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Silicon nano-membrane based photonic crystal microcavities for high sensitivity bio-sensing

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Abstract

We experimentally demonstrated photonic crystal microcavity based resonant sensors coupled to photonic crystal waveguides in silicon nano-membrane on insulator for chemical and bio-sensing. Linear L-type microcavities are considered. In contrast to cavities with small mode volumes, but low quality factors for bio-sensing, we showed increasing the length of the microcavity enhances the quality factor of the resonance by an order of magnitude and increases the resonance wavelength shift while retaining compact device characteristics. Q~26760 and sensitivity down to 15ng/ml and110pg/mm2 in bio-sensing was experimentally demonstrated on silicon-on-insulator devices.

©2012 Optical Society of America

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