研究目的
Investigating the electrically driven broadband light emission induced by electron tunneling in plasmonic nanorod metamaterials.
研究成果
The study demonstrates a flexible electrically driven nanorod metamaterial platform for integrated and free-space nanoscale light sources. The emission spectrum can be engineered through the control of the metamaterial's geometrical parameters, offering potential applications in integrated nanophotonics, imaging, metrology, and optical sensing platforms.
研究不足
The study is limited by the spectral widths of the modes and the overlap between waveguided and MIM modes, which may affect the clarity of mode identification and the efficiency of energy channeling.
1：Experimental Design and Method Selection:
The study utilized gold nanorod metamaterials fabricated by electrodeposition into porous alumina templates on a silica substrate. The metamaterial's optical properties were characterized using effective medium theory. Tunnel junctions were constructed at the nanorod tips with a monolayer of poly-l-histidine as a dielectric spacer and a eutectic gallium indium top electrode.
2：Sample Selection and Data Sources:
A metamaterial with specific nanorod dimensions was employed. The emission spectra were measured under various biases and angles of observation.
3：List of Experimental Equipment and Materials:
Gold nanorod metamaterials, poly-l-histidine monolayer, eutectic gallium indium electrode, silica substrate.
4：Experimental Procedures and Operational Workflow:
The emission from the tunneling current was measured in the far field, and the modal structure of the metamaterial was probed via reflectivity measurements.
5：Data Analysis Methods:
Numerical simulations in the frequency domain were performed to model the tunneling-induced emission, with the tunneling current represented by a dipolar source.
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