Meta-Optical Chirality and Emergent Eigen-polarization Modes via Plasmon Interactions

Moocarme, Matthew; Proscia, Nicholas V.; Vuong, Luat T.

doi:10.1038/srep40718

Cited by 4 publications

(1 citation statement)

References 41 publications

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“…Кроме того, отметим, что существуют системы и с большим числом СП. Так, например, в работе [30] изучена метаповерхность, состоящая из наклонных ахиральных метаатомов без пространственного изменения элементарной ячейки, которая показывает заметную оптическую хиральность исключительно из асимметричных взаимодействий между метаатомами. В такой системе авторами измерены шесть СП мод.…”

Section: результатыunclassified

Влияние Направления Внешнего Магнитного Поля На Зонную Структуру Магнитофотонных Кристаллов

Геворгян¹,

Голик²,

Геворгян³

2018

Журнал Технической Физики

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Section: результатыunclassified

Влияние Направления Внешнего Магнитного Поля На Зонную Структуру Магнитофотонных Кристаллов

Геворгян¹,

Голик²,

Геворгян³

2018

Журнал Технической Физики

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Nonlinear circular dichroism in achiral dielectric nanoparticles

Anastasiya

Nikolaeva²,

Frizyuk³

2023

Phys. Rev. B

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In this study, we investigate the nonlinear optical phenomena emerging from the interaction of vortex beams with achiral nanoparticles, leading to the observation of nonlinear circular dichroism in the high-harmonic generation. Despite the achiral symmetry of the nanoparticles, the interplay between the vector properties of the light, the symmetry of the nanoparticles, and the symmetry of the crystalline lattice of the nanoparticle material leads to circular dichroism in the nonlinear regime. We derive a formula that describes the conditions for the appearance of circular dichroism across all possible scenarios, taking into account all the symmetries. We also show that the absolute value of the incident beam's orbital angular momentum does not play a major role. We believe that this work provides important insights that can help in improvement the design process of chiral sensors, making them more versatile and effective.

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Chiral Quasi-Bound States in the Continuum

2021

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Quasi-bound states in the continuum (q-BICs) are resonant states of suitably tailored nanostructures with long optical lifetimes controlled by symmetry-breaking perturbations. While in planarized ultrathin devices the resulting Fano resonance is limited to linear polarization, we show here that chiral perturbations extend q-BIC concepts to arbitrary elliptical polarizations.Using geometric phase engineering, we realize metasurfaces with ultrasharp Fano spectral features that can shape the impinging wavefront with near-unity efficiency, while at the same time precisely filtering their spectral content.Suitably designed photonic crystal slabs (PCSs) have been recently shown to support quasi-bound states in the continuum (q-BICs), opening new opportunities to enhance and control light-matter interactions. Q-BICs are modes whose radiative lifetime is controlled by a symmetry-lowering perturbation [1]; they would be ideally non-radiating states [2]-[4] due to symmetry-protection in the absence of perturbation, despite their momentum being compatible with coupling energy to the radiation continuum. When light with a polarization state matching the eigenpolarization of the q-BIC impinges on the structure, an ultrasharp Fano response arises [5], and the resonantly scattered light maintains the same polarization. This property, combined with strong in-plane Bragg scattering in high-contrast index systems [6], enables compact optical devices concentrating light 2 in both space and time [7]- [11]. By perturbing every other unit cell in such systems, the Brillouin zone folds, enabling access to previously bound modes and providing additional design freedom to control q-BICs in real-and momentum-space [10]- [13]. Photonic crystals supporting q-BICs hence offer a highly versatile platform for biological sensing [14], planar optical modulators [15], notch filters [16] and nonlinear optics [17], [18].Recently, the selection rules for q-BICs in planar photonic crystals have been classified for both mono-atomic and multi-atomic lattices, clarifying to which (if any) free-space polarization state a q-BIC may couple due to a chosen symmetry perturbation [13]. This result implies that in planar structures that preserve symmetry across a horizontal plane, the q-BIC polarization must necessarily be linear. By adiabatically varying the polarization angle of the supported q-BICs in the lateral direction and thereby introducing a spatial variation of the geometric phase, it is possible to tailor the impinging wavefront and realize metasurface functionalities, such as anomalous reflection and refraction for circularly polarized light emanating from the metasurface [19].However, due to the planarized symmetry and the linear polarization constraint, the maximum achievable efficiency of wavefront shaping is 25% [20].Breaking this symmetry with the introduction of optical chirality may enable devices with strong circular dichroism [22]- [29]. Recent work has demonstrated metasurfaces that leverage this principle by varying the geometric phase ...

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Meta-Optical Chirality and Emergent Eigen-polarization Modes via Plasmon Interactions

Cited by 4 publications

References 41 publications

Влияние Направления Внешнего Магнитного Поля На Зонную Структуру Магнитофотонных Кристаллов

Влияние Направления Внешнего Магнитного Поля На Зонную Структуру Магнитофотонных Кристаллов

Nonlinear circular dichroism in achiral dielectric nanoparticles

Chiral Quasi-Bound States in the Continuum

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