Photonic Sensors

, Volume 7, Issue 3, pp 217–225 | Cite as

A study on refractive index sensors based on optical micro-ring resonators

Open Access
Regular

Abstract

In this work, the behavior of refractive index sensors based on optical micro-ring resonators is studied in detail. Using a result of waveguide perturbation theory in combination with numerical simulations, the optimum design parameters of the system, maximizing the sensitivity of the sensor, are determined. It is found that, when optimally designed, the sensor can detect relative refractive index changes of the order of Δn/n≈3×10−4, assuming that the experimental setup can detect relative wavelength shifts of the order of Δλ/λ≈3×10−5. The behavior of the system as bio-sensor has also been examined. It is found that, when optimally designed, the system can detect refractive index changes of the order of Δn≈10−3 for a layer thickness of t=10 nm, and changes in the layer thickness of the order of λt≈0.24 nm, for a refractive index change of Δn=0.05.

Keywords

Optical micro-ring resonators refractive index sensors bio-sensors nano-photonic sensors 

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Copyright information

© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.Department of Physics, School of Applied Mathematical and Physical SciencesNational Technical University of Athens, Zografou CampusZografou, AthensGreece

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