Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.11: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Development of Photonic Sensors for Parallel Molecule Detection on the Basis of Toroidal Microresonators — •Tobias Grossmann, Christian Schäfer, Cristian Gohn-Kreuz, Torsten Beck, Mario Hauser, and Heinz Kalt — Universität Karlsruhe (TH), Karlsruhe, Germany

We report on the progress of the development of a versatile photonic sensor for label-free detection of proteins and DNA sequences based on toroidal semiconductor microresonators.

The detection principle bases on the shift of the frequency of optical whispering gallery modes (WGMs). Each resonator will be functionalized by fixing proteins to its perimeter which can selectively bind to well defined partners as in the case for complementary DNA sequences or antigen/antibody combinations. The evanescent field of the WGM polarizes a molecule attached to the resonator which in return shifts the mode frequency.

For detection of the modal shift of WGMs a setup using a tapered single mode fiber will be shown. An approach for the fabrication of a microfluidic channel and integrated waveguides passing the resonators in a small distance will be presented. First results of the fabrication and characterization of the optical modes will be discussed.