Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films

F. Kalkum; G. Gay; O. Alloschery; J. Weiner; H. J. Lezec; Y. Xie; M. Mansuripur

doi:10.1364/OE.15.002613

Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films

F. Kalkum, G. Gay, O. Alloschery, J. Weiner, H. J. Lezec, Y. Xie, M. Mansuripur

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

21 Scopus citations

Abstract

We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction n_surf measured for the surface wave propagating over a distance of more than 12 μm is determined to be n_surf = 1.016 ±0.004, to within experimental uncertainty close to the expected bound surface plasmon-polariton (SPP) value for a Au/Air interface of n_Spp = 1.018. We compare these measurements to finite-difference-time-domain (FDTD) numerical simulations of the optical field transmission through these devices. We find excellent agreement between the measurements and the simulations for n_surf. The measurements also show that the surface wave propagation parameter k_surf exhibits transient behavior close to the slit, evolving smoothly from greater values asymptotically toward k_spp over the first 2-3 μm of slit-groove distance x_sg. This behavior is confirmed by the FDTD simulations.

Original language	English (US)
Pages (from-to)	2613-2621
Number of pages	9
Journal	Optics Express
Volume	15
Issue number	5
DOIs	https://doi.org/10.1364/OE.15.002613
State	Published - Mar 5 2007

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films",

abstract = "We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction nsurf measured for the surface wave propagating over a distance of more than 12 μm is determined to be nsurf = 1.016 ±0.004, to within experimental uncertainty close to the expected bound surface plasmon-polariton (SPP) value for a Au/Air interface of nSpp = 1.018. We compare these measurements to finite-difference-time-domain (FDTD) numerical simulations of the optical field transmission through these devices. We find excellent agreement between the measurements and the simulations for nsurf. The measurements also show that the surface wave propagation parameter ksurf exhibits transient behavior close to the slit, evolving smoothly from greater values asymptotically toward kspp over the first 2-3 μm of slit-groove distance xsg. This behavior is confirmed by the FDTD simulations.",

author = "F. Kalkum and G. Gay and O. Alloschery and J. Weiner and Lezec, {H. J.} and Y. Xie and M. Mansuripur",

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T1 - Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films

AU - Kalkum, F.

AU - Gay, G.

AU - Alloschery, O.

AU - Weiner, J.

AU - Lezec, H. J.

AU - Xie, Y.

AU - Mansuripur, M.

PY - 2007/3/5

Y1 - 2007/3/5

N2 - We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction nsurf measured for the surface wave propagating over a distance of more than 12 μm is determined to be nsurf = 1.016 ±0.004, to within experimental uncertainty close to the expected bound surface plasmon-polariton (SPP) value for a Au/Air interface of nSpp = 1.018. We compare these measurements to finite-difference-time-domain (FDTD) numerical simulations of the optical field transmission through these devices. We find excellent agreement between the measurements and the simulations for nsurf. The measurements also show that the surface wave propagation parameter ksurf exhibits transient behavior close to the slit, evolving smoothly from greater values asymptotically toward kspp over the first 2-3 μm of slit-groove distance xsg. This behavior is confirmed by the FDTD simulations.

AB - We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction nsurf measured for the surface wave propagating over a distance of more than 12 μm is determined to be nsurf = 1.016 ±0.004, to within experimental uncertainty close to the expected bound surface plasmon-polariton (SPP) value for a Au/Air interface of nSpp = 1.018. We compare these measurements to finite-difference-time-domain (FDTD) numerical simulations of the optical field transmission through these devices. We find excellent agreement between the measurements and the simulations for nsurf. The measurements also show that the surface wave propagation parameter ksurf exhibits transient behavior close to the slit, evolving smoothly from greater values asymptotically toward kspp over the first 2-3 μm of slit-groove distance xsg. This behavior is confirmed by the FDTD simulations.

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Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films

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