A physical interpretation of coupling chiral metaatoms

Cao, Zhaolong; Chen, Jianfa; Deng, S.Z.; Chen, Huanjun

doi:10.1039/d1nr05065f

Cited by 4 publications

(3 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(d) is that the field profile has a spatial inversion symmetry, which will allow the local response to be birefringent. 49 In combination with the lack of any in-plane mirror symmetry, the metasurface will manifest the inherent planar chirality, [62][63][64] and the intrinsic BIC thus is enclosed by vortex elliptical eigen polarizations with non-vanishing helicity, as already shown in Fig. 2(c).…”

Section: Structure and Principlementioning

confidence: 86%

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Zhou

Wei

et al. 2023

Nanoscale

View full text Add to dashboard Cite

show abstract

Section: Structure and Principlementioning

confidence: 86%

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Zhou

Wei

et al. 2023

Nanoscale

View full text Add to dashboard Cite

show abstract

“…[15] However, chiroptical effects at optical frequencies are extremely weak and a medium with strong chiroptical effects is still challenging to achieve. [16][17][18][19] Recently, metallic and high-index dielectric nanoparticles have intrigued extensive interest due to their exceptional ability to manipulate and confine photons at subwavelength scales. [20,21] Despite the differences in their underlying physical mechanisms, both plasmonic nanostructures and Mie cavities demonstrate a strong capacity to interact with light, which can be comprehended within the conceptual framework of optical resonators.…”

Section: Introductionmentioning

confidence: 99%

“…[ 15 ] However, chiroptical effects at optical frequencies are extremely weak and a medium with strong chiroptical effects is still challenging to achieve. [ 16–19 ]…”

Section: Introductionmentioning

confidence: 99%

Rigorous Modal Analysis of Chiral Nanoparticles

Cao

Deng

et al. 2023

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

The physical origins of the chiroptical response from nanostructures are highly demanded for chiral photonics. The chiroptical response of a nanoparticle, whether measured along specific incident directions of exciting waves (when immobilized onto a substrate) or in solution through averaging responses across all structure orientations, is believed to stem from the interplay between three key factors: geometrical chirality, far‐field chirality, and near‐field chirality. This study aims to understand the relationship among these factors using a rigorous quasinormal mode (QNM) expansion method. By decomposing circular dichroism (CD) spectra into individual QNM contributions, it is observed that the chiroptical response with respect to incident directions depends on the extent of field overlapping between the QNM and light. In contrast, the near‐field optical chirality (OC) is determined by the QNMs of the nanoparticle, independent of external excitations. As a proof‐of‐concept, a nanohelix metasurface is proposed that employs lossless gold and exploits the physics of bound states in the continuum to maximize the CD signal.

show abstract

Brillouin Zone Folding Metasurface for Near Perfect Circular Dichroism

Yan,

Xie,

Chen

et al. 2024

Advanced Optical Materials

View full text Add to dashboard Cite

Planar chiral metasurfaces have demonstrated their proficiency in manipulating chiral light‐matter interactions for diverse applications. Nevertheless, it proves arduous to simultaneously attain elevated quality factors and potent chirality response. In this work, a planar chiral metasurface is proposed, that supports Brillouin zone folding‐induced bound states in the continuum (BZF‐BICs) featuring a high‐Q factor resonance and near‐perfect circular dichroism response. By introducing periodic perturbation and breaking symmetry, the BZF‐BICs exhibit a folded band structure and decreased radiative channels, leading to a superior quality factor relative to unfolded quasi‐BICs. Exploiting the topological nature of BZF‐BICs, the polarization singularity is eradicated, resulting in the appearance of two elliptical eigenstate polarizations. Consequently, an almost perfect circular dichroism response is demonstrated due to the selective coupling between the eigenstate and the incident light. Furthermore, it is revealed that the symmetry of the distribution of eigenstates in the BZF‐BICs lattice is determined by the perturbed cell, and the more intricate orthogonal polarization states can be distinguished through the Brillouin zone design, enabling the splitting of complex polarization state beams. This study presents an innovative method for creating easily fabricated chiral metasurfaces and holds promise for applications in biochemical sensing, emission, lasing, quantum optics, and nonlinear optics.

show abstract

A physical interpretation of coupling chiral metaatoms

Abstract: The physical origins of chiroptical response from artificial optical active media lie at the heart for developing high-performing circular dichroism (CD) spectroscopic techniques. Here, we present a biorthogonal approach to...

Cited by 4 publications

References 61 publications

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Rigorous Modal Analysis of Chiral Nanoparticles

Brillouin Zone Folding Metasurface for Near Perfect Circular Dichroism

Contact Info

Product

Resources

About