretical analysis of the response of whispering gallery modes for biosensing applications, studied numerically in microcylinders and semi-analytically in microspheres. The effect of single and multiple particles is calculated, simulating biological analytes of different sizes and polarizabilities attached to the microresonator surface. Besides whispering-gallery-mode frequency shifts, we find that also broadenings and splittings (from lifted rotational symmetry) appear due to particles attachment and/or the vicinity to a planar coupler. For a single analyte, both particle size and refractive index can be determined from the broadening and shift, opening the perspective to a new biosensing modality.

Paper Details

Date Published: 16 February 2009
PDF: 7 pages
Proc. SPIE 7188, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VI, 71880G (16 February 2009); doi: 10.1117/12.808790
Show Author Affiliations
W. Langbein, Cardiff Univ. (United Kingdom)
L. Chantada, Cardiff Univ. (United Kingdom)
N. I. Nikolaev, Cardiff Univ. (United Kingdom)
A. Ivanov, Cardiff Univ. (United Kingdom)
P. Borri, Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7188:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VI
Alexander N. Cartwright; Dan V. Nicolau, Editor(s)

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