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

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Published on: July 21, 2018

Short-range surface plasmon propagation supported by stimulated amplification using electrical injection.

Yicen Li¹, Hui Zhang, Ning Zhu

¹Nanophotonics Laboratory, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.

|November 24, 2011

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We studied surface plasmon polaritons (SPPs) in a waveguide. Stimulated amplification in quantum wells (QWs) enhanced the short-range mode (SRSP) output power, enabling electrical modulation of SPPs.

Area of Science:

Optoelectronics
Materials Science
Nanophotonics

Background:

Surface plasmon polaritons (SPPs) are electromagnetic waves coupled to electron oscillations on metal surfaces.
Investigating SPP propagation in waveguides is crucial for developing advanced optical devices.
Quantum wells (QWs) offer a gain medium for amplifying SPPs.

Purpose of the Study:

To investigate the propagation characteristics of long-range (LRSP) and short-range (SRSP) SPPs.
To analyze the influence of gain spectral nonuniformity on SPP modes.
To demonstrate the potential for electrical modulation of SPPs via stimulated amplification.

Main Methods:

Fabrication of a waveguide using gold (Au) film and quantum wells (QWs) gain medium.
Experimental investigation of LRSP and SRSP propagation.

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Analysis of output spectra and power measurements over an 80 μm travel distance.

Main Results:

SRSP exhibited a narrower output spectrum compared to LRSP due to gain spectral nonuniformity.
Stimulated amplification (SA) in electrically-pumped QWs supported SRSP propagation.
SRSP output power was 1.6 times greater than LRSP output power.

Conclusions:

SRSP propagation is effectively supported by stimulated amplification in QWs.
The mechanism provides a pathway for electrical modulation of SPPs.
This research advances the development of electrically controlled plasmonic devices.