Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 43: Poster Session: Quantum Dots and Wires - Preparation and Characterization / Devices (incl. Laser) / Ultrafast Phenomena
HL 43.22: Poster
Dienstag, 27. März 2012, 09:30–12:30, Poster D
Low-threshold polymeric microgoblet lasers — •Tobias Grossmann1,2,4, Torsten Beck1,2, Klinkhammer Sönke2,3,4, Christoph Vannahme4, Uli Lemmer2,3, Timo Mappes4, and Heinz Kalt1,2 — 1Institute of Applied Physics, Karlsruhe Institute of Technology KIT, 76128 Karlsruhe, Germany — 2DFG Center for Functional Nanostructures CFN, KIT, 76128 Karlsruhe, Germany — 3Light Technology Institute, KIT, 76128 Karlsruhe, Germany — 4Institute of Microstructure Technology, KIT, 76128 Karlsruhe, Germany
Optical whispering-gallery-mode (WGM) resonators like microspheres or microtoroids have evolved in recent years to versatile photonic devices with applications like lasers, filters or sensors. In particular, polymeric microcavities are of high potential since they combine a multitude of outstanding properties: exceedingly high quality factors (Q-factors), easy doping and thus realization also of active resonators and low material costs.
We have recently introduced a novel type of polymeric resonator with surface-tension induced cavity geometry: microgoblets of PMMA on silicon. These resonators are produced by subsequent planar lithography of the PMMA, isotropic etching of the silicon and a thermal reflow step. The latter not only leads to the goblet-like shape but also to a smooth cavity surface with reduced lithographic blemishes and thus to Q-factors of passive resonators exceeding 106. When doped with rhodamine 6G these resonators are efficient lasers at 600nm with a laser threshold as low as 3nJ/pulse.