175 citations · 200 across the 7 of their papers we have counts for
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Spectral Singularities with Directional Sensitivity
Hamidreza Ramezani
We propose a class of spectral singularities that are sensitive to the direction of excitation and are arising in nonlinear systems with broken parity symmetry. These spectral sing…
Diffraction-free beam propagation at the exceptional point of non-Hermitian Glauber Fock lattices
Cem Yuce, Hamidreza Ramezani
We construct localized beams that are located at the edge of a non-Hermitian Glauber Fock (NGF) lattice made of coupled waveguides and can propagate for a long distance without alm…
Non-diffracting states at exceptional points
Cem Yuce, Hamidreza Ramezani
We propose to use exceptional points (EPs) to construct diffraction-free beam propagation and localized power oscillation in lattices. Specifically, here we propose two systems to…
Robust localized zero-energy modes from locally embedded PT-symmetric defects
Fatemeh Mostafavi, Cem Yuce, Omar S. Magana-Loaiza +2
We demonstrate the creation of robust localized zero-energy states that are induced into topologically trivial systems by insertion of a PT-symmetric defect with local gain and los…
Robust Exceptional Points in Disordered Systems
Cem Yuce, Hamidreza Ramezani
We construct a theory to introduce the concept of topologically robust exceptional points (EP). Starting from an ordered system with elements, we find the necessary condition t…
Perfect Impedance-Matched Isolators and Unidirectional Absorbers
J. M. Lee, Z. Lin, H. Ramezani +4
A broad-band reflectionless channel which supports unidirectional wave propagation originating from the interplay between gyrotropic elements and symmetrically placed gain and loss…