Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

Genevet, Patrice; Wintz, Daniel; Ambrosio, Antonio; She, Alan; Blanchard, Romain; Capasso, Federico

doi:10.1038/nnano.2015.137

Cited by 133 publications

(103 citation statements)

References 32 publications

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“…Figure 10f shows the generation of SPP wakes through aper ture antennas, which can introduce a phase shift with the same phase gradient. [141] The aperture antennas were separated in a distance shorter than λ SSP to bring phase shifts, thus can con trol the illumination angle of SPP wakes. This condition was written as k 0 sin θΔx + Δϕ = k spp sinγΔx, and sin γ = sinθ/n eff + dϕ/ k spp dx.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

170

122

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(circular birefringence) and absorption losses (circular dichroism) with the circu larly polarized light (CPL) illumination. [10] CB arises from the difference in the real part of refractive index, leading to a dif ferent velocity for LCP and RCP compo nents, and thus results in the polarization rotation of the linearly polarized incident light. CD corresponds to the difference in the imaginary part of refractive index, resulting in a distinct absorption loss for LCP and RCP excitations. Besides the con ventional CD and CB, asymmetric trans mission (circular conversion dichroism) is another fundamental chiroptical pheno menon, which exists in the nondiffracting array, referring to different LCPtoRCP and RCPtoLCP conversion efficiencies. [11] All of these chiroptical phenomena have been successfully applied in the spectros copy for identifying special arrangements of chiral matters in biology, chemistry and physics as efficient diagnostic tools. [12][13][14][15][16] However, the chirop tical response in natural chiral materials is relatively weak due to the small electromagnetic (EM) interaction volume, [17] hence limits its further applications.Recent progress in plasmonics paves the way for the enhancement of chiroptical response. [18][19][20] Surface plasmons (SPs), as the collective electrons oscillation at the dielectric and metal interface, [21][22][23] present the capacity of light confine ment and field enhancement, which significantly improve the strength of lightmatter interactions. [24][25][26][27][28] With the uptodate nanofabrication technology, the study field of chirality has been extended from traditional chiral molecules to 3D metallic nanostructures. [29][30][31][32] Chiroptical responses of metallic meta molecules have been widely investigated, [33][34][35] and applied in various fields, such as biosensing, [36] chiral catalysis, [37] polari zation tuning, [38] and chiral photo detection.[39] The 3D metallic structure exhibited giant optical activity response because of the strong interaction between electric and magnetic resonant modes. [40,41] Different from 3D chiral ensembles, planar chiral structures show none chiral effect, as they can always coincide with their mirror images. However, 2D chirality was successfully found in the quasitwodimensional (quasi2D) chiral structure. [42] Moreover, recent reports show that even achiral nanomaterials have the ability to generate strong CD under an oblique CPL illumination. [43] This kind of extrinsic chirality arises from sym metry breaking of the incident light and the quasi2D material, which is quite different from the intrinsic chirality of 3D chiral The plasmonic chiroptical effect has been used to manipulate chiral states of light, where the strong field enhancement and light localization in metallic nanostructures can amplify the chiroptical response. Moreover, in metamaterials, the chiroptical effect leads to circular dichroism (CD), circular birefringence (CB), and asymmetric transmission. Potential applications enabled by chiral plasmonics...

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Section: Wwwadvopticalmatdementioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

170

122

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“…On the one hand, the quantumČerenkov effect can be described as the Smith-Purcell zero-order effect in a medium; on the other hand, this analogy allows us to derive the Smith-Purcell effect from the quantumČerenkov equation by inserting the grating as an effective refractive index. In this manner, many interesting traits explored in the field ofČerenkov radiation may apply to Smith-Purcell radiation, with examples such as the reverseď Cerenkov cone in materials of negative refraction and the plasmonicČerenkov effect in metasurfaces and 2D materials [34,[43][44][45]. These suggest analogous Smith-Purcell effects that would occur when such modern nanophotonic structures are fabricated with periodic structures in or near them.…”

Section: Controling the Quantum Correctionsmentioning

confidence: 99%

Light generation via quantum interaction of electrons with periodic nanostructures

2017

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The Smith-Purcell effect is a hallmark of light-matter interactions in periodic structures, resulting in light emission with distinct spectral and angular distribution. We find yet undiscovered effects in Smith-Purcell radiation that arise due to the quantum nature of light and matter, through an approach based on exact energy and momentum conservation. The effects include emission cutoff, convergence of emission orders, and a possible second photoemission process, appearing predominantly in structures with nanoscale periodicities (a few tens of nanometers or less), accessible by recent nanofabrication advances. We further present ways to manipulate the effects by varying the geometry or by accounting for a refractive index. Our derivation emphasizes the fundamental relation between Smith-Purcell radiation andČerenkov radiation, and paves the way to alternative kinds of light sources wherein nonrelativistic electrons create Smith-Purcell radiation in nanoscale, on-chip devices. Finally, the path towards experimental realizations of these effects is discussed.

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“…The orientations of the slits are chosen to have cosα invariant for the two horizontal directions so that the interference is between waves of the same magnitude. Such a slit (with dipolar radiation profile) array is very useful in tailoring the propagation of surface plasmon polaritons, for example, generating Cherenkov surface plasmon [106] and achieving spin-dependent transmission through decorated subwavelength aperture on plasmonic metal [107]. The appearance of the spin-flipping geometric-phase term involving 2σα in Eq.…”

Section: Surface Plasmon Generation With Geometric-phase Metasurfacesmentioning

confidence: 99%

“…A very useful and alternative perspective is a spin-splitting of the dispersion diagram of the material itself. By exploiting geometric-phase metasurfaces with rotated microstructures [103,104,106,107], an optical counterpart of the Rashba effect can be observed [109][110][111][112]. Figure 12A shows a 1D case, in which the structure is rotated from one cell to the next.…”

Section: Symmetry-related Applications With Spin-orbit Interactionmentioning

confidence: 99%

Spin-dependent optics with metasurfaces

et al. 2016

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Optical spin-Hall effect (OSHE) is a spindependent transportation phenomenon of light as an analogy to its counterpart in condensed matter physics. Although being predicted and observed for decades, this effect has recently attracted enormous interests due to the development of metamaterials and metasurfaces, which can provide us tailor-made control of the light-matter interaction and spin-orbit interaction. In parallel to the developments of OSHE, metasurface gives us opportunities to manipulate OSHE in achieving a stronger response, a higher efficiency, a higher resolution, or more degrees of freedom in controlling the wave front. Here, we give an overview of the OSHE based on metasurface-enabled geometric phases in different kinds of configurational spaces and their applications on spin-dependent beam steering, focusing, holograms, structured light generation, and detection. These developments mark the beginning of a new era of spin-enabled optics for future optical components.

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Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

Cited by 133 publications

References 32 publications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Light generation via quantum interaction of electrons with periodic nanostructures

Spin-dependent optics with metasurfaces

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