Subwavelength chiral surface plasmons that carry tuneable orbital angular momentum

Rüting, Felix; Fernández‐Domínguez, Antonio I.; Martín‐Moreno, Luis; García‐Vidal, F. J.

doi:10.1103/physrevb.86.075437

Cited by 35 publications

(25 citation statements)

References 36 publications

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“…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].…”

Section: Pacs Numbersmentioning

confidence: 99%

“…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].…”

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confidence: 99%

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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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Section: Pacs Numbersmentioning

confidence: 99%

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confidence: 99%

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

et al. 2013

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“…Typically, silicon wires with diameters in nano-scale have been introduced to support propagation of light with little loss [18], but much of the electromagnetic energy is actually propagated outside the wire, leading to serious problem of coupling between adjacent wires. Up to now, high efficiency optical applications for OAM propagating in nano-scale are still missing although some chiral surface plasma has been observed [20,21].…”

Section: Introductionmentioning

confidence: 99%

Transfer of orbital angular momentum through sub-wavelength waveguides

Wang¹,

Ma²,

Pu³

et al. 2015

Opt. Express

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Data capacity of optical communication is achieving its limit owing to the non-linear effect of optical fiber. As an effective alternative, light carrying orbital angular momentum can greatly increase the capacity for its unprecedented degree of freedom. We demonstrate the propagation of orbital angular momentum with topological charge of 1 and 2 in plasmonic circular waveguide with sub-wavelength diameter with little propagation loss of 2.73 dB/μm, which has never been observed in optical fibers with sub-wavelength diameter. We also confirm that lights carrying orbital angular momentum can be maintained in sharp bended sub-wavelength waveguide. This plasmonic waveguide may serve as a key component in on-chip systems involving OAM.

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“…This offers the possibility to control both the chirality and the orbital angular momentum of electromagnetic fields at the subwavelength scale. Different plasmon chiral nanostructures draw promising routes for enhancing the optical near field, thus providing extended control over new functionalities in metamaterial science, biomimetics engineering and biosensing [6][7][8][9]. New results show unique possibilities for generating far-field optical vortex beams from near-field optical chirality [10].…”

Section: Introductionmentioning

confidence: 99%

“…The phase singularities represent centers of local circulating optical power flows, or simply optical vortices [5]. On the other hand, it has been demonstrated that a helically grooved metal wire supports the propagation of chiral surface plasmon polaritons [6]. This offers the possibility to control both the chirality and the orbital angular momentum of electromagnetic fields at the subwavelength scale.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Kamenetskii

Joffe²,

Berezin³

et al. 2013

PIER B

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Abstract-There has been a surge of interest in the subwavelength confinement effects of the electromagnetic fields. Based on these effects, one can obtain new behaviors of the near-and far-field radiation.It is well known that in optics, the subwavelength confinement can be obtained due to surface-plasmon (or electrostatic) oscillations in metal structures. This paper is a review of recent studies on the subwavelength confinement in microwaves due to magnetic-dipolar-mode (MDM) [or magnetostatic (MS)] oscillations in small ferrite samples. MDM oscillations in a mesoscopic ferritedisk particle are quantized oscillations, which are characterized by energy eigenstates. The field structures are distinguished by powerflow vortices and non-zero helicity. Also in vacuum, the near fields originated from MDM particles are designated by topologically distinctive power-flow vortices, non-zero helicity, and a torsion degree of freedom.To differentiate such field structures from regular electromagnetic (EM) field structures, we term them as magnetoelectric (ME) fields. In a pattern of the microwave field scattered by a MDM ferrite disk and MDM-disk arrays, one can observe rotating topological-phase dislocations. This opens a perspective for creation of engineered electromagnetic fields with unique symmetry properties. In the near-field applications, we propose novel microwave sensors for material characterization, biology, and nanotechnology. Strong energy concentration and unique topological structures of the near fields originated from the MDM resonators allow effective measuring chiral properties of materials in microwaves. Generating

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Subwavelength chiral surface plasmons that carry tuneable orbital angular momentum

Cited by 35 publications

References 36 publications

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

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

Transfer of orbital angular momentum through sub-wavelength waveguides

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

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