Zobrazeno 1 - 10
of 156
pro vyhledávání: '"Fung, Kin Hung"'
Autor:
Yau, Wang Tat, Lee, Kai Fung, Wu, Raymond P. H., Wong, Wai Chun, Li, Jensen, Chan, 1 C. T., Fung, Kin Hung
We study the complex band hybridization induced by nonreciprocal local resonances in photonic crystals. Composed of trimer unit cells, a two-dimensional (2D) magnetophotonic crystal with an analytically obtainable solution is considered. We find that
Externí odkaz:
http://arxiv.org/abs/2409.20462
Publikováno v:
Phys. Rev. Research 3, 022006 (2021)
We show that Maxwell's demon-like nonreciprocity can be supported in a class of non-Hermitian gyrotropic metasurfaces in the linear regime. The proposed metasurface functions as a transmission-only Maxwell's demon operating at a pair of photon energi
Externí odkaz:
http://arxiv.org/abs/2012.14677
Publikováno v:
Phys Rev B (Rapid Comm) 101, 121405(R) (2020)
We introduce topological theory of perfect isolation: perfect transmission from one side and total reflection from another side simultaneously. The theory provides an efficient approach for determining whether such a perfect isolation point exists wi
Externí odkaz:
http://arxiv.org/abs/2003.05170
Publikováno v:
Phys. Rev. B 101, 054107 (2020)
Using both multiple scattering theory and effective medium theory, we find that an acoustic metamaterial consisting of an array of spinning cylinders can possess a host of unusual properties including folded bulk and interface-state bands in the subw
Externí odkaz:
http://arxiv.org/abs/1905.07170
Publikováno v:
Phys. Rev. B 98, 014110 (2018)
Topological phononic crystals (PCs) are periodic artificial structures which can support nontrivial acoustic topological bands, and their topological properties are linked to the existence of topological edge modes. Most previous studies focused on t
Externí odkaz:
http://arxiv.org/abs/1712.04252
The trapped rainbow effect has been mostly found on tapered anisotropic metamaterials (MMs) made of low loss noble metals, such as gold, silver, etc. In this work, we demonstrate that an anisotropic MM waveguide made of high loss metal tungsten can a
Externí odkaz:
http://arxiv.org/abs/1610.09436
Publikováno v:
Opt. Lett. 42, 535-538 (2017)
We demonstrate theoretically the electric tunability due to coalescence of exceptional points in PT-symmetric waveguides bounded by imperfect conductive layers. Owing to the competition effect of multimode interaction, multiple exceptional points and
Externí odkaz:
http://arxiv.org/abs/1610.04366
Publikováno v:
Sci. Rep. 6 38049 (2016)
Robust topological edge modes may evolve into complex-frequency modes when a physical system becomes non-Hermitian. We show that, while having negligible forward optical extinction cross section, a conjugate pair of such complex topological edge mode
Externí odkaz:
http://arxiv.org/abs/1606.05851
Publikováno v:
Opt. Lett. 41, 1644 (2016)
We show theoretically that, in the limit of weak dispersion, one-dimensional (1D) binary centrosymmetric photonic crystals can support topological edge modes in all photonic band gaps. By analyzing their bulk band topology, these "harmonic" topologic
Externí odkaz:
http://arxiv.org/abs/1602.03630
Autor:
Kumar, Anshuman, Nemilentsau, Andrei, Fung, Kin Hung, Hanson, George, Fang, Nicholas X., Low, Tony
Publikováno v:
Phys. Rev. B 93, 041413(R) (2016)
We study the electromagnetic response and surface electromagnetic modes in a generic gapped Dirac material under pumping with circularly polarized light. The valley imbalance due to pumping leads to a net Berry curvature, giving rise to a finite tran
Externí odkaz:
http://arxiv.org/abs/1509.00790