研究目的
Investigating the coupling between plasmonic nanohole array and nanorod arrays and the emergence of a new extraordinary optical transmission mode and epsilon-near-zero property.
研究成果
The dis-NRinNH structure has a new EOT mode when the polarization of incident light is along the long axis of NRs. This new mode possesses high local E-fields and enhances propagating waves at the same time. The NR inside the NH acts as a nanoantenna and the length of the NR determines the resonance radiation wavelength, which offers a unique way to tune the EOT resonance wavelength of fixed NH arrays.
研究不足
The tunability of the new EOT mode comes with a cost, i.e., the real part of the effective permittivity increases with the nanorod length, which means longer rod will cause a higher optical loss at the ENZ region.
1：Experimental Design and Method Selection:
Finite-difference-time-domain (FDTD) calculations were used to investigate the optical properties of the compound Ag nanohole structures with an Ag nanorod in the middle of an Ag nanohole.
2：Sample Selection and Data Sources:
The structure consists of a NR with a length l and width w in the center of a NH with a diameter D. The layer thickness h for both the NR and NH was fixed to be 90 nm.
3：List of Experimental Equipment and Materials:
A commercial software package (FDTD Solutions, Lumerical Solutions Inc.) was used for calculations.
4：Experimental Procedures and Operational Workflow:
A broadband linear polarized light source was used and the angle between the E-field and the long axis of NRs was varied from 0° to 180°.
5：0°. Data Analysis Methods:
5. Data Analysis Methods: The obtained E-fields were normalized to the magnitude of the incident E-fields.
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