Fabrication of high-Q polydimethylsiloxane optical microspheres for thermal sensing

Dong, C.-H.; He, L.; Xiao, Y.-F.; Gaddam, V. R.; Ozdemir, S. K.; Han, Z.-F.; Guo, G.-C.; Yang, L.
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p231119
Academic Journal
Polydimethylsiloxane (PDMS) optical microspheres are fabricated and whispering gallery modes with quality factors of 106 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.


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