Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 30, Issue 12, Pages 3254-3259Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.30.003254
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Funding
- Ministerio de Econom a y Competitividad of Spain (MINECO) within the National Program of Materials [MAT2010-21270-C04-02, Consolider-Ingenio 2010 Program, MALTA CSD2007-0045]
- EU-FEDER
- ACIISI of Gobierno de Canarias [ID20100152]
- MICINN for the FPI [BES-2008-003353]
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The effects of pressure on the behavior of optical microspherical resonators, prepared from Nd3+ doped, barium titanium silicate glass, have been studied up to 5 GPa inside a diamond anvil cell using silicone oil as the hydrostatic transmission medium and ruby emission lines as the pressure gauge. The optical resonances, known as whispering gallery modes, were observed within the broad emission band of the Nd3+ ions, and the resonances were identified as a function of pressure. By means of simulations, it was found that the average wavelength position of both transverse electric and magnetic modes depended on the radius and refractive index of the sphere, but not on the refractive index of the pressure transmitting medium under the experimental conditions. This was used to define the average sensitivity of the resonant modes with the pressure. Therefore, a value of 6.5 x 10(-4) GPa(-1) has been obtained for this sensitivity, which is higher than the value for ruby, the most conventional pressure sensor. (C) 2013 Optical Society of America
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