Effective wave motion in periodic discontinua near spectral singularities at finite frequencies and wavenumbers
Sign Up to like & getrecommendations! Published in 2021 at "Wave Motion"
DOI: 10.1016/j.wavemoti.2021.102729
Abstract: Abstract We consider the effective wave motion, at spectral singularities such as corners of the Brillouin zone and Dirac points, in periodic continua intercepted by compliant interfaces that pertain to e.g. masonry and fractured materials. We… read more here.
Keywords: dispersion; effective wave; spectral singularities; wave motion ... See more keywords
Chiral spectral singularities spawning from quasi-bound states in the continuum in PT-symmetric dielectric metasurfaces
Sign Up to like & getrecommendations! Published in 2023 at "Applied Physics Letters"
DOI: 10.1063/5.0145987
Abstract: We investigate the chiral spectral singularities, i.e., laser threshold modes, in PT-symmetric dielectric metasurfaces originating from quasi-bound states in the continuum. The poles, referred to as the quasi-bound states in the continuum, of scattering matrix… read more here.
Keywords: bound states; states continuum; symmetric dielectric; quasi bound ... See more keywords
Asymmetric lasing at spectral singularities
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review A"
DOI: 10.1103/physreva.97.033840
Abstract: Scattering coefficients can diverge at spectral singularities. In such situation, the stationary solution becomes a laser solution with outgoing waves only. We explore a parity-time $(\mathcal{PT})$-symmetric non-Hermitian two-arm Aharonov-Bohm interferometer consisting of three coupled resonators… read more here.
Keywords: magnetic flux; lasing spectral; spectral singularities; synthetic magnetic ... See more keywords
Spectral singularities of odd- PT -symmetric potentials
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DOI: 10.1103/physreva.99.013823
Abstract: We describe one-dimensional stationary scattering of a two-component wave field by a non-Hermitian matrix potential which features odd-$PT$ symmetry, i.e., symmetry with $(PT)^2=-1$. The scattering is characterized by a $4\times 4$ transfer matrix. The main… read more here.
Keywords: odd symmetric; singularities odd; transfer matrix; symmetric potentials ... See more keywords