Abstract

Sensors based on the response of the photonic crystal in imprint polymers (hydrogels) have recently attracted considerable attention for visual medical diagnostics, pharmaceutical bioassays, environmental monitoring, and nanoparticle detection. These applications often use the variation of the wavelength as a function of the diameter of the air sphere (inverse opal hydrogels) according to the Bragg equation at a fixed incident angle. However, these promising materials mixed with fluorescent nanocrystals for the detection of targeted nanoparticles have never been explored so far with the finite differential time-domain (FDTD) method, electric field intensity map, and radiated power profile at far-field. In this paper, we have combined silicon nanopillars, nanoparticles, imprint polymers, and nanocrystal fluorescence. The sensitivity of the sensor we simulate depends on the nanocrystal fluorescence variation when the imprint polymer swells (polymer thickness variation). We have shown numerically that the electric field intensity at far-field is at a maximum in the pillar’s symmetrical axis when the dipole (representing the nanocrystal) polarization is perpendicular to the pillar. Also, we have shown that radiated power is increasing and monotone when the thickness of the imprint polymer evolves between 498 and 912 nm. The purpose of this numerical simulation is to develop a nanoparticle sensor with high sensitivity, high selectivity, and an efficient detection device.

© 2020 Optical Society of America

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