Wiktor Walasik
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View article: 2 $μ$m Watt-level Fiber Amplifiers, Lasers, and ASE Sources Pumped by Broadband ASE Pumps
2 $μ$m Watt-level Fiber Amplifiers, Lasers, and ASE Sources Pumped by Broadband ASE Pumps Open
We report the design and demonstration of novel 2 $μ$m band Watt-level fiber amplifiers, fiber lasers, and wideband ASE sources that are pumped with broad spectrum Watt-level ASE sources instead of conventional fiber laser pumps. We show g…
View article: Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers
Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers Open
We report the design and performance of medium slope efficiency (64%) Holmium-doped fiber amplifiers (HDFAs) with novel alternative in-band pump wavelengths in the 1720–2000 nm spectral region. We demonstrate through simulations that pump …
View article: Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers
Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers Open
We report the design and performance of medium slope efficiency (64%) Holmium-doped fiber amplifiers (HDFAs) with novel alternative in-band pump wavelengths in the 1720–2000 nm spectral region. We demonstrate through simulations that pump …
View article: Filament conductivity enhancement through nonlinear beam interaction
Filament conductivity enhancement through nonlinear beam interaction Open
Laser filament applications relying on filament plasma conductivity are limited by their low electron densities and corresponding short lifetimes. Filament plasma formation, an intensity-dependent process, is limited by the clamping of the…
View article: Enhanced energy localization in electromagnetically thick metallic mesoshells
Enhanced energy localization in electromagnetically thick metallic mesoshells Open
While subwavelength dielectric structures enclosed by a thin metallic nanoshell have found a wide range of applications, their wavelength-scale counterparts have not been addressed. Conventionally, a dielectric enclosed by a thick metallic…
View article: Mode-sorter design using continuous supersymmetric transformation
Mode-sorter design using continuous supersymmetric transformation Open
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 transformation ensures that modes of the waveguide preserve…
View article: Optically tunable topological photonic crystal
Optically tunable topological photonic crystal Open
Topological photonic insulators can enable the development of efficient integrated photonic devices with minimized scattering losses. The optical properties of the majority of topological structures proposed to date are fixed by designs su…
View article: Nonlinear Metasurface for Structured Light with Tunable Orbital Angular Momentum
Nonlinear Metasurface for Structured Light with Tunable Orbital Angular Momentum Open
Orbital angular momentum (OAM) beams may create a new paradigm for the future classical and quantum communication systems. A majority of existing OAM beam converters are bulky, slow, and cannot withstand high powers. Here, we design and ex…
View article: Supersymmetric microring laser arrays
Supersymmetric microring laser arrays Open
Coherent combination of emission power from an array of coupled semiconductor\nlasers operating on the same chip is of fundamental and technological\nimportance. In general, the nonlinear competition among the array supermodes\ncan entail …
View article: Optically tunable topological photonic crystal
Optically tunable topological photonic crystal Open
Topological photonic insulators pave the way toward efficient integrated photonic devices with minimized scattering losses. Optical properties of the majority of topological structures proposed to date are fixed by design such that no chan…
View article: Continuous supersymmetric transformation for photonic design
Continuous supersymmetric transformation for photonic design Open
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 transformation ensures that modes of the waveguide preserve…
View article: Reconfiguring structured light beams using nonlinear metasurfaces
Reconfiguring structured light beams using nonlinear metasurfaces Open
Ultra-compact, low-loss, fast, and reconfigurable optical components, enabling manipulation of light by light, could open numerous opportunities for controlling light on the nanoscale. Nanostructured all-dielectric metasurfaces have been s…
View article: Reconfigurable topological photonic crystal
Reconfigurable topological photonic crystal Open
Topological insulators are materials that conduct on the surface and insulate\nin their interior due to non-trivial topological order. The edge states on the\ninterface between topological (non-trivial) and conventional (trivial)\ninsulato…
View article: Experimental demonstration of valley-Hall topological photonic crystal at telecommunication wavelengths
Experimental demonstration of valley-Hall topological photonic crystal at telecommunication wavelengths Open
Photonic topological insulators provide unprecedented possibilities to eliminate scattering losses and improve the efficiency of optical communication systems. Despite significant theoretical efforts, the experimental demonstration of an i…
View article: Experimental demonstration of valley-Hall topological photonic crystal\n at telecommunication wavelengths
Experimental demonstration of valley-Hall topological photonic crystal\n at telecommunication wavelengths Open
Photonic topological insulators provide unprecedented possibilities to eliminate scattering losses and improve the efficiency of optical communication systems. Despite significant theoretical efforts, the experimental demonstration of an i…
View article: Dynamics of necklace beams in nonlinear colloidal suspensions
Dynamics of necklace beams in nonlinear colloidal suspensions Open
Recently, we have predicted that the modulation instability of optical vortex solitons propagating in nonlinear colloidal suspensions with exponential saturable nonlinearity leads to formation of necklace beams (NBs). Here, we investigate …
View article: Free-Space Nonlinear Beam Combining for High Intensity Projection
Free-Space Nonlinear Beam Combining for High Intensity Projection Open
The controlled interaction of two high intensity beams opens new degrees of freedom for manipulating electromagnetic waves in air. The growing number of applications for laser filaments requires fine control of their formation and propagat…
View article: Dissimilar directional couplers showing ${\mathscr{P}}{\mathscr{T}}$-symmetric-like behavior
Dissimilar directional couplers showing ${\mathscr{P}}{\mathscr{T}}$-symmetric-like behavior Open
Despite the benefits which the directional couplers based on parity-time symmetric systems may offer to the field of integrated optics, the realization of such couplers relies on rather strict design constraints on the waveguide parameters…
View article: Trajectories and orbital angular momentum of necklace beams in nonlinear\n colloidal suspensions
Trajectories and orbital angular momentum of necklace beams in nonlinear\n colloidal suspensions Open
Recently, we have predicted that the modulation instability of optical vortex\nsolitons propagating in nonlinear colloidal suspensions with exponential\nsaturable nonlinearity leads to formation of necklace beams (NBs)\n[S.~Z.~Silahli, W.~…
View article: Trajectories and orbital angular momentum of necklace beams in nonlinear colloidal suspensions
Trajectories and orbital angular momentum of necklace beams in nonlinear colloidal suspensions Open
Recently, we have predicted that the modulation instability of optical vortex solitons propagating in nonlinear colloidal suspensions with exponential saturable nonlinearity leads to formation of necklace beams (NBs) [S.~Z.~Silahli, W.~Wal…
View article: Probing metamaterials with structured light
Probing metamaterials with structured light Open
Photonic metamaterials and metasurfaces are nanostructured optical materials engineered to enable properties that have not been found in nature. Optical characterization of these structures is a challenging task. We report a reliable techn…
View article: Free-Space Nonlinear Beam Combining Towards Filamentation
Free-Space Nonlinear Beam Combining Towards Filamentation Open
Multi-filamentation opens new degrees of freedom for manipulating electromagnetic waves in air. However, without control, multiple filament interactions, including attraction, repulsion or fusion often result in formation of complex disord…
View article: Orbital angular momentum microlaser
Orbital angular momentum microlaser Open
Microlasers with a twist Structured light, in the form of helical wavefronts, provides an additional degree of freedom to encode information for optical communications. Creating light beams with the desired amount of optical angular moment…
View article: Dynamics of Large Femtosecond Filament Arrays: Possibilities, Limitations, and Trade-Offs
Dynamics of Large Femtosecond Filament Arrays: Possibilities, Limitations, and Trade-Offs Open
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 filaments was discussed in some of the previous studies, we show …
View article: Plasmon-soliton waves in planar slot waveguides. II. Results for stationary waves and stability analysis
Plasmon-soliton waves in planar slot waveguides. II. Results for stationary waves and stability analysis Open
We describe the results of the two methods we developed to calculate the\nstationary nonlinear solutions in one-dimensional plasmonic slot waveguides\nmade of a finite-thickness nonlinear dielectric core surrounded by metal\nregions. These…