High-sensitive symmetric Fano optical cavity sensor for refractive index detection based on photonic crystal structure

mohammad hasan rezaei | Mohammad Hasan yavari

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=158857
Date :  2021/05/18
Publish in :    بيست نهمين کنفرانس مهندسي برق


Keywords :optical sensor, Fano resonance, refractive index sensor, photonic crystal sensor

Abstract :

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We have designed an ultra-high quality factor (Q) and sensitivity photonic crystal (PhC) Fano sensor. By engineering of Fano cavity within a typical Fano structure, the light modes penetrated into the lower index region of the Fano cavity and the sensitivity as well as Q is increased. The transmission spectrum of the presented sensor is calculated by FDTD simulation and the theoretical model of the structure is investigated. A sensitivity and Q of 528 nm/RIU and
×  have been demonstrated, respectively. To the best of our knowledge, this is the first device with figure of merit (FOM) of 1820 that shows high sensitivity and ultra-high Q simultaneously, while using Fano resonance in output.