An alignment-free fiber-coupled microsphere resonator for gas sensing applications

Gregor, Markus; Pyrlik, Christoph; Henze, Rico; Wicht, Andreas; Peters, Achim; Benson, Oliver
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p231102
Academic Journal
In this paper we report on the assembly of a robust sensor system consisting of a polystyrene microsphere resonator attached to an optical fiber taper. Since the sphere is only supported by the micrometer-sized fiber no further alignment is necessary. This results in a thermally and mechanically well isolated optical resonator system with quality factors as high as 6×105. The narrow resonances of whispering gallery modes supported by the polystyrene resonators shift with temperature at a rate of 3.8 GHz/K. Thus, a sensitive thermometer is established which allows to detect the surrounding gas via its characteristic thermal conductivity.


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