Extrinsic 2D chirality: giant circular conversion dichroism from a metal-dielectric-metal square array

Cao, Tun; Wei, Chen-Wei; Mao, Libang; Li, Yang

doi:10.1038/srep07442

Cited by 105 publications

(75 citation statements)

References 48 publications

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Section: Design Of Chiral Materialsmentioning

confidence: 99%

“…Cao et al demonstrated, experimentally and numerically, strong circular dichroism in the mid‐IR region (∼2.4 µm), resulting from extrinsic chirality in achiral nanostructures . The structures consisted of a rectangular array of thin gold squares, separated by a dielectric layer (GaAs) atop a continuous gold film (Figure c).…”

Section: Design Of Chiral Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

301

246

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Throughout the 19th and 20th century, chirality has mostly been associated with chemistry. However, while chirality can be very useful for understanding molecules, molecules are not well suited for understanding chirality. Indeed, the size of atoms, the length of molecular bonds and the orientations of orbitals cannot be varied at will. It is therefore difficult to study the emergence and evolution of chirality in molecules, as a function of geometrical parameters. By contrast, chiral metal nanostructures offer an unprecedented flexibility of design. Modern nanofabrication allows chiral metal nanoparticles to tune the geometric and optical chirality parameters, which are key for properties such as negative refractive index and superchiral light. Chiral meta/nano‐materials are promising for numerous technological applications, such as chiral molecular sensing, separation and synthesis, super‐resolution imaging, nanorobotics, and ultra‐thin broadband optical components for chiral light. This review covers some of the fundamentals and highlights recent trends. We begin by discussing linear chiroptical effects. We then survey the design of modern chiral materials. Next, the emergence and use of chirality parameters are summarized. In the following part, we cover the properties of nonlinear chiroptical materials. Finally, in the conclusion section, we point out current limitations and future directions of development.

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Section: Design Of Chiral Materialsmentioning

confidence: 99%

Section: Design Of Chiral Materialsmentioning

confidence: 99%

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

301

246

View full text Add to dashboard Cite

show abstract

“…Subsequently, we calculate the current distribution at resonant frequencies to further analyze the origin of asymmetric transmission, and the mode analysis based on current distribution is consistent with the magnetic field distribution . As shown in Figure 3a,b, the current density equally distributes along the sides of original metamaterials, which forms the magnetic mode perpendicular to the metamaterial surface.…”

Section: Resultsmentioning

confidence: 67%

“…Incident angle tuning is another way to manipulate the chiral response of metamaterials due to the emergent extrinsic chirality under oblique incidence . The circular dichroism (

Δ = | t_{+ +} |^{2} - | t_{- -} |^{2}

) of metamaterials under different incident angles are calculated.…”

Section: Resultsmentioning

confidence: 99%

Giant Asymmetric Transmission and Circular Dichroism with Angular Tunability in Chiral Terahertz Metamaterials

Liu

Huang

et al. 2020

Annalen der Physik

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Inspired by the chiral structure from mode interaction, a chiral terahertz metamaterial and its complementary structure with the coexistence of asymmetric transmission and circular dichroism response are designed. The asymmetric transmission happens in the presence of electric and magnetic modes perpendicular to each other, resulting from intrinsic chirality under normal incidence. Circular dichroism exists in the presence of electric and magnetic modes parallel to each other under oblique incidence because of extrinsic chirality. Both asymmetric transmission and circular dichroism are enhanced by complementary structures, benefitting from the coupling between adjacent units. The maximum of chiral parameter κ can achieve 450, which is one hundred times higher than previously reported. The chiral response can be tuned by the incident angle and is sensitive to the environmental refractive index. The results highlight the potential applications of these metamaterials in chiral sensing and polarization transformation devices.

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“…The presence of metamaterials makes it possible for us to obtain strong chirality. In the past few years, chiral metamaterials (CMMs) have been constructed to realize negative refractive index [15][16][17][18][19][20] , strong optical activity [21][22][23][24][25] , circular dichroism [26][27][28][29][30] , as well as asymmetric transmission [31][32][33][34][35] . Using strong resonances, the optical rotatory power of CMMs might rise up to several orders of magnitudes larger than that of natural substances [36][37][38][39][40] .…”

Section: Introductionmentioning

confidence: 99%

Broadband angle- and permittivity-insensitive nondispersive optical activity based on planar chiral metamaterials

Song

Wang

et al. 2017

Sci Rep

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Because of the strong inherent resonances, the giant optical activity obtained via chiral metamaterials generally suffers from high dispersion, which has been a big stumbling block to broadband applications. In this paper, we propose a type of planar chiral metamaterial consisting of interconnected metal helix slat structures with four-fold symmetry, which exhibits nonresonant Drude-like response and can therefore avoid the highly dispersive optical activity resulting from resonances. It shows that the well-designed chiral metamaterial can achieve nondispersive and pure optical activity with high transmittance in a broadband frequency range. And the optical activity of multi-layer chiral metamaterials is proportional to the layer numbers of single-layer chiral metamaterial. Most remarkably, the broadband behaviors of nondispersive optical activity and high transmission are insensitive to the incident angles of electromagnetic waves and permittivity of dielectric substrate, thereby enabling more flexibility in polarization manipulation.

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Extrinsic 2D chirality: giant circular conversion dichroism from a metal-dielectric-metal square array

Cited by 105 publications

References 48 publications

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Giant Asymmetric Transmission and Circular Dichroism with Angular Tunability in Chiral Terahertz Metamaterials

Broadband angle- and permittivity-insensitive nondispersive optical activity based on planar chiral metamaterials

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