Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 93: Poster Session: Metal-Semiconductor Hybrid Systems, Plasmonic Systems / Photonic Crystals / Carbon: Diamond & CNT / Quantum Information Systems

HL 93.14: Poster

Donnerstag, 29. März 2012, 16:00–19:00, Poster D

High-Q Polymer Goblet Resonators for Biosensing Applications — •Torsten Beck¹, Saskia Becker¹, Tobias Grossmann^1,2, Patrik Rath¹, Assegid Flatae¹, and Heinz Kalt¹ — ¹Institut für Angewandte Physik, KarlsruherInstitut für Technologie (KIT), Karlsruhe, Germany — ²Institut für Mikrostukturtechnik, KarlsruherInstitut für Technologie (KIT), Karlsruhe, Germany

Biosensors for label-free molecule detection with high sensitivity are of great interest for many applications in life sciences. We developed a new type of whispering gallery mode (WGM) resonator made of out of low-loss polymer poly (methyl methacrylate) (PMMA). These optical cavities are fabricated using standard semiconductor processing methods in combination with a specific thermal reflow process. A significantly reduced surface roughness results in low surface scattering losses of the WGMs, as lithographic blemishes vanish. The Q-factor of these goblet resonators is above two million in the 1310 nm wavelength range. The high optical quality and the fabrication method suitable to mass production make these resonators promising candidates for lowcost bio-sensing devices with low limit of detection. Various surface functionalization methods for selective binding of specific molecules were investigated. The influence on the optical properties of the resonators was determined. In order to demonstrate the applicability of the goblet resonators for bio-sensing, Bovine Serum Albumin was detected by monitoring the spectral shift of resonator modes due to protein adsorption.