Sinergia di Plasmoni Superficiali Polaritoni e Cristalli Fotonici per un'Emissione Migliorata nell'Applicazione di Biosensori = Synergy of Surface Plasmon Polaritons and Photonic Crystals for Enhanced Emission in Biosensing Application

By coupling localised and propagating surface plasmon modes within photonic band gap effects, researchers have demonstrated enhanced fluorescence, spontaneous emission rates, and nonlinear optical responses. To enhance and direct molecular emission from up-conversion nanoparticles (UCNPs), we investigate a new strategy of coupling gold plasmonic gratings with one-dimensional photonic crystals (1D PhCs). The multilayers act as optical mirrors, suppressing unwanted transmission and boosting excitation and emission efficiency through directionality, while plasmonic effects amplify localised field in excitation. COMSOL simulations revealed optimal design for our fabricated nanophotonic device by calculating determining parameters in grating and multilayer (ML) structures and analyzing how grating periodicity, PhC thickness, and nanoparticles’ location influence resonances in excitation and emission enhancement, making it a promising candidate for various spectroscopic applications, particularly in the field of biosensing.