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We investigate scatterer induced mode splitting in a composite microtoroidalresonator (Q ~ 10^6) fabricated by coating a silica microtoroid (Q ~ 10^7) witha thin poly(dimethylsiloxane) layer. We show that the two split modes in bothcoated and uncoated silica microtoroids respond in the same way to the changesin the environmental temperature. This provides a self-referencing scheme whichis robust to temperature perturbations. Together with the versatilefunctionalities of polymer materials, mode splitting in polymer and polymercoated microresonators offers an attractive sensing platform that is robust tothermal noise.

Scatterer induced mode splitting in poly(dimethylsiloxane) coated microresonators