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

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Slanted gold mushroom array: a switchable bi/tridirectional surface plasmon polariton splitter.

Yang Shen¹, Guisheng Fang², Alexander Cerjan³

¹State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China. jinchjun@mail.sysu.edu.cn and School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.

|August 16, 2016

Summary

This study introduces a novel switchable beam splitter for routing surface plasmon polaritons (SPPs) in photonic circuits. The device efficiently couples light and directs SPPs using polarization control, enabling advanced plasmonic integrated circuits.

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Area of Science:

Photonics and Nanotechnology
Optoelectronics
Plasmonics

Background:

Surface plasmon polaritons (SPPs) are crucial for miniaturizing integrated photonic circuits.
Efficient light coupling and routing of SPPs remain significant challenges in plasmonics.

Purpose of the Study:

To theoretically propose and experimentally demonstrate a switchable bi/tridirectional beam splitter for SPPs.
To enable simultaneous light coupling and SPP routing functionalities in a single device.

Main Methods:

Fabrication of a photonic device featuring a periodic array of slanted gold 'mushrooms' on a gold film.
Utilizing interference of in-plane guided modes scattered by dislocated gold gratings for unidirectional coupling.
Controlling the output channel via the polarization of the incident beam.

Main Results:

Demonstration of a switchable bi/tridirectional beam splitter for SPPs.
Unidirectional coupling achieved through engineered mode interference.
Polarization-dependent output channel selection confirmed.

Conclusions:

The proposed device offers a novel solution for light coupling and SPP routing.
Integration with dynamic polarization modulation can enable SPP routers and switches.
This work advances the development of compact plasmonic integrated circuits.