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Designing an all-optical biosensor using photonic crystal



  1. Department of Electrical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran


In this paper, we designed a small-size biosensor to detect the DNA molecules using a 2D hexagonal photonic crystal without any change in the radius of the holes. The sensing mechanism is based on the change in the refractive index of sensing holes and the intensity variation of the output transmission spectrum. By infiltrating the analyte within the sensing holes for one unit change in the refractive index, the normalized intensity of the transmission spectrum is reduced to 4 units. To analyze the performance of this structure, we used the plane wave expansion and the finite difference time domain methods. The regression coefficient is equal to -0.9689..


Biosensor, Photonic crystal, Resonant cavities, Intensity variation.

Submitted at: July 28, 2020
Accepted at: June 7, 2022


MAHSA BAZARGANI, BEHNAZ GHAREKHANLOU, MEHDI BANIHASHEMI, Designing an all-optical biosensor using photonic crystal, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 5-6, pp. 206-210 (2022)