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Sensors 2017, 17(8), 1861; doi:10.3390/s17081861

Optical Refractive Index Sensing Based on High-Q Bound States in the Continuum in Free-Space Coupled Photonic Crystal Slabs

Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
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Received: 30 June 2017 / Revised: 5 August 2017 / Accepted: 9 August 2017 / Published: 11 August 2017
(This article belongs to the Special Issue Silicon Technologies for Photonic Sensors)
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Abstract

High sensitivity (S) and high quality factor (Q) are desirable to achieve low detection limit in label-free optical sensors. In this paper, we theoretically demonstrate that single-layer and coupled bi-layer photonic crystal slabs (PCS) possess simultaneously high S and high Q near the bound states in the continuum (BIC). We theoretically achieved S > 800 nm/RIU and Q > 107 in refractive index sensing in the 1400–1600 nm telecom optical wavelength bands. We experimentally demonstrated an S of 94 nm/RIU and a Q of 1.2 × 104, with a detection limit of 6 × 10−5 refractive index unit. These sensor designs can find applications in biochemical sensing, environmental monitoring, and healthcare. View Full-Text
Keywords: optical sensor; Fano resonance; label-free sensor; photonic crystals; bound states in the continuum optical sensor; Fano resonance; label-free sensor; photonic crystals; bound states in the continuum
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Liu, Y.; Zhou, W.; Sun, Y. Optical Refractive Index Sensing Based on High-Q Bound States in the Continuum in Free-Space Coupled Photonic Crystal Slabs. Sensors 2017, 17, 1861.

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