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HL: Fachverband Halbleiterphysik

HL 51: Photonic crystals II

HL 51.7: Vortrag

Freitag, 27. März 2009, 12:00–12:15, BEY 154

Reversed GaAs pyramids as new optical micro-cavities based on total internal reflection — •Daniel Rülke¹, Matthias Karl¹, Dongzhi Hu¹, Daniel M. Schaadt¹, Benjamin Kettner², Sven Burger², Frank Schmidt², Heinz Kalt¹, and Michael Hetterich¹ — ¹Institut für Angewandte Physik and DFG Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76128 Karlsruhe, Germany — ²Zuse Institut Berlin (ZIB), 14195 Berlin, Germany

We investigate the potential of GaAs pyramids standing upside down as a new type of optical micro-cavity based on total internal reflection. The latter are fabricated from molecular-beam epitaxy grown structures utilizing a combination of electron-beam lithography and wet-chemical etching, taking advantage of an AlAs sacrificial layer. Among other things, this approach allows us to realize coupled reversed pyramids or their electrical contacting via small bridges. In the pyramids we place In(Ga)As quantum dot layers as internal light source which emit in the range from 900 to 1050 nm after laser excitation. We identify optical modes in the cavities by their thermal behavior and map their spatial distribution for a better characterization. Due to their easily tunable geometrical dimensions reversed pyramidal resonators can access the intermediate regime between conventional and whispering-gallery-like mode behavior. Therefore, they should be promising candidates to enhance light matter interaction.