High-Q conical polymeric microcavities

Grossmann, Tobias; Hauser, Mario; Beck, Torsten; Gohn-Kreuz, Cristian; Karl, Matthias; Kalt, Heinz; Vannahme, Christoph; Mappes, Timo
January 2010
Applied Physics Letters;1/4/2010, Vol. 96 Issue 1, p013303
Academic Journal
We report on the fabrication of high-Q microresonators made of low-loss, thermoplastic polymer poly(methyl methacrylate) (PMMA) directly processed on a silicon substrate. Using this polymer-on-silicon material in combination with a thermal reflow step enables cavities of conical geometry with an ultrasmooth surface. The cavity Q factor of these PMMA resonators is above 2×106 in the 1300 nm wavelength range. Finite element simulations show the existence of a variety of “whispering gallery” modes in these resonators explaining the complexity of the measured transmission spectra.


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