Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.11: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Hybrid GRIN lense microresonator for sensing applications — •Michael Metzger1, Andreas Horrer2, Sabrina Rau1, Günther Gauglitz1, Dieter Kern2, Monika Fleischer2, Dai Zhang1, Alfred J. Meixner1, and Marc Brecht3 — 1IPTC, University of Tübingen, Germany — 2Institute for Applied Physics, University of Tübingen, Germany — 3Zürcher Hochschule für Angewandte Wissenschaften, IAMP, Winterthur, Switzerland
An optical hybrid system consisting of a gradient-index lense (GRIN lense) and a Fabry-Pérot optical microresonator used as a sensitive and compact refractive index sensor is presented. GRIN lenses are miniaturized optical elements, which achieve their focusing effect by a gradient of the refractive index within the lens material. The GRIN lenses enable controlled positioning of the focal plane at one of their flat surfaces. Our microresonator consists of two opposing mirrors - a silver coated GRIN lense and a curved mirror in close proximity (λ/2-region). The transmission through the resonator shows a spectrally well-defined Newton ring pattern. The transmission wavelength depends on the mirror spacing and the intra cavity refractive index. The combination of a GRIN lense with a Fabry-Pérot optical microresonator gives us the opportunity to sense smallest changes of the intra cavity refractive index. The reflective layers can be supplemented with an antibody layer to conduct further analytical tests like detection of single macromolecules (e.g. antibody virus bonding) affecting the cavities' dielectric properties. This project was financed by Baden-Württemberg Stiftung.