Unidirectional wave vector manipulation in two-dimensional space with an all passive acoustic parity-time-symmetric metamaterials crystal

T Liu, X Zhu, F Chen, S Liang, J Zhu - Physical review letters, 2018 - APS
Exploring the concept of non-Hermitian Hamiltonians respecting parity-time symmetry with
classical wave systems is of great interest as it enables the experimental investigation of …

Machine learning for knowledge acquisition and accelerated inverse-design for non-Hermitian systems

WW Ahmed, M Farhat, K Staliunas, X Zhang… - Communications …, 2023 - nature.com
Non-Hermitian systems offer new platforms for unusual physical properties that can be
flexibly manipulated by redistribution of the real and imaginary parts of refractive indices …

Revisit the Poynting vector in P T-symmetric coupled waveguides

XZ Zhang, RZ Luo, J Chen - Optics Express, 2022 - opg.optica.org
We show that the time-averaged Poynting vector of S?= E?× H?^∗/2 in parity-time (PT)
symmetric coupled waveguides is always positive and cannot explain the stopped light at …

Non-Hermitian arrangement for stable semiconductor laser arrays

JM Pardell, R Herrero, M Botey, K Staliunas - Optics express, 2021 - opg.optica.org
We propose and explore a physical mechanism for the stabilization of the complex
spatiotemporal dynamics in arrays (bars) of broad area laser diodes taking advantage of the …

[HTML][HTML] Non-Hermitian control of optical turbulence in systems with fractional dispersion

SB Ivars, M Botey, R Herrero, K Staliunas - Chaos, Solitons & Fractals, 2022 - Elsevier
We show an efficient mechanism to control optical turbulence in systems with different
dispersion laws, including parabolic, sub-diffractive, hyper-diffractive or general fractional …

Stabilization of broad-area semiconductor laser sources by simultaneous index and pump modulations

WW Ahmed, S Kumar, J Medina, M Botey, R Herrero… - Optics letters, 2018 - opg.optica.org
We show that the emission of broad-area semiconductor amplifiers and lasers can be
efficiently stabilized by introducing two-dimensional periodic modulations simultaneously on …

Directionality fields generated by a local Hilbert transform

WW Ahmed, R Herrero, M Botey, Z Hayran, H Kurt… - Physical Review A, 2018 - APS
We propose an approach based on a local Hilbert transform to design non-Hermitian
potentials generating arbitrary vector fields of directionality, p ⃗ (r ⃗), with desired shapes …

Stabilized narrow-beam emission from broad-area semiconductor lasers

J Medina Pardell, R Herrero, M Botey, K Staliunas - Physical Review A, 2020 - APS
We provide a feasible and compact scheme to control and stabilize the spatiotemporal
dynamics of broad-area semiconductor (BAS) lasers. The proposal is based on the ability of …

[HTML][HTML] Enhanced acoustic pressure sensors based on coherent perfect absorber-laser effect

M Farhat, WW Ahmad, A Khelif, KN Salama… - Journal of Applied …, 2021 - pubs.aip.org
Lasing is a well-established field in optics with several applications. Yet, having lasing or
huge amplification in other wave systems remains an elusive goal. Here, we utilize the …

Regularization of vertical-cavity surface-emitting laser emission by periodic non-Hermitian potentials

WW Ahmed, R Herrero, M Botey, Y Wu, K Staliunas - Optics letters, 2019 - opg.optica.org
We propose a novel physical mechanism based on periodic non-Hermitian potentials to
efficiently control the complex spatial dynamics of broad-area lasers, particularly in vertical …