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

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Efficient low dispersion compact plasmonic-photonic coupler.

T P H Sidiropoulos¹, S A Maier, R F Oulton

¹Department of Physics, Imperial College London, London SW7 2AZ, UK.

|June 21, 2012

Summary

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We achieved efficient, low-dispersion light coupling into silicon waveguides using metallic nanoparticle antennas. Strong scattering and directionality interplay limits transmission to 30% in one direction, enabling short pulse coupling.

Area of Science:

Nanophotonics
Optoelectronics
Materials Science

Background:

Efficient light coupling into silicon waveguides is crucial for integrated photonics.
Metallic nanoparticles offer unique light-matter interaction properties for optical manipulation.

Purpose of the Study:

To investigate efficient low-dispersion light coupling into silicon waveguides.
To explore the role of nanoparticle antennas in controlling light coupling.
To analyze the trade-off between directionality and efficiency in light coupling.

Main Methods:

Utilized a two-metallic-nanoparticle antenna design for light coupling.
Employed a dipole model to analyze scattering phenomena.
Investigated coupling efficiency and directionality across a 500 nm bandwidth.

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

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

Published on: July 8, 2013

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

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Main Results:

Strong multiple scattering between nanoparticles significantly influences coupling efficiency.
Optimizing directionality led to decreased coupling efficiency.
Achieved up to 30% transmission into a single direction due to a balance between scattering and directionality.
Demonstrated low group delay dispersion for coupling pulses as short as 50 fs.

Conclusions:

Metallic nanoparticle antennas can enable efficient, low-dispersion light coupling into silicon waveguides.
Multiple scattering and directional control present a fundamental trade-off in antenna design.
The reported system is suitable for high-speed optical communication applications.