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Localized surface plasmon mode-enhanced spectrum-tunable radiation in electrically driven plasmonic antennas
Optics Letters
|October 1, 2020
Summary
Researchers developed a spectrum-tunable light source using electrically driven tunnel junctions. Localized surface plasmon modes in bowtie antennas enable precise color tuning for on-chip information processing.
Area of Science:
- Photonics
- Plasmonics
- Optoelectronics
Background:
- On-chip information processing demands compact, spectrum-tunable light sources.
- Electrically driven tunnel junctions are a promising technology for light emission.
Purpose of the Study:
- To investigate spectrum-tunability in light emission from metal-insulator-metal tunnel junctions.
- To explore the role of plasmonic antennas in controlling light emission spectra.
Main Methods:
- Fabrication of a gap bowtie antenna-based metal-insulator-metal junction.
- Electroluminescence spectroscopy to analyze light emission.
- Finite difference time domain (FDTD) calculations and scanning tunneling microscopy (STM) theory for numerical and analytical confirmation.
Main Results:
- Multiple peaks were observed in the electroluminescence spectrum, attributed to resonant plasmon modes.
- Localized surface plasmon modes were tunable by altering antenna gap distances and geometries.
- Demonstrated a method for achieving spectrum-tunable light emission.
Conclusions:
- Plasmonic resonant modes in bowtie antennas enable fine-tuning of light emission spectra.
- This approach offers a pathway towards developing spectrum-tunable, electrically driven light sources for photonic devices.
