Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster Laserspektroskopie
Q 31.4: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster C
Simulation of optical properties of ZnO nanowires for evanescent field sensors — •Sandra Börner1, Christian Rueter1, Tobias Voss2, and Wolfgang Schade1 — 1Institute of Physics and Physical Technologies, Clausthal University of Technologies, Clausthal-Zellerfeld — 2Institute of Solid State Physics, University of Bremen, Bremen
Optical waveguides within the diameter range of micrometers are successfully applicated in optical communication or optical sensing. Optical µm fibers are used for evanescent detection of gas species or molecules in liquid media. Nanorods or nanowires are efficient waveguides in a certain diameter range. It is reported that the ratio of the evanescent field to the total electric field can increase to almost hundred percent at diameters smaller than the guided wavelength. A miniaturized setup of high efficiency is possible using a single nanowire or nanowire arrays for evanescent field based sensors. As ZnO nanowires can be produced in good crystalline quality and well aligned arrays they are simulated for the applicability in such sensors. Therefore in a first approach the optical properties of ZnO nanorods are studied using a free available block-iterative frequency-domain method (MPB). The analysis was done for different wavelengths, diameters and distances between the nanorods. An experimental setup and first experimental results are presented.