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Waveguide efficient directional coupling and decoupling via an integrated plasmonic nanoantenna.

Guillaume Blanquer, Vivien Loo, Nancy Rahbany

|October 7, 2021

Summary

This study characterizes a hybrid dielectric/plasmonic waveguide for enhanced light-matter interaction. The device demonstrates strong directionality, enabling efficient coupling between single emitters and optical waveguides.

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Area of Science:

Nanoscale light-matter interaction
Integrated photonics
Plasmonics

Background:

Advancements in integrated photonic devices are crucial for nanoscale light-matter interaction.
Efficient optical confinement and propagation require effective coupling between single photon emitters and optical waveguides.

Purpose of the Study:

To characterize a hybrid dielectric/plasmonic waveguide for enhanced light confinement and propagation.
To demonstrate the strong directionality of a gold triangular nanoantenna on a TiO2 waveguide.
To highlight the plasmonic antenna's capability for strong coupling between single emitters and waveguides.

Main Methods:

Experimental characterization of a hybrid waveguide.
Utilizing a gold triangular nanoantenna on a TiO2 waveguide.

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Comparing scattered intensity with a Scanning Near-field Optical Microscopy (SNOM) tip under different illumination geometries.

Numerical simulations to analyze coupling efficiency.

Main Results:

Experimental demonstration of strong directionality in the hybrid device.
Quantification of directionality by comparing scattered light intensity.
Numerical evidence of the plasmonic antenna's ability to generate powerful coupling.

Conclusions:

The hybrid dielectric/plasmonic waveguide exhibits strong directionality.
This device architecture is effective for achieving efficient coupling between single emitters and optical waveguides.
The findings contribute to advancements in integrated photonics for nanoscale applications.