design of a label-free, distributed bragg grating resonator based dielectric waveguide biosensor
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ID: 152232
2015
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Abstract
In this work, we present a resonant, dielectric waveguide device based on distributed Bragg gratings for label-free biosensing applications. The refractive index sensitive optical transducer aims at improving the performance of planar waveguide grating sensor systems with limited Q-factor and dynamic range by combing the advantages of resonant cavities, such as a multitude of resonance peaks with high finesse, with the manageable complexity of waveguide grating couplers. The general sensor concept is introduced and supported by theoretical considerations as well as numerical simulations based on Coupled Mode Theory. In contrast to a single Bragg grating reflector, the presented Fabry-Pérot type distributed Bragg resonator exhibits an extended measurement range as well as relaxed fabrication tolerances. The resulting, relatively simple sensor structure can be fabricated with standard lithographic means and is independent of expensive light-sources and/or detectors, making an affordable but sensitive device, potentially suitable for point-of-care applications.
| Reference Key |
kehl2015photonicsdesign
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| Authors | ;Florian Kehl;David Bischof;Markus Michler;Mirjad Keka;Ross Stanley |
| Journal | pakistan journal of medical sciences |
| Year | 2015 |
| DOI |
10.3390/photonics2010124
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