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Fiber-coupled dielectric-loaded plasmonic waveguides.

Jacek Gosciniak¹, Valentyn S Volkov, Sergey I Bozhevolnyi

¹Institute of Sensors, Signals and Electrotechnics, University of Southern Denmark, Niels Bohrs Allé 1, DK-5230 Odense M, Denmark.

|April 15, 2010

Summary

Efficient fiber coupling for dielectric-loaded surface plasmon-polariton waveguides (DLSPPWs) was achieved using tapered dielectric waveguides. This method demonstrates low insertion loss for integrated photonic devices at telecom wavelengths.

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Area of Science:

Photonics and Nanophotonics
Integrated Optics
Plasmonics

Background:

Dielectric-loaded surface plasmon-polariton waveguides (DLSPPWs) offer unique light-guiding properties.
Efficient fiber coupling is crucial for practical applications of plasmonic waveguides.

Purpose of the Study:

To demonstrate efficient fiber in- and out-coupling for DLSPPWs.
To characterize the performance of DLSPPWs for integrated photonic applications.

Main Methods:

Fabrication of DLSPPW structures using large-scale UV-lithography.
Utilizing intermediate tapered dielectric waveguides for fiber coupling.
Characterization via fiber-to-fiber transmission measurements at telecom wavelengths.

Main Results:

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Achieved fiber coupling to DLSPPWs using tapered dielectric waveguides.
Demonstrated overall insertion loss below 24 dB for straight and bent waveguides.
Identified DLSPPW propagation loss over 100-microm distance as a significant factor.

Conclusions:

Tapered dielectric waveguides enable efficient fiber coupling to DLSPPWs.
The developed structures show potential for integrated photonic circuits.
Further optimization can reduce propagation losses in DLSPPWs.