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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Theory of plasmon reflection by a 1D junction
Optics Express
|August 19, 2018
Summary
We studied plasmon wave reflection from 1D junctions in 2D sheets. Narrow junctions show near-perfect reflection due to capacitive coupling, unaffected by damping, crucial for plasmonic circuits.
Area of Science:
- Condensed matter physics
- Plasmonics
- Nanophotonics
Background:
- Plasmon waves are crucial for nanoscale electronic devices.
- Understanding wave reflection at junctions is key for circuit design.
- Low-conductivity junctions present unique challenges for plasmon propagation.
Purpose of the Study:
- To comprehensively study the reflection of normally incident plasmon waves from low-conductivity 1D junctions in 2D conductive sheets.
- To analytically derive results for both wide and narrow junction limits.
- To identify the key phenomena governing plasmon reflection at these junctions.
Main Methods:
- Rigorous analytical derivation of reflection coefficients.
- Analysis in the limits of wide and narrow junctions.
- Investigation of cavity resonances and capacitive coupling effects.
Main Results:
- Two phenomena dictate reflectance: cavity resonances and capacitive coupling.
- Cavity resonances cause alternating strong/weak reflection, susceptible to damping.
- Capacitive coupling in narrow junctions (<1/10 plasmon wavelength) provides damping-immune, near-perfect plasmon reflection.
Conclusions:
- Plasmonic damping significantly impacts resonance-based reflection.
- Capacitive coupling offers a robust mechanism for high plasmon reflection in narrow junctions.
- Findings are vital for designing infrared 2D plasmonic circuits and nanoscale terahertz detectors.
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