Circular dichroism induced by Fano resonances in planar chiral oligomers

  title={Circular dichroism induced by Fano resonances in planar chiral oligomers},
  author={Ben Hopkins and Alexander N. Poddubny and Andrey E. Miroshnichenko and Yuri S. Kivshar},
  journal={Laser \& Photonics Reviews},
We present a general theory of circular dichroism in planar chiral nanostructures with rotational symmetry. It is demonstrated, analytically, that the handedness of the incident field's polarization can control whether a nanostructure induces either absorption or scattering losses, even when the total optical loss (extinction) is polarization‐independent. We show that this effect is a consequence of modal interference so that strong circular dichroism in absorption and scattering can be… 

Circular dichroism from Fano resonances in planar chiral oligomers

Here we present a general approach for describing the physics of Fano resonances in nanoparticle oligomers. It is shown that the interference of nonorthogonal collective eigenmodes is a sufficient

Fano-Induced Circular Dichroism in Three-Dimensional Plasmonic Chiral Metamolecules

  • K. Q. Le
  • Physics
    Journal of Electronic Materials
  • 2017
This paper introduces a three-dimensional (3-D) artificial chiral nanostructure, which has variant total optical loss spectroscopies under left- and right-handed circularly polarized (LCP and RCP)

Nonlinear Circular Dichroism in Mie-Resonant Nanoparticle Dimers.

A general theory describing hybridization of multipolar modes of the coupled nanoparticles is developed and nonvanishing nonlinear circular dichroism in the second-harmonic generation (SHG) signal enhanced by the multipolar resonances in the dimer is revealed.

Chirality of Symmetric Resonant Heterostructures

Chiroptical effects arising in mirror‐symmetric geometrically achiral resonant heterostructures are investigated. It is shown that coalescence of extrinsic chirality, heterogeneous morphology, and

Metasurfaces with Maximum Chirality Empowered by Bound States in the Continuum.

It is demonstrated that rotationally symmetric chiral metasurfaces can support sharp resonances with the maximum optical chirality determined by precise shaping of bound states in the continuum (BICs), and a realization of such chiral BIC metAsurfaces based on pairs of dielectric bars is proposed.

Enhanced circular dichroism of double L-shaped nanorods induced by gap plasmon coupling

Chirality is important in the fields of science and engineering. In comparison to 3D nanostructures, planar nanostructures have a great advantage of easy fabrication. However, previous studies on

Fano Resonance Enhanced Nonreciprocal Absorption and Scattering of Light

We reveal that asymmetric plasmonic nanostructures can exhibit significantly different absorption and scattering properties for light that propagates in opposite directions, despite the conservation

Substrate-Induced Chirality in an Individual Nanostructure

We experimentally investigate the chiral optical response of an individual nanostructure consisting of three equally sized spherical nanoparticles made of different materials and arranged in \ang{90}

Enhancing circular dichroism by super chiral hot spots from a chiral metasurface with apexes

Manipulating light spin (or circular polarization) is an important research field and may find broad applications from sensors, display technology, to quantum computing and communication. To this

Twisting Fluorescence through Extrinsic Chiral Antennas.

This work shows that the design of extrinsic chiral surfaces can be optimized with complex multipolar resonances in order to twist the fluorescence emission from nearby molecules and lead to the development of polarization- and angle-resolved ultracompact optical devices.



Plasmonic ratchet wheels: switching circular dichroism by arranging chiral nanostructures.

We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since

Circularly polarized light emission from chiral spatially-structured planar semiconductor microcavities

We demonstrate a method for control of the polarization of emission of quantum dots (QDs) embedded in an active layer of a planar microcavity. This method involves a modification of the

Giant chiral optical response from a twisted-arc metamaterial.

It is shown that enormously strong chiral effects from a photonic metamaterial consisting of an array of dual-layer twisted-arcs with a total thickness of ∼ λ/6.5% can be demonstrated from a near-infrared wavelength region.

Fano resonances in all-dielectric oligomers.

It is demonstrated that light scattering by all-dielectric oligomers exhibits well-pronounced Fano resonances with strong suppression of the scattering cross section, which makes them promising for future applications in nanophotonics.

Polarization control of quantum dot emission by chiral photonic crystal slabs.

The polarization properties of the quantum dot's (QDs) optical emission from chiral photonic crystal structures made of achiral materials in the absence of external magnetic field at room temperature are investigated.

Metamaterial with negative index due to chirality

Recently it has been predicted that materials with exceptionally strong optical activity may also possess a negative refractive index, allowing the realization of superlenses for super-resolution

Revisiting the physics of Fano resonances for nanoparticle oligomers

We present a new and robust approach for interpreting the physics of Fano resonances in planar oligomer structures of both metallic and dielectric nanoparticles. We reveal a key mechanism for Fano

Polarization-controlled circular second-harmonic generation from metal hole arrays with threefold rotational symmetry.

It is demonstrated that, in achiral nanostructures with threefold rotational symmetries, a circularly polarized fundamental beam produces a countercircularly polarized second-harmonic beam.

Ohmic loss produces chiral dichroism in plasmonic metasurfaces: First experimental demonstration

A combination of experimental techniques is used to demonstrate that optical field concentration and Ohmic losses in planar chiral plasmonic metasurfaces depends on the handedness of circularly

Symmetry-selective third-harmonic generation from plasmonic metacrystals.

It is shown that the selection rule can be imposed by the rotational symmetry of metacrystals embedded into an isotropic organic nonlinear thin film, which may open new avenues for designing symmetry-dependent nonlinear optical responses with tailored plasmonic nanostructures.