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Authors: E. Hallynck, P. Bienstman
Title: Photonic crystal biosensor based on angular spectrum analysis
Format: International Journal
Publication date: 8/2010
Journal/Conference/Book: Optics Express
Volume(Issue): 18(17) p.18164-18170
DOI: 10.1364/OE.18.018164
Citations: 24 ( - last update: 3/12/2023)
17 (OpenCitations - last update: 3/5/2023)
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The need for cost effective and reliable biosensors in e.g. medical applications is an ever growing and everlasting one. Not only do we strive to increase sensitivity and detection limit of such sensors; ease of fabrication or implementation are equally important. In this work, we propose a novel, photonic crystal based biosensor that is able to operate at a single frequency, contrary to resonance based sensors. In a certain frequency range, guided photonic crystal modes can couple to free space modes resulting in a Lorentzian shape in the angular spectrum. This Lorentzian can shift due to refractive index changes and simulations have shown sensitivities of 65° per refractive index unit and more.

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