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Nano-Photonics: Plasmonics and Hyperbolic Metamaterial

Nano-photonics or nano-optics is the study of light at the nanoscale where light-matter interaction gives rise to exciting novel phenomena. The entire filed of nano-optics have generated tremendous interest in recent years as the very basic building blocks of the laws of physical optics which lasted for centuries are now being challenged, replaced by more advanced and sophisticated theories, and verified by ground breaking experiments.

Our interest in Nano-photonics is to develop nitride based plasmonic materials and metamaterials. Currently we are working on a new class of plasmonic metamaterials known as hyperbolic metamaterial based on TiN/(Al,Sc)N superlattices. The p-polarised light inside a hyperbolic medium shows hyperbolic iso-frequency surface which gives rise to many exotic phenomena like divergence of photonic densities of states, negative refraction, and others. Recent theoretical calculations have also suggested that the hyperbolic medium should also show giant increase in the rediation part of the thermal conductivity known as the Hyperthermal conductivity. Please refer to the following papers for more information.



1. Titanium nitride-based metamaterial for spontaneous emission rate engineering, Gururaj V. Naik, Bivas Saha, Jing Liu, Sammy M. Saber, Eric Stach, Joseph MK Irudayaraj, Timothy D. Sands, Vladimir M. Shalaev and Alexandra Boltasseva (Under Review).

2. TiN/(Al,Sc)N metal/dielectric superlattices as a hyperbolic metamaterial in the visible spectral range. Bivas Saha, Gururaj V. Naik, Sammy M. Saber, Eric Stach, Timothy D. Sands, Vladimir M. Shalaev and Alexandra Boltasseva (Under Preparation).

Collaborators: Gururaj Naik (Purdue), Alexandra Boltasseva (Purdue), Vlad Shalaev (Purdue)