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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Optically Thin Metallic Films for High-Radiative-Efficiency Plasmonics.

Yi Yang¹, Bo Zhen^1,2, Chia Wei Hsu³

¹Research Laboratory of Electronics, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.

|June 1, 2016

Summary

This summary is machine-generated.

Optically thin metallic films offer a novel platform for plasmonics, enhancing light concentration for both scattering and spontaneous emission. This approach overcomes limitations of nanoparticles and films, enabling high-efficiency light manipulation.

Keywords:

light scattering metallic thin film nanoparticles optical nanoantennas radiative efficiency spontaneous emission

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Area of Science:

Plasmonics
Optics
Materials Science

Background:

Plasmonics utilizes metallic nanoparticles and films for light manipulation, but faces challenges with material quality (nanoparticles) or radiation coupling (films).
Existing plasmonic platforms have limitations in achieving both high material quality and efficient light interaction.

Purpose of the Study:

To theoretically investigate optically thin metallic films as an improved platform for high-radiative-efficiency plasmonics.
To explore the potential of thin metallic films for enhanced far-field scattering and near-field spontaneous emission.

Main Methods:

Theoretical investigation of optically thin metallic films.
Analysis of light scattering and spontaneous emission properties.
Modeling of field overlap and enhancement factors.

Main Results:

Optically thin metallic films with a high-quality substrate enhance far-field scattering quality factors while retaining nanoparticle benefits.
Thin metallic substrates significantly improve emitter-plasmon coupling for spontaneous emission, achieving high Purcell factors (>10^4) and quantum yields (>50%).
Near-field enhancement is efficient even at vanishing gap sizes (3-5 nm) without common quenching effects.

Conclusions:

Optically thin metallic films present an ideal platform for high-radiative-efficiency plasmonics.
This approach overcomes limitations of traditional plasmonic platforms, offering enhanced light concentration and emission properties.
The proposed platform enables efficient light-matter interactions for fundamental studies and advanced applications.