Design, near-field characterization, and modeling of 45° surface-plasmon Bragg mirrors

González, Marı́a Ujué; Weeber, Jean Claude; Baudrion, Anne-Laure; Dereux, Alain; Степанов, А. Л.; Krenn, Joachim R.; Devaux, Éloïse; Ebbesen, Thomas W.

doi:10.1103/physrevb.73.155416

Cited by 99 publications

(68 citation statements)

References 36 publications

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“…The design of this device is based on two facts. The first one is that the reflection of SPPs by a periodic array of indentations presents maxima at the low-l edges of the plasmonic bandgaps [14][15][16] . For subwavelength indentations, the spectral locations of these edges can be obtained by folding the dispersion relation of SPPs for a flat metal surface into the first Brillouin zone, satisfying the following expression:…”

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confidence: 99%

Efficient unidirectional nanoslit couplers for surface plasmons

et al. 2007

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The emerging field of plasmonics is based on exploiting the coupling between light and collective electronic excitations within conducting materials known as surface plasmons. Because the so-called surface plasmon polariton (SPP) modes that arise from this coupling are not constrained by the optical diffraction limit, it is hoped that they could enable the construction of ultracompact optical components 1,2 . But in order that such potential can be realized, it is vital that the relatively poor light-SPP coupling be improved. This is made worse by the fact that the incident light that is conventionally used to launch SPPs in a metal film 3-6 is a significant source of noise, unless directed away from a region of interest, which then decreases the signal and increases the system's size. Back-side illumination of subwavelength apertures in optically thick metal films 7-13 eliminates this problem but does not ensure a unique propagation direction for the SPP. We propose a novel back-side slit-illumination method that incorporates a periodic array of grooves carved into the front side of a thick metal film. Bragg reflection enhances the propagation of SPPs away from the array, enabling them to be unidirectionally launched from, and focused to, a localized point.A picture of the proposed surface plasmon polariton (SPP) launcher is shown in Fig. 1. A periodic array of one-dimensional indentations is fabricated at the (output) metal surface close and parallel to the illuminated slit. The design of this device is based on two facts. The first one is that the reflection of SPPs by a periodic array of indentations presents maxima at the low-l edges of the plasmonic bandgaps [14][15][16] . For subwavelength indentations, the spectral locations of these edges can be obtained by folding the dispersion relation of SPPs for a flat metal surface into the first Brillouin zone, satisfying the following expression:where P is the period of the array, k p holds for the in-plane plasmon wavevector and m is the band index. Remarkably, although the reflectance maxima depend on the groove geometry (width and depth) and the number of grooves, their spectral locations do not. The second fact is that the phase picked up by the SPP on reflection is just mπ, precisely at the condition given by

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confidence: 99%

Efficient unidirectional nanoslit couplers for surface plasmons

et al. 2007

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“…Today's tremendous interest for the utilization of surface plasmon-polaritons (SPPs) to transmit and process optical information on metallic structures has given rise to a broad variety of guiding structures [1][2][3][4][5][6][7], as well as passive and active components [8][9][10][11][12][13][14][15]. For all these structures, a key issue is how a SPP can tunnel between two guiding elements.…”

Section: Introductionmentioning

confidence: 99%

Resonant tunneling of surface plasmon-polaritons

Sidorenko¹,

Martin²

2007

Opt. Express

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Abstract:The tunneling of surface plasmon-polaritons (SPPs) across an interruption in the metallic film supporting them is numerically investigated in details. Both non-symmetrical and symmetrical geometries are considered. A very high tunneling efficiency is calculated for the long-range surface plasmon in the symmetrical geometry, with an amplitude transmission as high as 80% over a 5 μm gap for a 40 nm thick gold film illuminated at λ=785nm. The transmission is somewhat lower in the nonsymmetrical geometry. The coupling between the different SPP modes (radiative and non-radiative) in that geometry is also investigated in detail. This coupling depends periodically upon the length of the gap. Overall, the results indicate that SPPs are not very sensitive to technological imperfections and can survive large waveguide interruptions.

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“…1,2 As a result of such a study, phenomena like total suppression of reflection, 3 transformation of polarization, [4][5][6] enhanced light transmission, 7,8 formation of band gaps [9][10][11][12] and other interesting properties of plasmonic crystals have been discovered. Lately, a great deal of attention has been devoted to the creation of optical elements for SPP's, [13][14][15][16][17] as well as to the efficient coupling of light into and out of SPP's. These latter problems require a precise knowledge of the scattering coefficients of the dispersion centers ͑i.e., deviations from a flat metal-dielectric interface͒ placed on the path of SPP's.…”

Section: Introductionmentioning

confidence: 99%

Scattering of surface plasmon polaritons by one-dimensional inhomogeneities

2007

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The scattering of surface plasmons polaritons by a one-dimensional defect of the surface is theoretically studied by means of both Rayleigh and modal expansions. The defects considered are either relief perturbations or variations in the permittivity of the metal. The dependence of transmission, reflection, and out-of-plane scattering on parameters defining the defect is presented. We find that the radiated energy is forwardly directed ͑with respect to the surface plasmon propagation͒ in the case of an impedance defect. However, for relief defects, the radiated energy may be directed into the backward or forward ͑or both͒ direction, depending on the defect width.

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Design, near-field characterization, and modeling of 45° surface-plasmon Bragg mirrors

Cited by 99 publications

References 36 publications

Efficient unidirectional nanoslit couplers for surface plasmons

Efficient unidirectional nanoslit couplers for surface plasmons

Resonant tunneling of surface plasmon-polaritons

Scattering of surface plasmon polaritons by one-dimensional inhomogeneities

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