Modelling the response of whispering-gallery-mode optical resonators for biosensing applications

W. Langbein; L. Chantada; N. I. Nikolaev; A. Ivanov; P. Borri

doi:10.1117/12.808790

16 February 2009 Modelling the response of whispering-gallery-mode optical resonators for biosensing applications

W. Langbein, L. Chantada, N. I. Nikolaev, A. Ivanov, P. Borri

Proceedings Volume 7188, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VI; 71880G (2009) https://doi.org/10.1117/12.808790
Event: SPIE BiOS, 2009, San Jose, California, United States

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.

Citation Download Citation

W. Langbein, L. Chantada, N. I. Nikolaev, A. Ivanov, and P. Borri "Modelling the response of whispering-gallery-mode optical resonators for biosensing applications", Proc. SPIE 7188, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VI, 71880G (16 February 2009); https://doi.org/10.1117/12.808790

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