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Proceedings Paper

High yield silicon photonic crystal microcavity biosensors with 100fM detection limit
Author(s): Yi Zou; Swapnajit Chakravarty; Wei-Cheng Lai; Cheng-Chih Hsieh; Ray T. Chen
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Paper Abstract

We experimentally demonstrated a silicon photonic crystal (PC) microcavity biosensor with 50 femto-molar detection limit. Our devices have demonstrated sensitivities higher than than competing optical platforms at concentration of 0.1μg/ml across a range of dissociation constants KD 1 micro-molar to 1 femto-molar. High sensitivities were achieved by slow light engineering which reduced the radiation loss and increased the stored energy in the PC microcavity resonance mode which contributed to high Q as well as enhanced optical mode overlap with the analyte. By integrating subwavelength grating coupler, we showed that not only coupling efficiency increased but also the working device yield significantly improved

Paper Details

Date Published: 5 March 2013
PDF: 7 pages
Proc. SPIE 8570, Frontiers in Biological Detection: From Nanosensors to Systems V, 857008 (5 March 2013); doi: 10.1117/12.2005149
Show Author Affiliations
Yi Zou, The Univ. of Texas at Austin (United States)
Swapnajit Chakravarty, Omega Optics, Inc. (United States)
Wei-Cheng Lai, The Univ. of Texas at Austin (United States)
Cheng-Chih Hsieh, The Univ. of Texas at Austin (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 8570:
Frontiers in Biological Detection: From Nanosensors to Systems V
Benjamin L. Miller; Philippe M. Fauchet, Editor(s)

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