研究目的
To investigate the transmission enhancement mechanisms in a plasmonic array having EOT response, by gain incorporation.
研究成果
The study concludes that the enhanced transmission is led by loss compensation in the plasmonic array with the nanoislands, whereas it is the background amplification of the gain which slightly enhances the transmission in the plasmonic array without the nanoislands. The difference between the two enhancement mechanisms lies on whether the gain is coupled to the plasmonic near field or not.
1：Experimental Design and Method Selection:
The study employs a self-consistent gain model to calculate the effective electric permittivity and investigates the optical response of an EOT system consisting of periodic apertures (nanocavities) and nanoislands, placed in the middle, where the gaps are filled with gain material.
2：Sample Selection and Data Sources:
The EOT system without the gain material is investigated by finite difference time domain (FDTD) simulations.
3：List of Experimental Equipment and Materials:
The simulations are performed in commercially available software, Lumerical FDTD, using tabulated experimental data for Au dielectric function.
4：Experimental Procedures and Operational Workflow:
A plane wave source, linearly polarized in the x direction and propagating in the z direction illuminates the unit cell of the nanostructure from the air side, and a monitor on the back side collects the transmitted fields.
5：Data Analysis Methods:
The effective parameters are retrieved using S-parameter inversion to analyze the system.
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