A5066912014- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Photonic Crystals and Applications
- Photonic Crystal and Fiber Optics
- Metamaterials and Metasurfaces Applications
- Optical Network Technologies
- Advanced Fiber Optic Sensors
- Near-Field Optical Microscopy
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Orbital Angular Momentum in Optics
- Optical and Acousto-Optic Technologies
- ZnO doping and properties
- Microwave Dielectric Ceramics Synthesis
- Transition Metal Oxide Nanomaterials
- Neural dynamics and brain function
- Photoreceptor and optogenetics research
- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Education and Cultural Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Copper-based nanomaterials and applications
University of Warsaw
2015-2024
London Centre for Nanotechnology
2022
King's College London
2016-2022
Institute of Geophysics
2022
Institute of Electronic Materials Technology
2017-2019
University of Warmia and Mazury in Olsztyn
2011
The field of spinoptronics is underpinned by good control over photonic spin-orbit coupling in devices that have strong optical nonlinearities. Such might hold the key to a new era optoelectronics where momentum and polarization degrees freedom light are interwoven interfaced with electronics. However, manipulating photons through electrical means daunting task given their charge neutrality. In this work, we present electrically tunable microcavity exciton-polariton resonances...
Probing nanooptical near-fields is a major challenge in plasmonics. Here, we demonstrate an experimental method utilizing ultrafast photoemission from plasmonic nanostructures that capable of probing the maximum nanoplasmonic field enhancement any metallic surface environment. Directly measured values for various samples are good agreement with detailed finite-difference time-domain simulations. These results establish photoelectrons as versatile probes near-fields.
Tungsten trioxide (WO3) is one of a few stable semiconductor materials liable to produce solar fuel by photoelectrochemical water splitting. To enhance its visible light conversion efficiency, we incorporated plasmonic gold nanoparticles (Au NPs) derivatized with polyoxometalate (H3PMo12O40) species into WO3. The combined and catalytic effect Au NPs anchored the WO3 surface resulted in large increase photooxidation currents. Shielding polyoxometalates appears be an effective means avoid...
The ability to shape the index profile of optical fibers holds key fully flexible engineering their properties and future applications. We present a new approach for development graded fused silica fiber based on core nanostructurization. A is obtained by means distribution two types subwavelength glass rods. proposed method allows obtain arbitrary not limited circular or any other symmetry, such as in standard fibers. have developed proof concept with parabolic refractive showed perfect...
Abstract While free electrons in metals respond to ultrafast excitation with refractive index changes on femtosecond time scales, typical relaxation mechanisms occur over several picoseconds, governed by electron-phonon energy exchange rates. Here, we propose tailoring these intrinsic rates engineering a non-uniform electron temperature distribution through nanostructuring, thus, introducing an additional channel. We experimentally demonstrate sub-300 fs switching due the wavelength...
The future of plasmonic devices depends on effective reduction losses surface plasmon-polariton waves propagating along metal–dielectric interfaces. Energy dissipation is caused by resistive heating at the skin-deep-thick outer layer metal and scattering rough Fabrication noble nanolayers with a smooth still remains challenge. In this paper, Ag layers 10, 30, 50 nm thickness deposited directly fused-silica substrates 1 wetting Ge, Ti, Ni are examined using an atomic-force microscope...
We present a new approach for the development of structured optical fibers. It is shown that fibers having an effective gradient index profile with designed refractive distribution can be developed internal nanostructuring core composed two glasses. As proof-of-concept, made soft glasses parabolic are developed. Energy-dispersive X-ray spectroscopy reveals possibility selective diffusion individual chemical ingredients among sub-wavelength components nanostructure. This hints postulate also...
High refractive index (4.4 at 1100 nm), negligibly small absorption in near-infrared spectral range, and ease of processing make MoSe$_2$ a perfect material for applications photonics. So far, implementation MoSe$_2$-based photonic structures has been hindered by the lack large surface substrates. The use molecular beam epitaxy allows production homogeneous layers with few-inch thickness controlled sub-nm level. In present work, we design theoretical calculations fabricate simple lithography...
Reduction of surface plasmon-polariton losses due to their scattering on metal roughness still remains a challenge in the fabrication plasmonic devices for nanooptics. To achieve smooth silver films, we study dependence evaporation temperature physical vapor deposition process. At range 90 500 K, mismatch thermal expansion coefficients Ag, Ge wetting layer, and sapphire substrate does not deteriorate surface. avoid ice crystal formation substrates, working whole process should exceed that...
We present a numerical study of the dispersion characteristic modification nonlinear photonic crystal fibers infiltrated with liquids. A fiber based on soft glass PBG-08, 17 different organic solvents, is proposed. The has light transmission window in visible-mid-IR range 0.4-5 μm and higher refractive index than fused silica, which provides high contrast between structure air holes designed then developed stack-and-draw process. Analyzing SEM images real fiber, we calculate numerically...
Ultrashort optical pulses are integral to probing various physical, chemical, and biological phenomena feature in a whole host of applications, not least data communications. Super- subluminal pulse propagation dispersion management (DM) two the greatest challenges producing or counteracting modifications ultrashort when precise control over characteristics is required. Progress modern photonics toward integrated solutions applications has intensified this need for greater ultrafast...
We demonstrate numerically the diffraction-free propagation of sub-wavelength sized optical beams through simple elements built metal-dielectric multilayers. The proposed metamaterial consists silver and a high refractive index dielectric, is designed using effective medium theory as strongly anisotropic impedance matched to air. Further it characterised with transfer matrix method, investigated FDTD. behaviour verified by analysis FWHM PSF in function number periods. Small reflections,...
We have investigated the influence of Ge wetting layer on both ohmic and scattering losses a surface plasmon-polariton (SPP) wave in Ag film deposited SiO2 substrate with an e-beam evaporator. Samples were examined by means atomic force microscopy (AFM), spectroscopic ellipsometry (SE), two-dimensional X-ray diffraction (XRD), photoelectron spectroscopy (XPS), microscopic four-point probe (M4PP) sheet resistance measurements. films 100 nm thickness at 180 295 K directly onto substrates or...
Imaging with a layered superlens is spatial filtering operation characterized by the point spread function (PSF). We show that in same optical system image of narrow subwavelength Gaussian incident field may be surprisingly dissimilar to PSF, and width PSF not straightforward measure resolution. The FWHM or standard deviation gives ambiguous information about actual resolution, imaging objects smaller than possible. A multiscale analysis good insight into peculiar scale-dependent properties imaging.
The coupling of propagating surface plasmon waves and localized oscillations in nanostructures is an essential phenomenon determining electromagnetic field enhancement on the nanoscale. Here, we use our recently developed ultrafast photoemission near-field probing technique to investigate fundamental question plasmon-plasmon its effect large factors. By measuring analyzing values at different nanostructured surfaces, can separate contributions from plasmons. When resonance conditions are...
Abstract We characterize the sensitivity of imaging properties a layered silver-TiO2 flat lens to fabrication inaccuracies. The is designed for approximately diffraction-free with subwavelength resolution at distances in order wavelength. Its operation may be attributed self-collimation secondary role Fabry-Perot resonant transmission, even though first effective medium description structure inaccurate. Super-resolution maintained broad range overall thicknesses and total thickness...
Abstract Plasmonic metamaterials and metasurfaces are important for many linear nonlinear photonic applications. Here, the possibility to control a nanostructured layer spontaneously formed near an interface of thin silver film is shown, where interplay between grain boundary structure surface segregation germanium atoms leads encapsulation grains and, as result, formation composite metamaterial surface. This Ag/Ge exhibits strong localized plasmon resonances at Ge‐encapsulated grains,...
We report a new fiber concept, which is hybrid design between classical step-index and photonic crystal fibers (PFCs). The proposed structure has centrally located Ge doped core surrounded by set of smaller microinclusions distributed in the cladding. In numerical investigations, we demonstrate that such combination allows to arbitrarily shape dispersion profile 1 μm wide spectral range while reducing confinement losses with respect air-hole PCFs exhibiting similar characteristics. present...
Manufacturing process of wire-like binary or ternary metal nanoalloys applying the magnetic-field-induced (MFI) synthesis is still a challenging task. Hence, this work demonstrates for first time how to produce iron-nickel nanostructures with Fe0·75Ni0.25, Fe0·5Ni0.5 and Fe0·25Ni0.75 compositions. In contrary previously reported Fe–Ni nanomaterials, has been carried out at room temperature without employment templates, surfactants, organic solvents, other chemical additives. The as-prepared...
Nanostructured GRIN components are optical elements which can have an arbitrary refractive index profile while retaining flat-parallel entry and exit facets. A method of their fabrication requires assembly large quantities glass rods in order to satisfy subwavelength requirement the effective medium theory. In this paper, we present a development gradient microlenses using combination methods: nanostructurization preform controlled diffusion process during lens drawing on fiber tower. Adding...
Recent discoveries have revealed that indium tin oxide (ITO), due to the presence of an epsilon-near-zero (ENZ) point and suitable carrier concentration mobility, can be used modulate refractive index, confine fields in nanoscale, enhance nonlinear effects, achieve ultrafast light switching or construct so-called time-varying media. While this potential positions ITO as a key material for future nanophotonic devices, producing films with precisely engineered properties remains significant...
In this paper we report on limits related to the development of optical fibers with glass subwavelength inclusions incorporated into core. We present fabrication a photonic crystal fiber made an in-house developed silicate NC21 subwavelength-size high refractive index inclusion in core lead SF6 glass. The has diameter 2 µm, while varies from 0 800 nm. Using energy-dispersive X-ray spectroscopy technique show dramatic change profile and its composition caused by non-uniform diffusion chemical...