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- W891355013 abstract "The combination of a planar waveguide and a one-dimensional diffraction grating allows to couple polarized monochromatic light under a given incident angle into and totally out of the all-dielectric compound structure. This optical property of a so-called dielectric waveguide-grating is ascribed to an electromagnetic resonance that exhibits three significant and remarkable features: A nearly complete suppression of the incident light in transmission geometry; a simultaneous increase of the reflectivity to almost 100 %; an emergence of strongly enhanced but rapidly decaying (evanescent) waves at the boundary interfaces of the waveguide layer.To understand the resonance of waveguide-gratings, substrates with a prestructured grating profile are coated with high refractive index waveguide materials. Subsequently, the anufactured waveguide-grating samples are characterized by laser light of different wavelengths. In order to analyze the resonance behavior, the spectrum as well as angular distribution of the transmitted and reflected light is detected and all of the experimental results are compared with numerical calculations. In addition to the samples with a purely passive structure, a specific porous waveguide material with a temperature-dependent refractive index allows a spectral shift of the resonance simply by changing the temperature of the sample.Furthermore, to determine the field enhancement near the waveguide interfaces, fluorescent dye molecules are applied on the surface of a waveguide-grating and are stimulated with an ultra-short pulse laser. Due to two-photon absorption processes of the dye molecules fluorescent light from the surface is emitted. Under resonance condition, a fluorescence enhancement by over two orders of magnitudes compared to a non-resonant excitation is observed. The resonant fluorescence excitation is still possible with a detection limit of only ten dye molecules on a square micrometer. As a result, one is able to successfully measure the enhanced fluorescence light of a labeled human self-peptide in an aqueous environment. This strongly suggests the waveguide-grating as an enhancement sensor platform in biotechnology." @default.
- W891355013 created "2016-06-24" @default.
- W891355013 creator A5074781881 @default.
- W891355013 date "2009-06-08" @default.
- W891355013 modified "2023-09-27" @default.
- W891355013 title "Dielektrische Wellenleitergitter in Resonanz" @default.
- W891355013 hasPublicationYear "2009" @default.
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