120 citations · 466 across the 23 of their papers we have counts for
24 papers
Novel Single Clad Ho-doped Fiber with High Slope Efficiency and Low Ion Pairing
Robert E. Tench, Wiktor Walasik, Alexandre Amavigan +3
We report the design and experimental and simulated performance for a 2050 nm band fiber amplifier with high optical-optical slope efficiency and low ion pairing, using a novel hig…
2 m Watt-level Fiber Amplifiers, Lasers, and ASE Sources Pumped by Broadband ASE Pumps
Robert E. Tench, Jean-Marc Delavaux, Wiktor Walasik +2
We report the design and demonstration of novel 2 m band Watt-level fiber amplifiers, fiber lasers, and wideband ASE sources that are pumped with broad spectrum Watt-level ASE s…
Supersymmetric microring laser arrays
Bikashkali Midya, Han Zhao, Xingdu Qiao +5
Coherent combination of emission power from an array of coupled semiconductor lasers operating on the same chip is of fundamental and technological importance. In general, the nonl…
Optically tunable topological photonic crystal
Mikhail I. Shalaev, Wiktor Walasik, Natalia M. Litchinitser
Topological photonic insulators pave the way toward efficient integrated photonic devices with minimized scattering losses. Optical properties of the majority of topological struct…
Continuous supersymmetric transformation for photonic design
Wiktor Walasik, Nitish Chandra, Bikashkali Midya +2
We propose to use a continuous supersymmetric (SUSY) transformation of a dielectric permittivity profile in order to design a photonic mode sorter. The iso-spectrality of the SUSY…
Supercharge optical arrays
Bikashkali Midya, Wiktor Walasik, Natalia M. Litchinitser +1
We introduce the notion of a supercharge optical array synthesized according to supersymmetric charge operators. Starting from an arbitrary array, mathematical supersymmetry transf…
Supersymmetry-guided method for mode selection and optimization in coupled systems
Wiktor Walasik, Bikashkali Midya, Liang Feng +1
Single-mode operation of coupled systems such as optical-fiber bundles, lattices of photonic waveguides, or laser arrays requires an efficient method to suppress unwanted super-mod…
Reconfiguring structured light beams using nonlinear metasurfaces
Yun Xu, Jingbo Sun, Jesse Frantz +8
Ultra-compact, low-loss, fast, and reconfigurable optical components, enabling manipulation of light by light, could open numerous opportunities for controlling light on the nanosc…
Experimental demonstration of valley-Hall topological photonic crystal at telecommunication wavelengths
Mikhail I. Shalaev, Wiktor Walasik, Alexander Tsukernik +2
Photonic topological insulators provide unprecedented possibilities to eliminate scattering losses and improve the efficiency of optical communication systems. Despite significant…
Orbital angular momentum beam instabilities in engineered nonlinear colloidal media
Jingbo Sun, Salih Z. Silahli, Wiktor Walasik +3
In this letter, we experimentally demonstrate the evolution of the optical vortex beams of different topological charges propagating in engineered nano-colloidal suspension of nega…
Reconfigurable Topological Photonic Crystal
Mikhail I. Shalaev, Sameerah Desnavi, Wiktor Walasik +1
Topological insulators are materials that conduct on the surface and insulate in their interior due to non-trivial topological order. The edge states on the interface between topol…
Trajectories and orbital angular momentum of necklace beams in nonlinear colloidal suspensions
Wiktor Walasik, Salih Z. Silahli, Natalia M. Litchinitser
Recently, we have predicted that the modulation instability of optical vortex solitons propagating in nonlinear colloidal suspensions with exponential saturable nonlinearity leads…
Free-Space Nonlinear Beam Combining Towards Filamentation
Shermineh Rostami, Wiktor Walasik, Daniel Kepler +3
Multi-filamentation opens new degrees of freedom for manipulating electromagnetic waves in air. However, without control, multiple filament interactions, including attraction, repu…
Modulation instability of structured-light beams in negative-index metamaterials
Salih Z. Silahli, Wiktor Walasik, Natalia M. Litchinitser
One of the most fundamental properties of isotropic negative-index metamaterials, namely opposite directionality of the Poynting vector and the wavevector, enable many novel linear…
Meta- Symmetry in Asymmetric Directional Couplers
Chicheng Ma, Wiktor Walasik, Natalia M. Litchinitser
Despite the benefits that directional coupler based parity-time symmetric systems may offer to the field of integrated optics, the realization of such couplers relies on rather str…
Dynamics of large femtosecond filament arrays: possibilities, limitations, and trade-offs
Wiktor Walasik, Natalia M. Litchinitser
Stable propagation of large, multifilament arrays over long distances in air paves new ways for microwave-radiation manipulation. Although, the dynamics of a single or a few filame…
Necklace Beam Generation in Nonlinear Colloidal Engineered Media
Salih Z. Silahli, Wiktor Walasik, Natalia M. Litchinitser
Modulational instability is a phenomenon that reveals itself as the exponential growth of weak perturbations in the presence of an intense pump beam propagating in a nonlinear medi…
Nonlinear parity-time-symmetric transition in finite-size optical couplers
Wiktor Walasik, Chicheng Ma, Natalia M. Litchinitser
Parity-time-symmetric (-symmetric) optical waveguide couplers offer a great potential for future applications in integrated optics. Studies of nonlinear $\mathcal{PT}…
Phase transition in multimode nonlinear parity-time-symmetric waveguide couplers
Wiktor Walasik, Natalia M. Litchinitser
Parity-time-symmetric (-symmetric) optical waveguide couplers have become a key component for integrated optics. They offer new possibilities for fast, ultracompact,…
Plasmon-soliton waves in planar slot waveguides: II. Results for stationary waves and stability analysis
Wiktor Walasik, Gilles Renversez, Fangwei Ye
We describe the results of the two methods we developed to calculate the stationary nonlinear solutions in one-dimensional plasmonic slot waveguides made of a finite-thickness nonl…
Plasmon-soliton waves in planar slot waveguides: I. Modeling
Wiktor Walasik, Gilles Renversez
We present two complementary models to study stationary nonlinear solutions in one-dimensional plasmonic slot waveguides made of a finite-thickness nonlinear dielectric core surrou…
Symmetric metal slot waveguides with nonlinear dielectric core: bifurcations, size effects, and higher order modes
Wiktor Walasik, Alejandro Rodriguez, Gilles Renversez
We study the nonlinear waves propagating in metal slot waveguides with a Kerr-type dielectric core. We develop two independent semi-analytical models to describe the properties of…
Liquid crystal hyperbolic metamaterial for wide-angle negative-positive refraction and reflection
G. Pawlik, K. Tarnowski, W. Walasik +2
We show that nanosphere dispersed liquid crystal (NDLC) metamaterial can be characterized in near IR spectral region as an indefinite medium whose real parts of effective ordinary…
Stationary plasmon-soliton waves in metal-dielectric nonlinear planar structures: modeling and properties
Wiktor Walasik, Gilles Renversez, Yaroslav Kartashov
We present three complementary methods to study stationary nonlinear solutions in one-dimensional nonlinear metal-dielectric structures. Two of them use an approximate treatment of…