Fabrication of high- Q polydimethylsiloxane optical microspheresfor thermal sensing

Polydimethylsiloxane (PDMS) optical microspheres are fabricated and whispering gallery modes with quality factors of 10 6 in the 1480 nm band are demonstrated. The dependence of the resonance shifts on the input power is investigated in both the transient (blueshift) and the steady-state (redshift)...

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Bibliographic Details
Published in:Applied physics letters 2009-06, Vol.94 (23), p.231119-231119-3
Main Authors: Dong, C.-H., He, L., Xiao, Y.-F., Gaddam, V. R., Ozdemir, S. K., Han, Z.-F., Guo, G.-C., Yang, L.
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Summary:Polydimethylsiloxane (PDMS) optical microspheres are fabricated and whispering gallery modes with quality factors of 10 6 in the 1480 nm band are demonstrated. The dependence of the resonance shifts on the input power is investigated in both the transient (blueshift) and the steady-state (redshift) regimes. Moreover, we demonstrate that such high- Q PDMS optical resonators can be used as highly sensitive thermal sensors with temperature sensitivity of 0.245   nm / ° C , which is one order of magnitude higher than conventional silica microsphere resonators. The estimated thermal resolution of the sensor is 2 × 10 − 4 ° C .
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3152791