Dresden 2014 – scientific programme
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BP: Fachverband Biologische Physik
BP 12: Posters: Imaging
BP 12.9: Poster
Tuesday, April 1, 2014, 09:30–12:30, P1
Space- and time-resolved information of refraction index in a microresonator — •Tobias Menold1,2, Michael Metzger1, Alexander Konrad1, Andreas Horrer2, Sabrina Rau1, Günther Gauglitz1, Dai Zhang1, Alfred J. Meixner1, Dieter Kern2, Marc Brecht1,3, and Monika Fleischer2 — 1IPTC, University of Tübingen — 2Institute for Applied Physics, University of Tübingen — 3Zürcher Hochschule für Angewandte Wissenschaften, Institute of Applied Mathematics and Physics
The aim of our research is to determine the change of the refractive index within a Fabry Perot microresonator, consisting of a flat and a curved mirror in close distance (λ/2-region), in space and time using a standard colour CCD camera. Using white light illumination yields a position dependent transmission. If a flat and a convex mirror are used the transmission shows a spectrally well-defined Newton ring pattern. The possibility to sense small changes of the refractive index within the cavity depends on the resonator properties and the wavelength resolution of the CCD camera. The main issue is to extract the wavelength with high resolution out of the RGB values determined by the CCD camera. For this purpose we calibrated the CCD-chip using the transmission pattern of monochromatic light with a spectral range between 380 nm and 650 nm. Based on these images we were able to calculate the hue-value of HSV colour space. With that calibration it is possible to translate information from the CCD-camera into refraction index information. The calibration enables us to determine the refraction index within a microresonator with spatial and temporal resolution.