Zobrazeno 1 - 10
of 281
pro vyhledávání: '"Lu, Ya Yan"'
Autor:
Zhang, Nan, Lu, Ya Yan
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 determine the asymptotic behavior of $Q$-factor and the far-field polari
Externí odkaz:
http://arxiv.org/abs/2408.08162
Autor:
Zhang, Nan, Lu, Ya Yan
Many photonic devices, such as photonic crystal slabs, cross gratings, and periodic metasurfaces, are biperiodic structures with two independent periodic directions, and are sandwiched between two homogeneous media. Many applications of these devices
Externí odkaz:
http://arxiv.org/abs/2403.04459
Autor:
Zhang, Nan, Lu, Ya Yan
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 outwards in the lateral direction; i.e., there are lateral leakage ch
Externí odkaz:
http://arxiv.org/abs/2311.13948
Autor:
Mai, Zitao, Lu, Ya Yan
When a plane electromagnetic wave impinges upon a diffraction grating or other periodic structures, reflected and transmitted waves propagate away from the structure in different radiation channels. A diffraction anomaly occurs when the outgoing wave
Externí odkaz:
http://arxiv.org/abs/2206.13899
Photonic structures with high-$Q$ resonances are essential for many practical applications, and they can be relatively easily realized by modifying ideal structures with bound states in the continuum (BICs). When an ideal photonic structure with a BI
Externí odkaz:
http://arxiv.org/abs/2205.09951
For lossless periodic structures with a proper symmetry, the transmission and reflection spectra often have peaks and dips that are truly $100\%$ and $0\%$, respectively. The full peaks and zero dips typically appear near resonant frequencies, and th
Externí odkaz:
http://arxiv.org/abs/2205.03771
Autor:
Abdrabou, Amgad, Lu, Ya Yan
In a lossless periodic structure, a bound state in the continuum (BIC) is characterized by a real frequency and a real Bloch wavevector for which there exist waves propagating to or from infinity in the surrounding media. For applications, it is impo
Externí odkaz:
http://arxiv.org/abs/2203.11511
A linear scattering problem for which incoming and outgoing waves are restricted to a finite number of radiation channels can be precisely described by a frequency-dependent scattering matrix. The entries of the scattering matrix, as functions of the
Externí odkaz:
http://arxiv.org/abs/2202.06324
Resonant modes in a lossy periodic structure sandwiched between two lossless homogeneous media form bands that depend on the Bloch wavevector continuously and have a complex frequency due to radiation and absorption losses. A complex bound state in t
Externí odkaz:
http://arxiv.org/abs/2108.05501
Autor:
Zhang, Nan, Lu, Ya Yan
At a fixed frequency, a general wave field in an open optical waveguide is a sum of finite number of guided modes and an integral of radiation modes. Most studies on open lossless dielectric waveguides are concerned with regular guided modes which ar
Externí odkaz:
http://arxiv.org/abs/2106.11462