Optimization of surface plasmons launching from subwavelength hole arrays: modelling and experiments

Laluet, Jean-Yves; Devaux, Éloïse; Genet, Cyriaque; Ebbesen, Thomas W.; Weeber, Jean Claude; Dereux, Alain

doi:10.1364/oe.15.003488

Cited by 56 publications

(41 citation statements)

References 12 publications

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“…is the Huygens-Fresnel plasmonic propagator [28,29] andn n = κ −1 (d 2 ρ n /ds 2 ) the local unit normal vector determined from the curvature κ and the arc length s of the groove.…”

Section: Pacs Numbersmentioning

confidence: 99%

Generating Far-Field Orbital Angular Momenta from Near-Field Optical Chirality

et al. 2013

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We demonstrate that nanostructures carefully designed on both sides of a thin suspended metallic membrane couple light into a chiral near field and transmit vortex beams through a central aperture that connects the two sides of the membrane. We show how far-field orbital angular momentum (OAM) indices can be tailored through nanostructure designs. We reveal the crucial importance of OAM selection rules imposed by the central aperture and derive OAM summation rules in perfect agreement with experimental data. PACS numbers:Structured light beams with phase or polarization singularities, have revealed unique optical properties with applications ranging from super-resolution imaging [1] to high-resolution sensing [2] and from particle micromanipulation [3] to quantum optics [4]. Currently, chiral nanostructures draw promising routes for enhancing singular optical signatures, thus providing extended control over new functionalities in metamaterial science [5] and biomimetics engineering [6,7]. Interestingly, while the connection between optics and chirality is well established for 3 dimensional (3D) chiral structures, the interaction of chiral light with 2D chiral objects is a topic of on-going debate [8][9][10], with strong potential in physical chemistry for chirality enhancement in the near field [11][12][13].Recently, singular optical effects have been discussed in the near field, in particular in relation to chiral surface plasmon (SP) modes which have been shown to carry orbital angular momentum (OAM) [14][15][16][17]. But until now, singular SP modes and associated spin-orbit coupling have only been probed in the near field [18][19][20]. Studies on plasmonic beaming with OAM have been scarce [21,22] and the relation between near-field chirality and OAM in the far field was never addressed.In this Letter, we demonstrate that nanostructures carefully designed on both sides of a thin suspended membrane lead to tailoring optical OAM in the far field. Single and double-sided plasmonic structures consisting of concentric grooves periodically spaced from a central subwavelength aperture -so called plasmonic bull's eye (BE)-have shown extraordinary optical transmission and beaming effects [23,24]. Yet, the OAM behaviour of these structures was not discussed. This Letter presents a comprehensive analysis of the OAM transfer during plasmonic in-coupling and out-coupling by chiral nanostructures at each side of a membrane, stressing in particular the role of a back-side structure in generating vortex beams as e iℓϕ with tunable OAM indices ℓ. With such membranes, we achieve propagating beams carrying OAM up to |ℓ| = 8. Moreover we reveal and analyze the fundamental role of the central aperture in the system's OAM generation through specific selection rules.Our device consists of a suspended thin (h ∼ 300 nm) metallic membrane, fabricated by evaporating a metal film over a poly(vinyl formal) resine supported by a transmission electron microscopy copper grid. After evaporation, the resine is removed using a focused ion-bea...

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“…is the Huygens-Fresnel plasmonic propagator [28,29] andn n = κ −1 (d 2 ρ n /ds 2 ) the local unit normal vector determined from the curvature κ and the arc length s of the groove.…”

Section: Pacs Numbersmentioning

confidence: 99%

Generating Far-Field Orbital Angular Momenta from Near-Field Optical Chirality

et al. 2013

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“…On the contrary, a low NA objective illuminates an extended portion of the slit. The interferences between SPPs excited all along the illuminated portion of the slit result in the decrease of the divergence of the SPP emission [13]. To study the influence of the slit width on the intensity of the SPP resonance, we recorded the intensity in the Fourier plane with the same illumination conditions for all widths and performed radial cross-cuts along the direction perpendicular to the slit as shown in figure 4.…”

Section: Observationsmentioning

confidence: 99%

“…The SPP beam emerging from a single hole is thus highly diverging [9]. Holes have to be arranged in arrays if one wants to obtain a well collimated or even a converging SPP beam [10]- [13]. An alternative solution to hole arrays is the single slit source.…”

Section: Introductionmentioning

confidence: 99%

Generation of surface plasmons at single subwavelength slits: from slit to ridge plasmon

et al. 2008

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“…28 Some did not like the larger shifts of resonance positions from zero-order, smooth metal predictions, however, these are now understood as due to coupling of SPs between the front and back surfaces of the mesh through the holes. [10][11][12]29 One can also observe transmission resonances due to modes other than SPs for "bad" SP metals ͓such as Cr, 30 27,36 and cathode luminescence. 37 These and related techniques run into challenges as they approach the IR region.…”

Section: Introductionmentioning

confidence: 99%

Propagation lengths of surface plasmon polaritons on metal films with arrays of subwavelength holes by infrared imaging spectroscopy

Cilwa

Rodriguez

Heer

et al. 2009

The Journal of Chemical Physics

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Metal films with arrays of subwavelength holes (mesh) exhibit extraordinary transmission resonances to which many attribute a role for surface plasmon polaritons (SPPs); others debated this point. Experimental measurements of propagation lengths are presented under conditions that pertain to the use of SPPs for surface spectroscopy. The lateral extent of electromagnetic propagation along the mesh surface is measured by recording absorption spectra of a line of latex microspheres as a function of distance away from the line along the mesh. Measurements reveal an exponential functional form for decay of absorption signal laterally from the absorption source. Results at 697 cm−1, which are closest to the strongest transmission resonance of the mesh, reveal a 1/e propagation distance along the surface of 17.8±2.9 μm. This is 40% larger than the lattice spacing implicating the holes as the SPP damping mechanism, however, this is significantly shorter than smooth metal expectations.

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Optimization of surface plasmons launching from subwavelength hole arrays: modelling and experiments

Cited by 56 publications

References 12 publications

Generating Far-Field Orbital Angular Momenta from Near-Field Optical Chirality

Generating Far-Field Orbital Angular Momenta from Near-Field Optical Chirality

Generation of surface plasmons at single subwavelength slits: from slit to ridge plasmon

Propagation lengths of surface plasmon polaritons on metal films with arrays of subwavelength holes by infrared imaging spectroscopy

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