Wiktor Piecek
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View article: Directional Lasing from a 3D Blue Phase Photonic Crystal
Directional Lasing from a 3D Blue Phase Photonic Crystal Open
Photonic crystals manipulate light propagation via periodic structures, enabling control over optical phenomena across specific frequency ranges. Among these, liquid crystals (LC) with chiral molecules produce twisted, periodic structures …
View article: <i>In situ</i> tunneling control in photonic potentials by Rashba–Dresselhaus spin–orbit coupling
<i>In situ</i> tunneling control in photonic potentials by Rashba–Dresselhaus spin–orbit coupling Open
The control over individual tunneling amplitudes in photonic lattices is highly desirable for photonic Hamiltonian engineering. In this work, we demonstrate the in situ control of tunneling between individual sites patterned inside an opti…
View article: Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity
Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity Open
Small-footprint, low-power arrays of coupled coherent emitters with the capability of near- and far-field engineering and coherence control are highly sought after to meet modern nanophotonics evolving needs. Between existing solutions bas…
View article: Electrically Tunable Momentum Space Polarization Singularities in Liquid Crystal Microcavities
Electrically Tunable Momentum Space Polarization Singularities in Liquid Crystal Microcavities Open
Momentum space polarization singularities of light appear as vectorial twists in the scattered and radiated far field patterns of exotic photonic structures. They relate to important concepts such as bound states in the continuum, spatiote…
View article: Electrically tunable momentum space polarization singularities in liquid crystal microcavities
Electrically tunable momentum space polarization singularities in liquid crystal microcavities Open
Momentum space polarization singularities of light appear as vectorial twists in the scattered and radiated far field patterns of exotic photonic structures. They relate to important concepts such as bound states in the continuum, spatiote…
View article: Optically trapped exciton-polariton condensates in a perovskite microcavity
Optically trapped exciton-polariton condensates in a perovskite microcavity Open
We demonstrate room temperature optical trapping and generation of high-order angular harmonics in exciton-polariton condensates in a monocrystalline CsPbBr$_3$ perovskite-filled microcavity. Using an annular nonresonant excitation profile…
View article: Electrically Tunable Spin‐Orbit Coupled Photonic Lattice in a Liquid Crystal Microcavity
Electrically Tunable Spin‐Orbit Coupled Photonic Lattice in a Liquid Crystal Microcavity Open
A 1D photonic crystal is created with strong polarization dependence and tunable by an applied electric field. This is accomplished in a planar microcavity by embedding a cholesteric liquid crystal (LC), which spontaneously forms a uniform…
View article: Free‐Standing Ultrathin Films of 2D Perovskite for Light‐Emitting Devices Operating at Strong Coupling Regime
Free‐Standing Ultrathin Films of 2D Perovskite for Light‐Emitting Devices Operating at Strong Coupling Regime Open
A novel and cost‐effective method for producing free‐standing polyimide films that support a layer of 2D polycrystalline perovskite is presented. This flexible structure can be easily transferred to different substrates of various sizes an…
View article: In-situ tunneling control in photonic potentials by Rashba-Dresselhaus spin-orbit coupling
In-situ tunneling control in photonic potentials by Rashba-Dresselhaus spin-orbit coupling Open
The tunability of individual coupling amplitudes in photonic lattices is highly desirable for photonic Hamiltonian engineering and for studying topological transitions in situ. In this work, we demonstrate the tunneling control between ind…
View article: Electrically tunable spin-orbit coupled photonic lattice in a liquid crystal microcavity
Electrically tunable spin-orbit coupled photonic lattice in a liquid crystal microcavity Open
We create a one-dimensional photonic crystal with strong polarization dependence and tunable by an applied electric field. We accomplish this in a planar microcavity by embedding a cholesteric liquid crystal (LC), which spontaneously forms…
View article: On the Feasibility of an LCD-Based Real-Time Converter for Ionizing Radiation Imaging
On the Feasibility of an LCD-Based Real-Time Converter for Ionizing Radiation Imaging Open
Here we present the cascade converter (CC), which provides real-time imaging of ionizing radiation (IoR) distribution. It was designed and manufactured with the simplest architecture, utilizing liquid crystal display (LCD) technology. Base…
View article: Observation of a supersolid phase in a spin-orbit coupled exciton-polariton Bose-Einstein condensate at room temperature
Observation of a supersolid phase in a spin-orbit coupled exciton-polariton Bose-Einstein condensate at room temperature Open
In Bose-Einstein condensates (BEC), spin-orbit coupling (SOC) produces supersolidity. It is a peculiar state of matter, which, in addition to the superfluid behaviour shows periodic density modulation typical for crystals. Here, we report …
View article: Non-Hermitian polariton–photon coupling in a perovskite open microcavity
Non-Hermitian polariton–photon coupling in a perovskite open microcavity Open
Exploring the non-Hermitian properties of semiconductor materials for optical applications is at the forefront of photonic research. However, the selection of appropriate systems to implement such photonic devices remains a topic of debate…
View article: Electrical polarization switching of perovskite polariton laser
Electrical polarization switching of perovskite polariton laser Open
Optoelectronic and spinoptronic technologies benefit from flexible and tunable coherent light sources combining the best properties of nano- and material-engineering to achieve favorable properties such as chiral lasing and low threshold n…
View article: Influence of the molecular structure of compounds with terminal isothiocyanate group on the induction of the smectic A phase: Part II
Influence of the molecular structure of compounds with terminal isothiocyanate group on the induction of the smectic A phase: Part II Open
The influence of the structure of compounds having terminal isothiocyanate group in binary mixtures with compounds having terminal alkyl chains on the induction of the smectic A phase is shown. Compounds with a triple bond in the molecular…
View article: Universality of open microcavities for strong light-matter coupling
Universality of open microcavities for strong light-matter coupling Open
An optical resonator is utilized to enhance interactions between photons and solid-state emitters. In particular, when the coupling strength between the exciton within the material is faster than the dissipation rate, the eigenstates of th…
View article: Electrical switching of a chiral lasing from polariton condensate in a Rashba-Dresselhaus regime
Electrical switching of a chiral lasing from polariton condensate in a Rashba-Dresselhaus regime Open
Efficient optical classical and quantum information processing imposes on light novel requirements: chirality with low threshold non-linearities. In this work we demonstrate a chiral lasing from an optical modes due to emerging photonic Ra…
View article: Electrically tunable Berry curvature and strong light-matter coupling in liquid crystal microcavities with 2D perovskite
Electrically tunable Berry curvature and strong light-matter coupling in liquid crystal microcavities with 2D perovskite Open
The field of spinoptronics is underpinned by good control over photonic spin-orbit coupling in devices that have strong optical nonlinearities. Such devices might hold the key to a new era of optoelectronics where momentum and polarization…
View article: Annihilation of exceptional points from different Dirac valleys in a 2D photonic system
Annihilation of exceptional points from different Dirac valleys in a 2D photonic system Open
Topological physics relies on Hamiltonian’s eigenstate singularities carrying topological charges, such as Dirac points, and – in non-Hermitian systems – exceptional points (EPs), lines or surfaces. So far, the reported non-Hermitian topol…
View article: Flexoelectric Polarization in a Nematic Liquid Crystal Enhanced by Dopants with Different Molecular Shape Polarities
Flexoelectric Polarization in a Nematic Liquid Crystal Enhanced by Dopants with Different Molecular Shape Polarities Open
Flexoelectricity may have an important impact on the switching properties of nematic and cholesteric liquid crystals due to the linear coupling between the flexoelectric polarization of the liquid crystal and the applied electric field. Th…
View article: Electrically tunable Berry curvature and strong light-matter coupling in birefringent perovskite microcavities at room temperature
Electrically tunable Berry curvature and strong light-matter coupling in birefringent perovskite microcavities at room temperature Open
The field of spinoptronics is underpinned by good control over photonic spin-orbit coupling in devices that possess strong optical nonlinearities. Such devices might hold the key to a new era of optoelectronics where momentum and polarizat…
View article: Realizing Persistent-Spin-Helix Lasing in the Regime of Rashba-Dresselhaus Spin-Orbit Coupling in a Dye-Filled Liquid-Crystal Optical Microcavity
Realizing Persistent-Spin-Helix Lasing in the Regime of Rashba-Dresselhaus Spin-Orbit Coupling in a Dye-Filled Liquid-Crystal Optical Microcavity Open
In the presence of Rashba-Dresselhaus coupling, strong spin-orbit interactions in liquid-crystal optical cavities result in a distinctive spin-split entangled dispersion. Spin coherence between such modes gives rise to an optically persist…
View article: Fountain fringe field switching (FFFS) for wide viewing angle LCDs
Fountain fringe field switching (FFFS) for wide viewing angle LCDs Open
To reduce or completely remove the viewing angle dependence of liquid crystal (LC) displays and devices, we have recently introduced a new electrode structure for LC displays. This electrode structure has openings (holes) in the pixel elec…
View article: Lasing in the Rashba-Dresselhaus spin-orbit coupling regime in a\n dye-filled liquid crystal optical microcavity
Lasing in the Rashba-Dresselhaus spin-orbit coupling regime in a\n dye-filled liquid crystal optical microcavity Open
In the presence of Rashba-Dresselhaus coupling, strong spin-orbit interactions in liquid crystal optical cavities result in a distinctive spin-split entangled dispersion. Spin coherence between such modes give rise to an optical persistent…
View article: Lasing in the Rashba-Dresselhaus spin-orbit coupling regime in a dye-filled liquid crystal optical microcavity
Lasing in the Rashba-Dresselhaus spin-orbit coupling regime in a dye-filled liquid crystal optical microcavity Open
In the presence of Rashba-Dresselhaus coupling, strong spin-orbit interactions in liquid crystal optical cavities result in a distinctive spin-split entangled dispersion. Spin coherence between such modes give rise to an optical persistent…
View article: Old experiments in new light: Young's double-slit and Stern-Gerlach experiments in liquid crystal microcavities
Old experiments in new light: Young's double-slit and Stern-Gerlach experiments in liquid crystal microcavities Open
Spin-orbit interactions which couple spin of a particle with its momentum degrees of freedom lie at the center of spintronic applications. Of special interest in semiconductor physics are Rashba and Dresselhaus spin-orbit coupling (SOC). W…
View article: Observation of second-order meron polarization textures in optical microcavities
Observation of second-order meron polarization textures in optical microcavities Open
Multicomponent Bose–Einstein condensates, quantum Hall systems, and chiral magnetic materials display twists and knots in the continuous symmetries of their order parameters known as skyrmions. Originally discovered as solutions to the non…