Effects of uniaxial pressure on polar whispering gallery modes in microspheres

Wagner, H. P., Schmitzer, H., Lutti, Julie, Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 and Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 2013. Effects of uniaxial pressure on polar whispering gallery modes in microspheres. Journal of Applied Physics 113 (24) , 243101. 10.1063/1.4811447

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Abstract

We investigate the detuning of whispering gallery modes (WGMs) in solid polystyrene microspheres (PM) as a function of axisymmetric stress applied to two antipodal points of the microsphere we call poles. We specifically investigate WGMs passing close to these poles, so-called polar WGMs. The applied uniaxial pressure reduces the geometrical circumference of the PM but also increases locally the refractive index at the flattened poles. Our experiments show that the WGMs shift to higher frequencies with increasing pressure and that the magnitude of the strain-induced shift depends on the radial mode number n. Furthermore an energy splitting between azimuthal modes linearly increasing with the pressure is observed. A theoretical model based on a classical ray optics approach is presented which reproduces the main results of our experimental observations.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Physics and Astronomy
Subjects:	Q Science > QC Physics
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0021-8979/ (accessed 21/02/2014).
Publisher:	American Institute of Physics
ISSN:	0021-8979
Funders:	BBSRC, EPSRC
Date of First Compliant Deposit:	30 March 2016
Last Modified:	10 Apr 2024 06:56
URI:	https://orca.cardiff.ac.uk/id/eprint/49679

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