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Published on: January 3, 2016

Plasmonic multi-mode interference couplers.

Yu-Ju Tsai¹, Aloyse Degiron, Nan M Jokerst

¹Center for Metamaterials and Integrated Plasmonics, Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.

|November 13, 2009

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This study demonstrates plasmonic multi-mode interference (MMI) couplers using gold stripes for telecommunication wavelengths. Despite material losses, these devices show promising results and potential applications.

Area of Science:

Photonics and Nanotechnology
Optoelectronics
Plasmonics

Background:

Plasmonic multi-mode interference (MMI) couplers are crucial for integrated optical circuits.
Investigating their performance at telecommunication wavelengths (1.55 µm) is essential for modern optical communication.
Metallic structures, like gold (Au) stripes, offer unique plasmonic properties but face challenges with material losses.

Purpose of the Study:

To numerically and experimentally investigate plasmonic MMI couplers.
To explore the feasibility of using thin gold stripes supporting long-range surface plasmons.
To assess the performance of these couplers despite inherent material losses.

Main Methods:

Numerical simulations to detail the operation principle of plasmonic MMI couplers.

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Fabrication of a series of MMI couplers using thin gold stripes.

Experimental characterization of the fabricated couplers.

Main Results:

Numerical simulations predicted useful effects from the plasmonic MMI couplers.
Experimental results showed quantitative agreement with numerical predictions.
Demonstrated the viability of gold stripes for supporting long-range surface plasmons in MMI couplers.

Conclusions:

Plasmonic MMI couplers using gold stripes are feasible for telecommunication applications.
Useful optical effects can be achieved even with inherent material losses in metallic plasmonic structures.
These structures have potential applications in integrated photonics and optical communication systems.