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Standing Waves in a Cavity

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Wavelength-selective directional coupling with dielectric-loaded plasmonic waveguides.

Zhuo Chen¹, Tobias Holmgaard, Sergey I Bozhevolnyi

¹Department of Physics and Nanotechnology, Aalberg University, Aalborg Øst, Denmark.

|February 3, 2009

Summary

This study demonstrates wavelength-selective splitting of radiation using dielectric-loaded surface-plasmon-polariton waveguides (DLSPPWs). These directional couplers (DCs) show promise for separating optical signals at different wavelengths.

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Area of Science:

Plasmonics and Nanophotonics
Optical Waveguide Devices
Integrated Optics

Background:

Directional couplers (DCs) are fundamental components in integrated optics for splitting and combining optical signals.
Surface-plasmon-polariton waveguides offer potential for miniaturized optical devices due to sub-wavelength confinement.
Dielectric loading of surface-plasmon-polariton waveguides can enhance their performance and integration capabilities.

Purpose of the Study:

To investigate wavelength-selective radiation splitting using dielectric-loaded surface-plasmon-polariton waveguides (DLSPPWs).
To design and fabricate DLSPPW-based directional couplers for optical signal separation.
To characterize the performance of these devices at telecommunication wavelengths.

Main Methods:

Fabrication of DLSPPWs by depositing sub-wavelength polymer ridges on a gold film using large-scale UV photolithography.
Characterization of directional couplers using near-field microscopy at telecommunication wavelengths.
Full vectorial three-dimensional finite-element simulations for device performance prediction and validation.

Main Results:

Demonstrated a 45-microm-long DLSPPW directional coupler exhibiting a transition from 'through' state at 1500 nm to 3 dB splitting at 1600 nm.
Simulated a 50.5-microm-long DLSPPW directional coupler capable of complete separation of radiation channels at 1400 nm and 1620 nm.
Experimental results showed good agreement with theoretical simulations.

Conclusions:

DLSPPW-based directional couplers are effective for wavelength-selective splitting of optical radiation.
The demonstrated devices show potential for applications in optical signal processing and wavelength demultiplexing.
UV photolithography is a viable technique for fabricating these nanoscale optical components.