Dielectric perturbations: anomalous resonance frequency shifts in optical resonators
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Small perturbations in the dielectric environment around resonant dielectric structures usually lead to a frequency shift of the resonator modes directly proportional to the polarizability of the perturbation. Here, we report experimental observations of strong frequency shifts that can oppose and even exceed the contribution of the perturbations’ polarizability. We show in particular how the mode frequencies of a lithium niobate whispering-gallery-mode resonator are shifted by planar substrates—of refractive indices ranging from 1.50 to 4.22—contacting the resonator rim. Both blue- and redshifts are observed, as well as an increase in mode linewidth, when substrates are moved into the evanescent field of the whispering gallery mode. We compare the experimental results to a theoretical model by Foreman et al. [J. Opt. Soc. Am. B 33, 2177 (2016) [CrossRef] ] and provide an additional intuitive explanation based on the Goos–Hänchen shift for the optical domain, with applications to dielectric structures ranging from meta-surfaces to photonic crystal cavities.
Date Issued
2021-05-15
Date Acceptance
2021-04-08
Citation
Optics Letters, 2021, 46 (10), pp.2477-2480
ISSN
0146-9592
Publisher
Optical Society of America
Start Page
2477
End Page
2480
Journal / Book Title
Optics Letters
Volume
46
Issue
10
Copyright Statement
© 2021 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000651899500059&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Optics
WHISPERING-GALLERY MODES
REFRACTIVE-INDEX
SELLMEIER COEFFICIENTS
NANOPARTICLE DETECTION
MICROSPHERE
WAVELENGTH
Publication Status
Published
Date Publish Online
2021-04-08