Approximate model for surface-plasmon generation at slit apertures

Lalanne, Philippe; Hugonin, Jean‐Paul; Rodier, Jean-Claude

doi:10.1364/josaa.23.001608

Cited by 115 publications

(142 citation statements)

References 27 publications

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“…The SPP intensity and amplitude are obtained by using the mode orthogonality condition. [32] To begin with, the symmetric slit (d = 0) is considered. The intensities of the right-and left-propagating SPPs generated by the symmetric slit of different slit widths are depicted in Figure 1 .…”

Section: Numerical Results and Analysismentioning

confidence: 99%

“…Based on Equation (4), the SPP intensity becomes a minimum when the slit width equals even multiple of the half wavelength while the SPP intensity reaches a maximum when the slit width equals odd multiple of the half wavelength, according well with the previous results. [31,32] The reason is that the charges at the corners of the symmetric slit exhibit opposite signs, as shown by the inset in Figure 1(b). This mechanism also explains the synchronous oscillation curves in the case of d = λ/2 [ Figure 1(e)].…”

Section: Numerical Results and Analysismentioning

confidence: 99%

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Controlling surface-plasmon-polaritons launching with hot spot cylindrical waves in a metallic slit structure

Yao¹,

Sun²,

Gong³

et al. 2016

Nanotechnology

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Plasmonic nanostructures, which are used to generate surface plasmon polaritions (SPPs), always involve sharp corners where the charges can accumulate. This can result in strong localized electromagnetic fields at the metallic corners, forming hot spots. The influence of the hot spots on the propagating SPPs are investigated theoretically and experimentally in a metallic slit structure. It is found that the electromagnetic fields radiated from the hot spots, termed as the hot spot cylindrical wave (HSCW), can greatly manipulate the SPP launching in the slit structure. The physical mechanism behind the manipulation of the SPP launching with the HSCW is explicated by a semi-analytic model. By using the HSCW, unidirectional SPP launching is experimentally realized in an ultra-small metallic step-slit structure. The HSCW bridges the localized surface plasmons and the propagating surface plasmons in an integrated platform and thus may pave a new route to the design of plasmonic devices and circuits.

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Section: Numerical Results and Analysismentioning

confidence: 99%

Section: Numerical Results and Analysismentioning

confidence: 99%

Controlling surface-plasmon-polaritons launching with hot spot cylindrical waves in a metallic slit structure

Yao¹,

Sun²,

Gong³

et al. 2016

Nanotechnology

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“…Although the TM mode propagates through the slit, it couples to surface plasmon modes on the front and back surfaces of the slit [14], which act as a loss channel. Since these losses are larger for certain slit widths [15][16][17], the transmitted intensity of the TM mode is more dependent on the slit width than the perfectly conducting waveguide model predicts.…”

Section: Introductionmentioning

confidence: 95%

“…(20) of Ref. [15], which gives an approximate analytical model. As an illustration of the important role these surface plasmon coupling constants play in the phenomenon described here, the TM transmission modelled with and without coupling to surface plasmons is shown in Fig.…”

Section: Waveguide Modelmentioning

confidence: 99%

A subwavelength slit as a quarter-wave retarder

Chimento¹,

Kuzmin²,

Bosman³

et al. 2011

Opt. Express

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Abstract:We have experimentally studied the polarization-dependent transmission properties of a nanoslit in a gold film as a function of its width. The slit exhibits strong birefringence and dichroism. We find, surprisingly, that the transmission of the polarization parallel to the slit only disappears when the slit is much narrower than half a wavelength, while the transmission of the perpendicular component is reduced by the excitation of surface plasmons. We exploit the slit's dichroism and birefringence to realize a quarter-wave retarder.

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“…For example, Kim et al designed an unidirectional SPP launcher consisting of a single slit with its width comparable to or larger than the incident wavelength [15] . However, such a wide slit has a low SPP excitation efficiency because most of the light illuminating the slit would be directly transmitted through the slit rather than coupling into SPPs [17] . Recently, we demonstrated efficient directional excitation of SPPs on a metal film through a subwavelength double nanoslit [16] .…”

mentioning

confidence: 99%

Tunable directional beaming assisted by asymmetrical SPP excitation in a subwavelength metallic double slit

Tan

Bai

et al. 2012

中国光学快报

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We present a design for tunable directional beaming through a subwavelength metallic double slit surrounded by dielectric surface-relief gratings. On-axis and off-axis beaming can be switched by controlling the incident angle to asymmetrically excite surface plasmon polaritons (SPPs) that are subsequently coupled out to propagating beams by the two gratings on the left and the right sides of the double slit. Furthermore, the division of optical power into two off-axis beaming directions can be tuned smoothly by varying the incident angle while keeping the total power almost unchanged. The mechanism of this effect is analyzed theoretically and verified using rigorous numerical simulations.OCIS Light emerging from a subwavelength slit or aperture is normally diffracted into all directions. Recently, the directional beaming effect from a subwavelength metallic slit due to the resonant interactions between surface plasmon polaritons (SPPs) and the surrounding grating structures has stimulated much interest due to its possibility to steer and confine emitted light beams in a small spatial range of angle [1,2] , which has potential applications in laser beam shaping [3−4] , optical interconnection [5] , secure communication, optical data storage, and optical imaging, among other areas. Considerable prior research related to optical on-axis and off-axis directional beaming has been conducted [6−13] , with the mechanism applied to mid-infrared [3,10] , THz wavebands [4] , acoustic wave [9] , and photonic crystals [12] . However, little work has been done on tunable directional beaming (i.e., modulating the beaming angle or power distribution by controlling signals), although tunable beaming with the use of permittivity-modulating material has been proposed before [8] . Hence, it is of great significance to realize tunably control of the directional beaming, which is highly desirable in various applications.Previously, various plasmonic devices have been used to exploit the angular-modulation of the incident light [14−16] . For example, Kim et al. designed an unidirectional SPP launcher consisting of a single slit with its width comparable to or larger than the incident wavelength [15] . However, such a wide slit has a low SPP excitation efficiency because most of the light illuminating the slit would be directly transmitted through the slit rather than coupling into SPPs [17] . Recently, we demonstrated efficient directional excitation of SPPs on a metal film through a subwavelength double nanoslit [16] . The SPPs can be directed into two opposite propagating directions with a predetermined splitting ratio by varying the incident angle. Such dynamic tunability of SPPs can be used to realize some useful applications. In this letter, a simple and effective design for tunable directional beaming through a metallic double slit surrounded by dielectric surface-relief gratings is proposed. On-axis and off-axis beaming can be switched by controlling the incident angle to asymmetrically excite SPPs that are subsequently coup...

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Approximate model for surface-plasmon generation at slit apertures

Cited by 115 publications

References 27 publications

Controlling surface-plasmon-polaritons launching with hot spot cylindrical waves in a metallic slit structure

Controlling surface-plasmon-polaritons launching with hot spot cylindrical waves in a metallic slit structure

A subwavelength slit as a quarter-wave retarder

Tunable directional beaming assisted by asymmetrical SPP excitation in a subwavelength metallic double slit

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