Induced transparency by coupling of Tamm and defect states in tunable terahertz plasmonic crystals

TL;DR

This paper demonstrates a tunable terahertz plasmonic crystal system where coupling between Tamm and defect states induces transparency, enabling active control of plasmonic dispersion with potential applications in infrared photonics.

Contribution

It introduces a reconfigurable terahertz plasmonic crystal with coupled Tamm and defect states, demonstrating a novel frequency agile transparency effect.

Findings

Achieved 50% in-situ tuning of plasmonic band edges.

Observed weakly localized Tamm surface states.

Demonstrated active control of plasmonic dispersion.

Abstract

Photonic crystals and metamaterials have emerged as two classes of tailorable materials that enable precise control of light. Plasmonic crystals, which can be thought of as photonic crystals fabricated from plasmonic materials, Bragg scatter incident electromagnetic waves from a repeated unit cell. However, plasmonic crystals, like metamaterials, are composed of subwavelength unit cells. Here, we study terahertz plasmonic crystals of several periods in a two dimensional electron gas. This plasmonic medium is both extremely subwavelength ($\approx \lambda/100$) and reconfigurable through the application of voltages to metal electrodes. Weakly localized crystal surface states known as Tamm states are observed. By introducing an independently controlled plasmonic defect that interacts with the Tamm states, we demonstrate a frequency agile electromagnetically induced transparency phenomenon. The observed 50% ${\it in-situ}$ tuning of the plasmonic crystal band edges should be realizable in materials such as graphene to actively control the plasmonic crystal dispersion in the infrared.