We report our recent development in pursuing high Quality-Factor (high-Q factor) plasmonic resonances, with vertically
aligned two dimensional (2-D) periodic nanorod arrays. The 2-D vertically aligned nano-antenna array can have high-Q
resonances varying arbitrarily from near infrared to terahertz regime, as the antenna resonances of the nanorod are highly
tunable through material properties, the length of the nanorod, and the orthogonal polarization direction with respect to
the lattice surface,. The high-Q in combination with the small optical mode volume gives a very high Purcell factor,
which could potentially be applied to various enhanced nonlinear photonics or optoelectronic devices. The 'hot spots'
around the nanorods can be easily harvested as no index-matching is necessary. The resonances maintain their high-Q
factor with the change of the environmental refractive index, which is of great interest for molecular sensing.
Transparent conducting oxides (TCOs), in general, are degenerated semiconductors with large electronic band-gap. They
have been widely used for display screens, optoelectronic, photonic, and photovoltaic devices due to their unique dual
transparent and conductive properties. In this study, we report in detail a technique that we developed to fabricate single
crystal TCO nanorod arrays with controlled conductivity, height, and lattice spacing in a simple one-zone tube furnace
system. We demonstrate how novel photonic/plasmonic properties can be obtained by selecting unique combinations of
these basic parameters of the nano-rod arrays.