Cross Conversion between Surface Plasmon Polaritons and Quasicylindrical Waves

Xy, Yang; Ht, Liu; Lalanne, Philippe

doi:10.1103/physrevlett.102.153903

Cited by 64 publications

(57 citation statements)

References 16 publications

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“…By drawing lines perpendicular to the Poynting streamlines on Fig. 2 (c), and taking in account that the predominant term in S ei is E e × H i , one can deduce that the evanescent wave shape is quasi-cylindrical [21,22]. The evanescent flux S e (not shown) carries energy 1000 times weaker and does not play an active role in the funneling for this structure at normal incidence.…”

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confidence: 99%

Light Funneling Mechanism Explained by Magnetoelectric Interference

et al. 2011

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We investigate the mechanisms involved in the funneling of the optical energy into sub-wavelength grooves etched on a metallic surface. The key phenomenon is unveiled thanks to the decomposition of the electromagnetic field into its propagative and evanescent parts. We unambiguously show that the funneling is not due to plasmonic waves flowing toward the grooves, but rather to the magnetoelectric interference of the incident wave with the evanescent field, this field being mainly due to the resonant wave escaping from the groove.Plasmonics, as the science of the efficient coupling of photons with free electron gas oscillation modes at the surface of metals, appears as an inescapable solution for the design and realization of optical nano antennas [1]. Numerous cutting edge applications are based on nanoantennas like biosensing [2], gas sensing [3], photovoltaic [4] or infrared photodetection [5] which exploit the intense local electromagnetic field in a confined volume [6][7][8]. Now, the specific matter of total photon harvesting at the nanometric scale, i.e. designing an antenna able to couple all the incident optical power with a nanoabsorber, remains challenging [1,[7][8][9]. The natural twostep antenna sequence (collection of light, then concentration) has been extensively studied in structures made of a metallic subwavelength grating surrounding a target [6,[10][11][12][13][14]. The underlying mechanism involves SPP excitation (collection) and propagation (concentration) along the grating until the coupling with the target. Such structures, though, are designed to collect light at a specific incidence angle, which is obviously a strong practical limitation.In contrast, quasi-isotropic perfect transmission is obtained through very narrow slits drilled in a metallic membrane [15,16]. This perfect transmission is successfully explained by a localized Fabry-Perot resonance in the slits [17]. However the funneling, namely the mechanism responsible for the redirection and subsequent concentration of the whole incident energy flow, from the surface toward the tiny aperture of the slits, remains unclear. Yet, a pictorial model of the underlying physics is of a key importance for the design of efficient nanoantennas.Such a model is given by the energetic point of view [19]: Poynting vector streamlines distinctly show that the incident flow bends when reaching the metal surface, and then propagates along the interface toward the slits. This fits with the intuitive explanation, inspired by the SPP excitation process, that plasmonic waves drive the funneling sequence [20]. Furthermore, quasicylindric waves were recently identified as the dominant short-range propagation process of the field amplitude along the surface of the grating [21,22]. Nevertheless, even if the evanescent waves are naturally assumed to concentrate the energy toward the apertures of the slits, no specific study of the light funneling has so far been carried out to our knowledge.In this letter, we definitely unveil the funneling process, and highl...

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Light Funneling Mechanism Explained by Magnetoelectric Interference

et al. 2011

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“…Toward the nearinfrared, the SPP amplitudes oscillate more noticeably for small separations, departing from the pure SPP coupled-wave model. This is characteristic of contributions from the cross-conversion [19] of CWs that are more strongly excited at longer wavelengths. Similar trends are found for β 0 (not shown), which is nearly identical to α.…”

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confidence: 99%

Broadband and efficient plasmonic control in the near-infrared and visible via strong interference of surface plasmon polaritons

Gan

Nash

2013

Opt. Lett.

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Broadband and tunable control of surface plasmon polaritons in the near-infrared and visible spectrum is demonstrated theoretically and numerically with a pair of phased nanoslits. We establish, with simulations supported by a coupled wave model, that by dividing the incident power equally between two input channels, the maximum plasmon intensity deliverable to either side of the nanoslit pair is twice that for an isolated slit. For a broadband source, a compact device with nanoslit separation of the order of a tenth of the wavelength is shown to steer nearly all the generated plasmons to one side for the same phase delay, thereby achieving a broadband unidirectional plasmon launcher. The reported effect can be applied to the design of ultra-broadband and efficient tunable plasmonic devices.

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“…Here, the electromagnetic wave radiated from the hot spots is termed as the hot spot cylindrical wave (HSCW). Different from the quasi-CW, which is a surface wave of a p-polarized state, [34][35][36] HSCW is a radiated wave in the free space and is independent of the polarizations. [29] As shown in Figure 2(c), the right-and left-propagating SPP amplitudes (denoted by H R and H L , respectively) are composed of two parts: the pure-SPP parts (HSP R and HSP L ) and the hot-spot parts (HHS R and HHS L ).…”

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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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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Cross Conversion between Surface Plasmon Polaritons and Quasicylindrical Waves

Cited by 64 publications

References 16 publications

Light Funneling Mechanism Explained by Magnetoelectric Interference

Light Funneling Mechanism Explained by Magnetoelectric Interference

Broadband and efficient plasmonic control in the near-infrared and visible via strong interference of surface plasmon polaritons

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

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