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Bound states in the continuum in a two-dimensional PT-symmetric system
Yaroslav V. Kartashov, Carles Milian, Vladimir V. Konotop +1
We address a two-dimensional parity-time (PT)-symmetric structure built as a chain of waveguides, where all waveguides except for the central one are conservative, while the centra…
Coherent-perfect-absorber and laser for bound states in a continuum
Bikashkali Midya, Vladimir V. Konotop
It is shown that two fundamentally different phenomena, the bound states in continuum and the spectral singularity (or time-reversed spectral singularity), can occur simultaneously…
Solitons in a - symmetric coupler
M. Ogren, F. Kh. Abdullaev, V. V. Konotop
We consider the existence and stability of solitons in a coupler. Both the fundamental and second harmonics undergo gain in one of the coupler cores and are absorbed in t…
Phase transition through the splitting of self-dual spectral singularity in optical potentials
Vladimir V. Konotop, Dmitry A. Zezyulin
We consider optical media which feature antilinear symmetries. We show that: (i) spectral singularities of such media (if any) are always self-dual, i.e., correspond to CPA-lasers;…
Waveguides with Absorbing Boundaries: Nonlinearity Controlled by an Exceptional Point and Solitons
Bikashkali Midya, Vladimir V. Konotop
We reveal the existence of continuous families of guided single-mode solitons in planar waveguides with weakly nonlinear active core and absorbing boundaries. Stable propagation of…
-symmetric coupler with intermodal dispersion
Dmitry A. Zezyulin, Yaroslav V. Kartashov, Vladimir V. Konotop
A dual-core waveguide with balanced gain and loss in different arms and with intermodal coupling is considered. The system is not invariant under the conventional symmetry but…