Ultrashort self-induced transparency plasmon solitons

Area of Science:

• Condensed Matter Physics
• Nonlinear Optics
• Plasmonics

Background:

• Surface plasmon polaritons (SPPs) are crucial for nanoscale optical phenomena.
• Understanding nonlinear effects in plasmonics is key for advanced optical devices.
• Gold films exhibit unique optical properties influenced by electron dynamics.

Purpose of the Study:

• To investigate the interband self-induced transmission of SPPs in a gold film.
• To model and predict the behavior of ultrashort plasmon solitons.
• To explore the role of external Kerr nonlinearity in controlling plasmon propagation.

Main Methods:

• Utilizing a generalized nonlinear Schrödinger equation for field envelope.
• Coupling the Schrödinger equation with Bloch equations for gold's valence electrons.
• Simulating optical propagation dynamics under nonlinear conditions.

Main Results:

• Prediction of self-induced transparency for ultrashort plasmon solitons (<10 fs).
• Demonstration of Kerr nonlinearity compensating for group velocity dispersion.
• Evidence of reduced dephasing and decay due to self-induced transmission.

Conclusions:

• Self-induced transmission offers a mechanism for generating and controlling ultrashort plasmon solitons.
• External nonlinear media can enhance plasmon propagation stability in gold films.
• The findings have implications for ultrafast plasmonics and optical signal processing.