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Open AccessFeature PaperArticle

Evanescent Properties of Optical Diffraction from 2-Dimensional Hexagonal Photonic Crystals and Their Sensor Applications

Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 1kin6, Taiwan
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Materials 2018, 11(4), 549; https://doi.org/10.3390/ma11040549
Received: 1 March 2018 / Revised: 30 March 2018 / Accepted: 2 April 2018 / Published: 3 April 2018
(This article belongs to the Special Issue Photonic Crystals for Chemical Sensing and Biosensing)
The sensitivity of traditional diffraction grating sensors is limited by the spatial resolution of the measurement setup. Thus, a large space is required to improve sensor performance. Here, we demonstrate a compact hexagonal photonic crystal (PhC) optical sensor with high sensitivity. PhCs are able to diffract optical beams to various angles in azimuthal space. The critical wavelength that satisfies the phase matching or becomes evanescent was used to benchmark the refractive index of a target analyte applied on a PhC sensor. Using a glucose solution as an example, our sensor demonstrated very high sensitivity and a low limit of detection. This shows that the diffraction mechanism of hexagonal photonic crystals can be used for sensors when compact size is a concern. View Full-Text
Keywords: hexagonal photonic crystal; sensor hexagonal photonic crystal; sensor
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MDPI and ACS Style

Liao, Y.-Y.; Chen, Y.-T.; Chen, C.-C.; Huang, J.-J. Evanescent Properties of Optical Diffraction from 2-Dimensional Hexagonal Photonic Crystals and Their Sensor Applications. Materials 2018, 11, 549.

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