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Substrate engineering of plasmonic nanocavity antenna modes
Optics Express
|February 14, 2023
Summary
Substrate properties offer new ways to tune plasmonic nanocavities for quantum technologies. Highly refractive or absorptive substrates enhance light-matter interactions for 2D quantum materials.
Area of Science:
- Nanophotonics
- Quantum Optics
- Materials Science
Background:
- Plasmonic nanocavities offer nanoscale light manipulation for spectroscopy and quantum information.
- Engineering nanocavity modes is crucial for strong light-matter interactions with quantum emitters.
Purpose of the Study:
- To explore how substrate material properties influence plasmonic nanocavity modes.
- To identify substrate characteristics for optimizing coupling with 2D quantum materials.
Main Methods:
- Utilized a gold bowtie nanoantenna model.
- Investigated the effect of substrate complex refractive index (n + ik) on nanocavity modes.
- Performed theoretical predictions of mode characteristics.
Main Results:
- Substrate refractive index offers design flexibility for nanocavity resonance, hotspot location, polarization, and decay rates.
- Highly refractive (n ≥ 4) or absorptive (k ≥ 4) substrates create desirable modes for 2D quantum materials.
- Predicted modes feature elevated hotspots, in-plane polarization, and strong radiative properties.
Conclusions:
- Substrate engineering is an underutilized method for plasmonic nanocavity control.
- This approach enables advanced plasmonic cavity quantum electrodynamics with 2D materials.
