Engineering novel tunable optical high-Q nanoparticle array filters for a wide range of wavelengths
Anton D. Utyushev, I. L. Isaev, V. S. Gerasimov, A. E. Ershov, Vadim I. Zakomirnyi, Ilia L. Rasskazov, Sergey P. Polyutov, Hans Ågren, С. В. Карпов
Abstract
The interaction of non-monochromatic radiation with arrays comprising plasmonic and dielectric nanoparticles has been studied using the finite-difference time-domain electrodynamics method. It is shown that LiNbO 3 , TiO 2 , GaAs, Si, and Ge all-dielectric nanoparticle arrays can provide a complete selective reflection of an incident plane wave within a narrow spectral line of collective lattice resonance with a Q-factor of 10 3 or larger at various spectral ranges, while plasmonic refractory TiN and chemically stable Au nanoparticle arrays provide high-Q resonances with moderate reflectivity. Arrays with fixed dimensional parameters make it possible to fine-tune the position of a selected resonant spectral line by tilting the array relative to the direction of the incident radiation. These effects provide grounds for engineering novel selective tunable optical high-Q filters in a wide range of wavelengths, from visible to middle-IR.