Active tuning of ENZ resonances in meta-antenna through phase modulation of optical pulse

TL;DR

This paper demonstrates active tuning of epsilon-near-zero resonances in plasmonic nanoantennas by phase modulation of optical pulses, enabling dynamic control of optical properties without specialized ENZ materials.

Contribution

It introduces a novel phase modulation technique to actively tune ENZ resonances in nanoantennas using quantum mechanical analysis and FDTD simulations.

Findings

Significant spectral shift in ENZ modes achieved

Active tuning of ENZ frequency via phase control

Potential applications in photonic circuits and quantum technologies

Abstract

Plasmonic nanoantennas offer new avenues to manipulate the propagation of light in materials due to their near field enhancement and ultrafast response time. Here we investigate the epsilon-near-zero (ENZ) response in an L-shaped nanoantenna structure under the phenomenon of plasmonic analog of enhancement in the index of refraction. Using a quantum mechanical approach, we analyze the modulation in the response of probe field and emergence of ENZ frequency region both in the linear and nonlinear plasmonic system. We also demonstrate the active tuning of ENZ frequency region in a nanoantenna structure by modulating the phase of control pulse. The analytical and 3D FDTD simulation results show a significant spectral shift in the ENZ modes. Our proposed method offers the possibility to design and control optical tunable ENZ response in plasmonic metasurfaces without the use of ENZ material. Such metasurfaces can be used in on-chip photonic integrated circuits, further localization of incident fields, slow light operations and various quantum technologies.