Implications of the causality principle for ultra chiral metamaterials

Gorkunov, M. V.; Дмитриенко, В. Е.; Ezhov, A. A.; Артемов, В. В.; Rogov, Oleg Y.

doi:10.1038/srep09273

Cited by 26 publications

(14 citation statements)

References 28 publications

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“…Moreover, chiroptical responses were studied in simple 1D metal grooves [33] and nanohole arrays [34]. Most of the chiral nanostructure fabrication involves sophisticated, challenging and expensive techniques; however, authors in [35][36][37] showed that complex chiral shapes can be produced in silver films by a conventional single-pass focused ion beam technique.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver

et al. 2020

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Arrays of nanoholes in metal are important plasmonic devices, proposed for applications spanning from biosensing to communications. In this work, we show that in such arrays the symmetry can be broken by means of the elliptical shape of the nanoholes, combined with the in-plane tilt of the ellipse axes away from the array symmetry lines. The array then differently interacts with circular polarizations of opposite handedness at normal incidence, i.e., it becomes intrinsically chiral. The measure of this difference is called circular dichroism (CD). The nanosphere lithography combined with tilted silver evaporation was employed as a low-cost fabrication technique. In this paper, we demonstrate intrinsic chirality and CD by measuring the extinction in the near-infrared range. We further employ numerical analysis to visualize the circular polarization coupling with the nanostructure. We find a good agreement between simulations and the experiment, meaning that the optimization can be used to further increase CD.

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Section: Introductionmentioning

confidence: 99%

Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver

et al. 2020

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“…The “Z-shaped” transverse waveguide is chiral in structure (i.e., the “Z-shaped” slot cannot be superimposed on its mirror image). The chiral structure will result in circular dichroism, i.e., different optical responses (e.g., reflection, transmission or absorption) for left-handed circularly polarized (LCP) incident light and right-handed circularly polarized (RCP) incident light, which has been observed and reported 14 18 24 . The observed chiral asymmetry in transmission between the left and right circular polarized incident light shown in Fig.…”

Section: Resultsmentioning

confidence: 96%

All-dielectric metasurface circular dichroism waveplate

Zhao

Lin

et al. 2017

Sci Rep

116

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We propose and experimentally demonstrate a high efficient circularly polarizing dichroism waveplate (CPDW) using a Si-based all-dielectric 2Dchiral metasurface. We demonstrate that the CPDW exhibits a unique dichroism in that it functions as a transmissive quarter waveplate for one of either left-or right-handed circularly polarized incident lightand a reflective mirror for the opposite polarization. The circular polarization dichroism (CPD = IRCP − ILCP) in transmission at wavelength ~1.5 μm reaches 97% and the extinction ratio (ER = IRCP/ILCP) is as high as 345:1. Experimental fabrications and measurements of the proposed all-dielectric metasurface are implemented and found to be in excellent agreement with the simulations. The proposed all-dielectric chiral metasurface is of advantages of high-dichroism, easy-fabrication and standard semiconductor fabrication techniques compatible, which could lead to enhanced security in fiber and free-space communications, as well as imaging and sensing applications for circularly polarized light with a highly integrated photonic platform.

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“…For a final check, we employ the Kramers-Kronig relations between OA and CD. Being well known for natural weakly chiral materials 37 , 43 , the relations can be generalized for strongly chiral metasurfaces 32 . Accordingly, we evaluate the spectrum of OA from the broadband spectrum of CD measured by the transmission ellipsometry.…”

Section: Resultsmentioning

confidence: 99%

Chiral visible light metasurface patterned in monocrystalline silicon by focused ion beam

Gorkunov

Rogov

Kondratov

et al. 2018

Sci Rep

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High refractive index makes silicon the optimal platform for dielectric metasurfaces capable of versatile control of light. Among various silicon modifications, its monocrystalline form has the weakest visible light absorption but requires a careful choice of the fabrication technique to avoid damage, contamination or amorphization. Presently prevailing chemical etching can shape thin silicon layers into two-dimensional patterns consisting of strips and posts with vertical walls and equal height. Here, the possibility to create silicon nanostructure of truly tree-dimensional shape by means of the focused ion beam lithography is explored, and a 300 nm thin film of monocrystalline epitaxial silicon on sapphire is patterned with a chiral nanoscale relief. It is demonstrated that exposing silicon to the ion beam causes a substantial drop of the visible transparency, which, however, is completely restored by annealing with oxidation of the damaged surface layer. As a result, the fabricated chiral metasurface combines high (50–80%) transmittance with the circular dichroism of up to 0.5 and the optical activity of up to 20° in the visible range. Being also remarkably durable, it possesses crystal-grade hardness, heat resistance up to 1000 °C and the inertness of glass.

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Implications of the causality principle for ultra chiral metamaterials

Cited by 26 publications

References 28 publications

Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver

Circular Dichroism in Low-Cost Plasmonics: 2D Arrays of Nanoholes in Silver

All-dielectric metasurface circular dichroism waveplate

Chiral visible light metasurface patterned in monocrystalline silicon by focused ion beam

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