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Single nanoparticle couplers for plasmonic waveguides.

Shunping Zhang¹, Changzhi Gu, Hongxing Xu

¹Beijing National Laboratory for Condensed, Matter Physics and Institute of Physics, Chinese Academy of Sciences, Box 603-146, Beijing, 100190, China; Center for Nanoscience and Nanotechnology and School of Physics and Technology, Wuhan University, Wuhan, 430072, China.

Small (Weinheim an Der Bergstrasse, Germany)

|July 22, 2014

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A single nanoparticle antenna efficiently couples light into plasmonic nanowire waveguides. Its surface plasmon resonances control light coupling, which can be enhanced or suppressed using a focused ion beam.

Area of Science:

Plasmonics
Nanophotonics
Optical Engineering

Background:

Plasmonic nanowire waveguides are crucial for nanoscale light manipulation.
Efficiently coupling light into these waveguides remains a challenge.

Purpose of the Study:

To investigate a single nanoparticle antenna as an efficient coupler for plasmonic nanowire waveguides.
To demonstrate control over light coupling into surface plasmon polaritons.

Main Methods:

Fabrication of a nanoparticle antenna using a focused ion beam.
Characterization of the antenna's surface plasmon resonances.
Analysis of light coupling into plasmonic nanowire waveguides.

Main Results:

The nanoparticle antenna acts as an efficient coupler.

Keywords:

coupler focus ion beam reflector self-aligned surface plasmons

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Light coupling can be suppressed or enhanced by tuning the nanoantenna's surface plasmon resonances.

The coupler is compact and controllable via focused ion beam.

Conclusions:

Single nanoparticle antennas offer a viable solution for controlled light coupling in plasmonic nanowire systems.
This compact and controllable coupler has implications for integrated nanophotonic devices.