Moiré Quasibound States in the Continuum

Huang, Lei; Zhang, Weixuan; Zhang, Xiangdong

doi:10.1103/physrevlett.128.253901

Cited by 55 publications

(30 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…45 Recently, flat bands utilizing the interlayer couplings and/or intralayer couplings were demonstrated in twisted bilayer photonic slabs 95 and applied to angular-robust harmonic enhancements. 96 Enhanced secondharmonic generation with focused beam incidence was achieved thanks to the flat-band Moiréquasi-BICs. 96 The transition between local and nonlocal modes is expected to underpin flexible manipulation of optical harmonics, which is highly desirable in nonlinear optical switching and on-chip communications.…”

Section: ■ Novel Optical Effectsmentioning

confidence: 99%

Emerging Planar Nanostructures Involving Both Local and Nonlocal Modes

Chai

Liu

et al. 2023

ACS Photonics

View full text Add to dashboard Cite

With the capabilities to localize light at the subwavelength scale and flexibly control the full dimensions of electromagnetic fields, planar optical artificial nanostructures have been widely explored to innovate next-generation multifunctional compact photonic devices in recent decades. To further improve the efficiency, quality (Q) factors, and design degrees of freedom of photonic devices, recent research advances have brought in comprehensive consideration of both local and nonlocal modes in nanostructures with blurred distinctions between metasurfaces and photonic crystals. In this Perspective, we review the recent progress in planar nanophotonics involving localized resonances, nonlocal modes, and their couplings. Many intriguing physical effects correlated to local and/or nonlocal modes and the corresponding applications are reviewed, as well as large-area optimization strategies to directly simulate local and nonlocal optical responses. We also summarize several current challenges and foresee various future directions of the attractive field.

show abstract

Section: ■ Novel Optical Effectsmentioning

confidence: 99%

Emerging Planar Nanostructures Involving Both Local and Nonlocal Modes

Chai

Liu

et al. 2023

ACS Photonics

View full text Add to dashboard Cite

show abstract

“…23 in the one-dimensional PhCS, the lack of rotation asymmetry still ends up with unidirectional guided resonances with global charge of zero. Most recently, the concept of twistronics has been extended from twodimensional heterostructures to optics like twist-stacked metamaterials and chiral PhCS, which provide new platforms for tailoring chiral-optical effects and elliptical polarizations with new degree of freedom [27][28][29][30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs

Qin

Liu

et al. 2023

Light Sci Appl

View full text Add to dashboard Cite

Arbitrary polarized vortex beam induced by polarization singularity offers a new platform for both classical optics and quantum entanglement applications. Bound states in the continuum (BICs) have been demonstrated to be associated with topological charge and vortex polarization singularities in momentum space. For conventional symmetric photonic crystal slabs (PhCSs), BIC is enclosed by linearly polarized far fields with winding angle of 2π, which is unfavorable for high-capacity and multi-functionality integration-optics applications. Here, we show that by breaking σz-symmetry of the PhCS, asymmetry in upward and downward directions and arbitrarily polarized BIC can be realized with a bilayer-twisted PhCS. It exhibits elliptical polarization states with constant ellipticity angle at every point in momentum space within the vicinity of BIC. The topological nature of BIC reflects on the orientation angle of polarization state, with a topological charge of 1 for any value of ellipticity angle. Full coverage of Poincaré sphere (i.e., $$- {{\pi \over 4}} \le \chi \le {{\pi \over 4}}$$ − π 4 ≤ χ ≤ π 4 and $$- {{\pi \over 2}} \le \psi \le {{\pi \over 2}}$$ − π 2 ≤ ψ ≤ π 2 ) and higher-order Poincaré sphere can be realized by tailoring the twist angles. Our findings may open up new avenues for applications in structured light, quantum optics, and twistronics for photons.

show abstract

“…Interpreting the isobar experimental results has recently become a hot research direction. For example, different nuclear deformations or nuclear structures have been used to explain the differences in multiplicity and harmonic flows between the two isobar systems [43][44][45][46][47][48]. Considering both the halo-type neutron skin structure and CME-like charge separation, we have demonstrated that it is difficult for the CME observables to distinguish the presence or absence of the CME, if the CME strength is weak in isobar collisions [49].…”

Section: Introductionmentioning

confidence: 99%