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Photonic Crystal Nanobeam Cavities for Nanoscale Optical Sensing: A Review

State Key Laboratory of Information Photonics and Optical Communications, and School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
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Micromachines 2020, 11(1), 72; https://doi.org/10.3390/mi11010072
Received: 5 December 2019 / Revised: 6 January 2020 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Photonic Crystal Microsensors)
The ability to detect nanoscale objects is particular crucial for a wide range of applications, such as environmental protection, early-stage disease diagnosis and drug discovery. Photonic crystal nanobeam cavity (PCNC) sensors have attracted great attention due to high-quality factors and small-mode volumes (Q/V) and good on-chip integrability with optical waveguides/circuits. In this review, we focus on nanoscale optical sensing based on PCNC sensors, including ultrahigh figure of merit (FOM) sensing, single nanoparticle trapping, label-free molecule detection and an integrated sensor array for multiplexed sensing. We believe that the PCNC sensors featuring ultracompact footprint, high monolithic integration capability, fast response and ultrahigh sensitivity sensing ability, etc., will provide a promising platform for further developing lab-on-a-chip devices for biosensing and other functionalities. View Full-Text
Keywords: photonic crystal nanobeam cavity; optical sensor; sensing mechanisms; refractive index sensing; nanoparticle detection; biomolecule detection; multiplexed sensing photonic crystal nanobeam cavity; optical sensor; sensing mechanisms; refractive index sensing; nanoparticle detection; biomolecule detection; multiplexed sensing
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Yang, D.-Q.; Duan, B.; Liu, X.; Wang, A.-Q.; Li, X.-G.; Ji, Y.-F. Photonic Crystal Nanobeam Cavities for Nanoscale Optical Sensing: A Review. Micromachines 2020, 11, 72.

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