Efficient end-fire coupling of surface plasmons in a metal waveguide

Caitlin Fisher; Lindsay C. Botten; Christopher G. Poulton; Ross C. McPhedran; C. Martijn De Sterke

doi:10.1364/JOSAB.32.000412

Efficient end-fire coupling of surface plasmons in a metal waveguide

Caitlin Fisher^*, Lindsay C. Botten, Christopher G. Poulton, Ross C. McPhedran, C. Martijn De Sterke

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

We present a semi-analytical study exploring the end-fire coupling of an incident beam into a surface plasmon mode propagating on a metal-dielectric interface. An energy-conserving projection method is used to solve for the resultant reflected and transmitted fields for a given incident beam, thereby determining the efficiency of the surface plasmon coupling. The coupling efficiency is found to be periodic with waveguide width due to the presence of a coupled, transversely propagating surface plasmon. Optimization of the incident beam parameters, such as beam width, position, and wavelength, leads to numerically observed maximum efficiencies of approximately 80% when the beam width roughly matches the width of the surface plasmon.

Original language	English
Pages (from-to)	412-425
Number of pages	14
Journal	Journal of the Optical Society of America B: Optical Physics
Volume	32
Issue number	3
DOIs	https://doi.org/10.1364/JOSAB.32.000412
Publication status	Published - 1 Mar 2015

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title = "Efficient end-fire coupling of surface plasmons in a metal waveguide",

abstract = "We present a semi-analytical study exploring the end-fire coupling of an incident beam into a surface plasmon mode propagating on a metal-dielectric interface. An energy-conserving projection method is used to solve for the resultant reflected and transmitted fields for a given incident beam, thereby determining the efficiency of the surface plasmon coupling. The coupling efficiency is found to be periodic with waveguide width due to the presence of a coupled, transversely propagating surface plasmon. Optimization of the incident beam parameters, such as beam width, position, and wavelength, leads to numerically observed maximum efficiencies of approximately 80% when the beam width roughly matches the width of the surface plasmon.",

author = "Caitlin Fisher and Botten, {Lindsay C.} and Poulton, {Christopher G.} and McPhedran, {Ross C.} and {De Sterke}, {C. Martijn}",

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AU - Botten, Lindsay C.

AU - Poulton, Christopher G.

AU - McPhedran, Ross C.

AU - De Sterke, C. Martijn

PY - 2015/3/1

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AB - We present a semi-analytical study exploring the end-fire coupling of an incident beam into a surface plasmon mode propagating on a metal-dielectric interface. An energy-conserving projection method is used to solve for the resultant reflected and transmitted fields for a given incident beam, thereby determining the efficiency of the surface plasmon coupling. The coupling efficiency is found to be periodic with waveguide width due to the presence of a coupled, transversely propagating surface plasmon. Optimization of the incident beam parameters, such as beam width, position, and wavelength, leads to numerically observed maximum efficiencies of approximately 80% when the beam width roughly matches the width of the surface plasmon.

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JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

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Efficient end-fire coupling of surface plasmons in a metal waveguide

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