Dual-polarization plasmonic metasurface for nonlinear optics

Lesina, Antonino Calà; Ramunno, Lora; Berini, Pierre

doi:10.1364/ol.40.002874

“…3(b,d) we give the surface charge density showing a strong dipole oscillation in the gap for LCP excitation. In [45] we considered a similar unit cell to build a metasurface for difference frequency generation, which for simplicity was assumed square (L x = L z ). The mirror symmetry with respect to the θ = 135…”

Section: Butterfly Nanoantennamentioning

confidence: 99%

Vectorial control of nonlinear emission via chiral butterfly nanoantennas: generation of pure high order nonlinear vortex beams

Lesina

¹

,

Berini

²

,

Ramunno

³

2017

Self Cite

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We report on a chiral nanostructure, which we term a "butterfly nanoantenna," that, when used in a metasurface, allows the direct conversion of a linearly polarized beam into a nonlinear optical far-field of arbitrary complexity. The butterfly nanoantenna exhibits field enhancement in its gap for every incident linear polarization, which can be exploited to drive nonlinear optical emitters within the gap, for the structuring of light within a frequency range not accessible by linear plasmonics. As the polarization, phase and amplitude of the field in the gap are highly controlled, nonlinear emitters within the gap behave as an idealized Huygens source. A general framework is thereby proposed wherein the butterfly nanoantennas can be arranged on a surface to produce a highly structured far-field nonlinear optical beam with high purity. A third harmonic Laguerre-Gauss beam carrying an optical orbital angular momentum of 41 is demonstrated as an example, through large-scale simulations on a high-performance computing platform of the full plasmonic metasurface with an area large enough to contain up to 3600 nanoantennas.

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“…3(b,d) we give the surface charge density showing a strong dipole oscillation in the gap for LCP excitation. In [45] we considered a similar unit cell to build a metasurface for difference frequency generation, which for simplicity was assumed square (L x = L z ). The mirror symmetry with respect to the θ = 135 • axis in that case prevented the production of a field enhancement in the gap for 135 • incident linear polarization.…”

Section: Butterfly Nanoantennamentioning

confidence: 99%

Chiral Huygens metasurfaces for nonlinear structuring of linearly polarized light

Lesina,

Berini,

Ramunno

2016

Preprint

0

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We report on a chiral nanostructure, which we term a "butterfly nanoantenna," that, when used in a metasurface, allows the direct conversion of a linearly polarized beam into a nonlinear optical far-field of arbitrary complexity. The butterfly nanoantenna exhibits field enhancement in its gap for every incident linear polarization, which can be exploited to drive nonlinear optical emitters within the gap, for the structuring of light within a frequency range not accessible by linear plasmonics. As the polarization, phase and amplitude of the field in the gap are highly controlled, nonlinear emitters within the gap behave as an idealized Huygens source. A general framework is thereby proposed wherein the butterfly nanoantennas can be arranged on a surface to produce a highly structured far-field nonlinear optical beam with high purity. A third harmonic Laguerre-Gauss beam carrying an optical orbital angular momentum of 41 is demonstrated as an example, through large-scale simulations on a high-performance computing platform of the full plasmonic metasurface with an area large enough to contain up to 3600 nanoantennas.

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“…Many functional designs have been developed based on metasurfaces for different applications in terms of electromagnetic wave control, which include beam steering [5][6][7] as well as the transformation of propagating waves into surface waves [8], multi-functional metasurfaces [9], polarization control [10], hologram [11], at microwave and optical frequencies. Different metasurface designs have also been introduced for dual polarization applications [12][13][14], as well as for broad band frequency designs [15][16][17]. In the context of wave manipulation and control based on metasurface designs, retrodirective metasurfaces [12] have been shown to be an interesting feature for different applications such as radar cross section (RCS) enhancement [18,19], specially for radar targets where backscattered power reflection level is poor.…”

Section: Introductionmentioning

confidence: 99%

Retrodirective metasurfaces from non-reciprocal to reciprocal using impedance modulation for high-super-cell-periodicity designs

Kalaagi

¹

,

Seetharamdoo

²

2020

Appl. Phys. A

9

0

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The growing popularity of metasurfaces and their exceptional physical phenomenons, have gained remarkable interest in terms of propagation and electromagnetic wave control. Particularly, for the case of retro-reflection, retrodirective gradient metasurfaces are well known for their reciprocal responses in terms of retro-reflection specially for subwavelength super-cell periodicity designs. Recently, we have observed that for metasurfaces with high super-cell periodicities greater than 2λ, the retrodirective metasurface loses its reciprocal response in terms of retrodirectivity. The main challenge in this case, is to retain the reciprocal response, as well as achieving efficient responses for retroreflection at the higher orders of diffraction that exist at these periodicities. Thus, in this paper we demonstrate the design of a retrodirective metasurface from non reciprocal to reciprocal following the generalized phase law of reflection and introducing the impedance modulation technique, for a metasurface operating at 14.7 GHz with a super-cell periodicity of 2.88 λ. On the other hand, with a well engineered surface impedance of a super-cell at these periodicities, efficient responses of retro-reflection can be achieved at the higher orders of diffraction, giving rise to a retrodirective metasurface design operating simultaneously for multiple incident angles. Retro-reflection has been achieved at eleven angles simultaneously and the reciprocal property was retained at the desired angle of incidence 10 • .

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Dual-polarization plasmonic metasurface for nonlinear optics

Cited by 25 publications

References 31 publications

Vectorial control of nonlinear emission via chiral butterfly nanoantennas: generation of pure high order nonlinear vortex beams

Vectorial control of nonlinear emission via chiral butterfly nanoantennas: generation of pure high order nonlinear vortex beams

Chiral Huygens metasurfaces for nonlinear structuring of linearly polarized light

Retrodirective metasurfaces from non-reciprocal to reciprocal using impedance modulation for high-super-cell-periodicity designs

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