Stability through symmetry A common route to get more light out of a laser system is couple multiple lasers form an array. However, instabilities owing cross-talk and interference between different modes individual cavities generally detrimental performance could ultimately be damaging the cavities. Hokmabadi et al. applied notions derived from supersymmetry, theory developed in high-energy physics describe make-up properties particles, design stable array semiconductor (see Perspective by...

We theoretically demonstrate that a type-II class of tilted Dirac cones can emerge in generalized two-dimensional anisotropic lattice arrangements. This is achieved by introducing special set graphynelike exchange bonds means which the complete spectrum underlying Weyl Hamiltonian be realized. Our ab initio calculations unique eigensolutions corresponding to fermionic excitations. Based on our approach, one systematically synthesize wide range strongly band diagrams having with variable...

Tilted-pulse-front pulses, which are produced via dispersive devices that introduce angular dispersion, useful in many areas of nonlinear optics. Such pulses typically have large transverse cross sections and propagate for limited distances to offset the impact diffractive space-time coupling leads spectral walk-off. Here we show sculpting spatiotemporal profile a pulsed plane wave enables synthesis propagation-invariant packets endowed with tilted intensity pulse front respect propagation...

Abstract The exceptional properties exhibited by two-dimensional materials, such as graphene, are rooted in the underlying physics of relativistic Dirac equation that describes low energy excitations molecular systems. In this study, we explore a periodic lattice provides access to full solution spectrum extended Hamiltonian. Employing its photonic implementation evanescently coupled waveguides, indicate ability independently perturb symmetries discrete model (breaking, also, barrier towards...

The synthesis of ultrathin photonic structures in order to effectively redirect and mold optical wave fronts into arbitrary shapes is crucial importance modern beam steering, imaging, sensing technologies. To this end, planar subwavelength systems such as metasurfaces have been intensely investigated recent years. Such arrangements rely on abrupt, yet controllable, phase shifts imparted the incident beam, by means judiciously designed anisotropic nanoantennas. Here, we propose demonstrate an...

Top-down fabrication is commonly used to provide positioning control of optical structures; yet, it places stringent limitations on component materials, and oftentimes, dynamic reconfigurability challenging realize. Here, we present a reconfigurable nanoparticle platform that can integrate heterogeneous particle assembly different shapes, sizes, chemical compositions. We demonstrate disorder in this use tune random laser emission characteristics for suspension titanium dioxide nanowires dye...

In the absence of suitable deposition processes, fabrication graded-index chalcogenide waveguides or fibers remains an outstanding challenge. Here, by exploiting strong thermo-optic effect present in glasses, we experimentally demonstrate non-permanent optically-induced bulk As2Se3 rods using a 1.55 μm wavelength laser. This single-step process can be used not only to self-trap writing beam, but also guide another optical beam at different opto-thermally inscribed waveguide channel. These...

The theoretical framework of supersymmetry (SUSY) aims to relate bosons and fermions-two profoundly different species particles-and their interactions.While this space-time symmetry is seen provide an elegant solution many unanswered questions in high-energy physics, its experimental verification has so far remained elusive.Here, we demonstrate that, notions from can be strategically utilized optics order address one the longstanding challenges laser science.In regard, a supersymmetric array...

In this paper, we formally prove how, by cyclically varying the parameters of a generalized two-level discrete and non-Hermitian Hamiltonian, respective state vector converts to instantaneous eigenstate system in adiabatic limit, irrespective how was initially prepared or form cyclic trajectory followed within parameter space $(\mathsc{R})$ whether singularity/exceptional point is encircled not. Our proof also applies continuous configurations limit infinitesimally small time steps. The...

In the present paper, we aim to firmly establish adiabatic properties of two-level non-Hermitian quantum structures evolving along generalized (open/acyclic or closed/cyclic) paths in parameter space. Analytical solutions terms Airy and modified Bessel functions have been retrieved for linear hyperbolic temporal dependencies parity-time-symmetric-like systems, which were subsequently studied slowly varying limit show conversion one instantaneous eigenstates. Such a mode switching behavior is...

In this paper we show how to systematically design anti-reflective metasurfaces for the mid-infrared wavelength range. To do so, have utilized a multilayer arrangement involving judiciously nano-perforated surface, having air holes, arranged in hexagonal fashion. By exploiting an effective medium approach, optimized dimensions of surface features our design. Here, report broadband reflectivity 3.5 − 5.5 μm that is below 10% over broad range incident angles 0⁰ ≤...

We find exact solutions describing bidirectional pulses propagating in fiber Bragg gratings. They are derived by solving the coupled-mode theory equations and expressed terms of products modified Bessel functions with algebraic functions. Depending on values two free parameters, general $X$-wave solution can also take form a unidirectional pulse. analyze symmetries asymptotic properties discuss additional waveforms that obtained interference more than one solution. their such create sharp...

We show that passive parity-time (PT) symmetric metasurfaces can be utilized to appropriately engineer the resulting far-field characteristics. Such PT-symmetric structures are capable of eliminating diffraction orders in specific directions, while maintaining or even enhancing remaining orders. A systematic methodology is developed implement this class both one-dimensional and two-dimensional geometries. In systems, PT symmetry established by employing either H-like diffractive elements...

We explore light diffraction by parity-time-symmetric metasurfaces. Such structures can lead to one-sided when operating close their exceptional points. In this regime, the negative orders are eliminated while positive enhanced.

We present a new strategy for regulating light emission dynamics in high power laser arrays. Our approach is based on engineering the properties of non-Hermitian supersymmetric optical arrays and offers several advantages over previous investigations.

Parity-time (PT) symmetric complex structures can exhibit peculiar properties which are otherwise unattainable in traditional Hermitian systems. This is achieved by judiciously involving balanced regions of gain and loss. Here we investigate the scattering PT-symmetric diffraction gratings. The presence imaginary potential modify light transport their far field. an outcome a local power flow taking place between loss near We show that for certain gain/loss contrast, all negative orders be...

A systematic method for the efficient design of narrowband filters founded on extraordinary transmission via single fishnet structures (SFSs) is presented in this paper.Essentially, due to its strong resonant behavior, phenomenon proven suitable implementation high-Q devices.The new formulas are derived through combination full-wave numerical simulations and curve fitting algorithms.Also, adequate mathematical criteria defined evaluation filters' linear performance, indicating that...

Conventional waveguide-writing techniques in bulk chalcogenides rely on permanent photo-structural changes, which lead to ridge-like guiding channels. Here, we demonstrate non-permanent opto-thermally induced graded-index waveguides As2Se3 glass.

We report on a novel nanoparticle platform by electric field assisted assembly, which is capable of manipulating the refractive index distribution through controlling particle assembly. Two examples based control scattering properties are presented. demonstrate lensless imaging in such system. In addition, we show that random lasing can be enhanced assembly anisotropic particles immersed gain medium. These illustrate technique provides promising for reconfigurable optical applications.

Supersymmetric transformations aim to relate boson and fermions, two different species of particles, their interactions. In quantum mechanics, the mathematical framework SUSY can be used design isospectral potentials. By virtue isomorphism between Schrodinger wave equations, one use such for designing novel optical systems. this talk, we review recent developments in general area supersymmetric optics photonics. We will also discuss possibility generating high brightness coherent light laser arrays.