Plasmon tuning in ultra-thin titanium nitride films

Abstract

We investigated theoretically the scopes and variables of plasmonic property tuning for ultra-thin films consisting of alternative plasmonic materials. The extension of Mie theory suggests a great dependency of particle shape on localized surface plasmon resonance (LSPR) frequency. This work focuses on the LSPR tuning potentials of alternate plasmonic materials. Moreover, the carrier concentration via external biasing directly controls the permittivity profile resulting in the shift of plasmonic resonance. Here, we reported LSPR tuning possibilities by alternative plasmonic materials, titanium nitride (TiN). A comparative analysis of transmission and absorption property dependency of Au and TiN-based nanostructures was presented. Moreover, the effect of nanostructure shape and size, charge density, and incident light polarization was simulated in this work. Most importantly, around 30% of transmittance modulation was observed by varying the carrier concentration, which will illustrate the major determinants and scopes for further study. Moreover, our results extracted from rigorous simulation will be beneficial in incorporating TiN in widespread plasmonic applications such as electro-optic modulation and detection.