Meta-nonlinearity and explanation for pulsed light transmission through a subwavelength plasmonic slit
Kuan-Ren Chen1*, Jian-Shiung Hong1, Alex E. Chen2
1Department of Physics, National Cheng Kung University, Tainan, Taiwan
2Department of Electrical Engineering, The Pennsylvania State University, University Park, PA, USA
* Presenter:Kuan-Ren Chen,
The transmission of a light pulse through a subwavelength plasmonic slit remains as a fundamental physics puzzle. We show that nonlinearity can be induced in this system even considering only linear materials and processes. Intriguing transient behavior, step phasor, non-smoothness, nonlinear phase shift(s), non-uniform dispersion and sub-pulse spreading are key features. The wave function of the transmitted field is highly sensitive to the phase delay due to the roundtrip reflection within the slit; especially, at half or integer periods. Analytical models are proposed to understand the underneath new physics. Modeling results agree well with simulations.

Keywords: nonlinearity, subwavelength, plasmonics, phase, analytical model