7 papers
Amplitude analysis for charmed meson decays at BESIII
Han Zhang, Zhenxuan Li, Chunyi Guan +9
Amplitude analysis bridges the gap between experimental measurements of multibody charmed-meson decays and theoretical predictions of intermediate two-body processes. This work pre…
Asymptotically circularly polarized bound states in the continuum
Nan Zhang, Ya Yan Lu
We study a class of bound states in the continuum (BICs) in all-dielectric periodic structures, near which resonant states approach ideal circularly polarized states (CPSs). We ter…
Exploiting nonlinear incoherent image formation through linear volume metaoptics for inference
Nan Zhang, Arvin Keshvari, Ata Shakeri +1
We showed that a 2D depth map representing an incoherent 3D opaque scene is directly encoded in the response function of an imaging optics. As a result, the optics creates an image…
Super Bound States in the Continuum: Analytic Framework, Parametric Dependence, and Fast Direct Computation
Nan Zhang, Ya Yan Lu
In periodic structures such as photonic crystal (PhC) slabs, a bound state in the continuum (BIC) is always surrounded by resonant states with their -factor following $Q\sim 1/|…
Perturbation theory for resonant states near a bound state in the continuum
Nan Zhang, Ya Yan Lu
In this work, we develop a perturbation theory to analyze resonant states near a bound state in the continuum (BIC) in photonic crystal slabs. The theory allows us to rigorously de…
An efficient method for calculating resonant modes in biperiodic photonic structures
Nan Zhang, Ya Yan Lu
Many photonic devices, such as photonic crystal slabs, cross gratings, and periodic metasurfaces, are biperiodic structures with two independent periodic directions, and are sandwi…
Non-generic bound states in the continuum in waveguides with lateral leakage channels
Nan Zhang, Ya Yan Lu
For optical waveguides with a layered background which itself is a slab waveguide, a guided mode is a bound state in the continuum (BIC), if it coexists with slab modes propagating…