Regensburg 2010 – wissenschaftliches Programm
HL 60.8: Poster
Donnerstag, 25. März 2010, 18:00–20:00, Poster D1
Optical properties of high-Q conical polymeric microcavities — •Simone Schleede1, Mario Hauser1, Tobias Grossmann1,2, Julian Fischer1, Torsten Beck1, Christoph Vannahme2, Timo Mappes2, and Heinz Kalt1 — 1Institut für Angewandte Physik, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Institut für Mikrostrukturtechnik, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
We report on the fabrication of novel high-Q microresonators made of low loss, thermoplastic polymer poly(methyl methacrylate) (PMMA), which are directly processed on a silicon substrate. Using this polymer-on-silicon material in combination with a thermal reflow step enables cavities of conical shape and ultra smooth surface, dramatically reducing the optical losses caused by surface scatting of the whispering-gallery-modes (WGMs). The cavity Q factor is above two million in the 1300 nm wavelength region and can theoretically reach values greater than ten million in the visible spectral range. Finite element simulations show the existence of a variety of higher order radial and axial WGMs explaining the complexity of the transmission spectra measured using a tunable diode laser coupled to a tapered optical fiber waveguide.
Furthermore, integration of dyes as gain media to the polymer cavities, offers a new possibility for realization of optically pumped, low-threshold, organic microlasers.