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23 February 2017 Resonant photonic structures in porous silicon for biosensing
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The formation of resonant photonic structures in porous silicon leverages the benefit of high surface area for improved molecular capture that is characteristic of porous materials with the advantage of high detection sensitivity that is a feature of resonant optical devices. This review provides an overview of the biosensing capabilities of a variety of resonant porous silicon photonic structures including microcavities, Bloch surface waves, ring resonators, and annular Bragg resonators. Detection sensitivities > 1000 nm/RIU are achieved for small molecule detection. The challenge of detecting molecules that approach and exceed the pore diameter is also addressed.
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Yiliang Zhao, Gilberto A. Rodriguez, Yasmin M. Graham, Tengfei Cao, Girija Gaur, and Sharon M. Weiss "Resonant photonic structures in porous silicon for biosensing", Proc. SPIE 10081, Frontiers in Biological Detection: From Nanosensors to Systems IX, 100810D (23 February 2017);

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