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Micromachines 2018, 9(2), 54; https://doi.org/10.3390/mi9020054

High-Q Fabry–Pérot Micro-Cavities for High-Sensitivity Volume Refractometry

1
Université Paris-Est, ESIEE Paris, ESYCOM EA 2552, 93162 Noisy-le-Grand, France
2
Center for nanotechnology, Zewail City of Science and Technology, Sheikh Zayed District, 6th of October City 12588, Giza, Egypt
3
Faculty of Engineering, Ain-Shams University, 1 Elsarayat St., Abbassia, Cairo 11517, Egypt
*
Author to whom correspondence should be addressed.
Received: 25 November 2017 / Revised: 22 December 2017 / Accepted: 24 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Photonic MEMS and Optofluidic Devices)
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Abstract

This work reports a novel structure for a Fabry–Pérot micro cavity that combines the highest reported quality factor for an on-chip Fabry–Pérot resonator that exceeds 9800, and a very high sensitivity for an on-chip volume refractometer based on a Fabry–Pérot cavity that is about 1000 nm/refractive index unit (RIU). The structure consists of two cylindrical Bragg micromirrors that achieve confinement of the Gaussian beam in the plan parallel to the chip substrate, while for the perpendicular plan, external fiber rod lenses (FRLs) are placed in the optical path of the input and the output of the cavity. This novel structure overcomes number of the drawbacks presented in previous designs. The analyte is passed between the mirrors, enabling its detection from the resonance peak wavelengths of the transmission spectra. Mixtures of ethanol and deionized (DI)-water with different ratios are used as analytes with different refractive indices to exploit the device as a micro-opto-fluidic refractometer. The design criteria are detailed and the modeling is based on Gaussian-optics equations, which depicts a scenario closer to reality than the usually used ray-optics modeling. View Full-Text
Keywords: Fabry–Pérot cavity; optical micro cavity; on-chip refractometer; refractive index measurement; stable optical resonator; optofluidic sensor; lab-on-a-chip Fabry–Pérot cavity; optical micro cavity; on-chip refractometer; refractive index measurement; stable optical resonator; optofluidic sensor; lab-on-a-chip
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gaber, N.; Sabry, Y.M.; Erfan, M.; Marty, F.; Bourouina, T. High-Q Fabry–Pérot Micro-Cavities for High-Sensitivity Volume Refractometry. Micromachines 2018, 9, 54.

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