Archives

  • Vol. 17 No. 1 (2025)

    This special issue, dedicated to the 21st Conference on Optical Fibers and Their Applications (OFTA 2025), taking place in Białystok, Poland, in January 2025, consists of 10 papers. Specifically, the paper on the fabrication and properties of Erbium-doped Gallo-Germanate glass thin films via RF-sputtering explores the potential of Er³⁺-doped thin films for integrated optics emission sources. Research on Europium-doped nanocomposite TiOx:SiOy layers demonstrates how Eu³⁺ ions reduce optical losses by affecting crystallization and surface roughness. Luminescent monitoring of Eu³⁺-doped 13-93 bioactive glass fiber degradation investigates the degradation rate using luminescence monitoring. The investigation of neural networks for temperature and relative humidity measurement with Rayleigh scattering-based distributed optical fiber sensors evaluates neural networks for processing sensor data. The effect of CO₂ laser-induced crystallization on ErF₃-doped tellurite-germanate oxy-fluoride glass examines structural and luminescent enhancements induced by CO₂ laser irradiation. Enhanced sensitivity of absorption spectroscopy glucose detection by machine learning shows the effectiveness of UV-VIS spectroscopy and machine learning in detecting low glucose concentrations in urine samples. Machine learning-enhanced optical fiber sensors for detection of low glucose concentration in samples mimicking tissue present an optical fiber sensor enhanced by machine learning for accurate detection of low glucose concentrations. Investigation of the luminescent properties of SiLiZn glass-ceramic phosphor doped Cr³⁺/Cr⁴⁺ explores the development of Cr²O₃-doped glass-ceramic phosphors for broadband NIR emission, targeting applications in NIR pc-LEDs. Broadband emission in the near-infrared range in glasses doped with PbS quantum dots and Er³⁺ ions showcases borosilicate glasses co-doped with PbS quantum dots and Er³⁺ ions for broadband NIR luminescence. Finally, the ratiometric optical laser power sensor based on a polymer luminescent nanocomposite presents a ratiometric optical laser power sensor using a polymer luminescent nanocomposite for inexpensive laser monitoring systems.

    In addition, two other papers are included in the issue. The paper on the near-infrared image-based method for vision enhancement in monitoring the structure and emission character of operating phosphor-converted white light-emitting diodes (pcW-LEDs) demonstrates how incorporating infrared filters significantly improves the observation of pcW-LEDs during operation, reducing glare and enhancing emission efficiency evaluation. The second paper, reconceiving impedance matching and mismatching to mitigate bias-drift in insertion loss of liquid crystal phase delay lines, proposes a novel hardware approach to address amplitude imbalance in phased array antenna feed systems, thereby reducing performance degradation and maintenance costs without relying on conventional amplifiers or attenuators.

  • Vol. 16 No. 4 (2024)

    The current, 64th Photonics Letters of Poland issue (Vol. 16 No. 4) contains 9 papers related with the research activities of the Photonics technologies – one of seven Priority Research Areas identified by Warsaw University of Technology within the “Excellence Initiative – Research University” Program and 1 regular paper.

    The idea behind the Excellence Initiative – Research University Program carried out in the years 2020-2025 was to select the best Polish universities and provide them with an opportunity to grow so that, in the future, they can be ranked among renowned universities all over the world. Priority Research Area Photonics technologies at Warsaw University of Technology has been focused on design and manufacturing of optical components and novel photonic materials as well on the development of innovative technologies and measurement methods in the following areas: fiber optic photonics, laser and terahertz technologies, photonic integrated circuits, optoelectronic devices and systems, photonic sensors and metrology, multispectral image processing.

    The diversity of the selected works reported in the current issue covers a significant spectrum of technology, photonic material, systems, and devices:

    Mazur et al. presented the first results of applying the phase-shifting method to recover phase information in a full-field swept-source Optical Coherence Tomography system operating in transmission mode.

    Budaszewski experimentally investigated birefringence of the ferroelectric liquid crystal doped with titanium dioxide nanoparticles.

    Fetliński et al. investigated feasibility of average photon energy parameter as a qualitative representation of solar spectra in modelling performance of photovoltaic modules equipped with a filter capable of reflecting parasitic IR irradiance.

    Cywińska et al. discussed the influence of the noise on the resultant local fringe orientation map estimated via DeepOrientation network.

    The paper by Orzechowski et al. discussed blue-phase liquid crystal composites with shelled gold nanoparticles.

    Dudek et al. presented the autofocusing method for lensless digital in-line holographic microscopy with misaligned illumination whereas Niedziela et al. described pixel super resolution with axial scanning in lensless digital in-line holographic microscopy.

    Sobczyk et al. presented THz based non-destructive testing system for security and inspection applications whereas Kałuża et al. discussed challenges and limitations of THz phase imaging method.

    Tomasz R. Woliński
    Priority Research Area Photonics technologies Chair

  • Vol. 16 No. 3 (2024)

    Different aspects of optics and photonics, like, fine-element adaptive meshing statistics of liquid crystal coaxial phase shifters at mmW and THz frequencies; numerical analyses to check how the core shape influences the quality of fiber sensors based on D-shape fibers; investigations of how the synthesis route of glass-ceramic doped with europium ions influences their optical and luminescence properties; implementation of convolutional neural networks in a virtual optical system for wavefront detection with potential application in visual optics; the role of standard and supplementary observers in accurate illuminance measurements; utilization of commonly available UVC diodes for deactivation of the SARS-CoV-2 virus.

  • Vol. 16 No. 2 (2024)

    In this issue, seven papers are presented, highlighting the advancements in optical and photonic technologies, demonstrating their potential in environmental monitoring, high-power applications, medical diagnostics, industrial metrology, and optical fiber sensors. Specifically, the critical points of the papers are: (i) investigations on input parameters of optical scattering, particle size and material, excitation laser, and refractive index of the medium, assisted by machine learning aimed particle characterization concerning microplastic pollution; (ii) development of a laser system dedicated to high-power applications and based on an in-house developed Yb3+ doped silica fiber with a large core, achieving a maximum output power of 107 W; (iii) design of a Photonic Crystal Fiber (PCF) sensor, leveraging guided-mode resonance and integrating a specific biomarker, for accurate and early-stage detection sensitive of tumor cells in cerebrospinal fluid; (iv) application of short wavelength infrared absorption spectroscopy for detecting methane and ammonia, addressing the current needs of industrial gas metrology; (v) proposal and verification of the method for modeling the emission of yellow phosphor YAG:Ce3+ based on the Gaussian function; (vi) a concept and numerical analysis of a fast scanner that combines a planar waveguide with a grating coupler and a swept source laser to be applied in PICs, (vii) a new method for fabricating fiber optic sensors based on D-shape fibers with an elliptical core. This innovative approach maintains a polarized state and enhances the performance of optical fiber sensors.

  • Vol. 16 No. 1 (2024)

    In the current issue of the Photonics Letters of Poland, one may find six papers related to different aspects of widely defined optics and photonics, including: the study of NIR luminescence in barium gallo-germanate glasses and antimony-germanate glass ceramics co-doped with bismuth, chromium, and with different lanthanide ions, respectively; investigation on the temperature dependence of the spectral characteristics of LED sources used in outdoor lighting; experimental studies on thermoelectric cooler-based thermal management method for improving the performance of LEDs; theoretical studies on the steady-state thermal model for white light LEDs thermal management application at encapsulant level; work on low-cost modular microscope with white LEDs for measuring fluorescent diamonds.

  • Vol. 15 No. 4 (2023)

    In the current issue of the Photonics Letters of Poland, one may find ten papers related to different aspects of photonics, including a variety of topics like: the realization of the tunable delay lines in the microwave regime utilizing the polarization and incident angle dependencies of azo-admixed liquid crystals (LCs); mathematical model for emission spectrum of white LED light sources with Gaussian function; studies on the current-voltage characteristics of n-CdSe/p-Si heterostructures; the optical E-band use in the NG-RAN/O-RAN radio signals transmission over optical distribution networks path; considerations on the dynamics of dark spatial solitons using a microscopic model based on the photorefractive transport equations; studies on the temperature effect on the luminescence profile of photonic materials for biological applications; method for evaluation of the optical uniformity distribution in the white LEDs-based visible light communication applications; model for studying the luminous flux behavior of phosphor-converted white LEDs; application of tunable LED illumination for biological tissue imaging; analysis of amplified spontaneous emission in ring-core Tm3+-doped optical fiber.

  • Vol. 15 No. 3 (2023)

    In the current issue of the Photonics Letters of Poland, one may find six papers related to different aspects of photonics like: 1) the generation of highly confined focal spots with extended focal depth with the use of azimuthally polarized Lorentz Gaussian vortex beam; 2) application of fiber optic sensors utilizing machine learning algorithms for temperature measurement of lithium-ion batteries; 3) using Digital Image Correlation as an optical full-field technique to provide precise and accurate identification of the character of the load applied to elements under test in the industrial environment; 4) discussion on the technological challenges of silica-titania thin film deposition via a simple and cost-effective sol-gel process and dip-coating method; 5) simulation and analyzes of four organic and inorganic materials performance to be utilized as hole transport layer in the design of germanium-based Perovskite Solar Cells; 6) synthesis, grown and characterization of 3ACPM single-crystal as a prospective option to be applied in the field of nonlinear optics.

  • Vol. 15 No. 2 (2023)

  • Vol. 15 No. 1 (2023)

    The current issue of Photonics Letters of Poland features papers related to various aspects of photonics, including: the design of  optical sensor for water turbidity to obtain precise water quality values without interference from outside light (unlike previous studies using conventional turbidity sensors); extraction and optical characterization of silica from reeds biomass in various annealing temperatures indicating a shift of the optical properties and dielectric functions towards longer wavelengths with an increase of annealing temperature; theoretical demonstration of the electric and magnetic energy densities and energy flux for radially variant vector beam focusing through a dielectric interface to generate novel focal structures for corresponding radial indices; the design of apodizer which significantly improves the performance of three-zone aberrated optical systems by increasing the intensity and suppressing the side lobes for higher degrees of defocus and primary spherical aberration thanks to application of specific amplitude filter.

  • Vol. 14 No. 4 (2022)

    Different aspects of optics and photonics, like, a mathematical model to determine the spectral power distribution of an LED luminaire for any level of dimming; a polymer tapered pillar on the SMF facet fabricated by a self-written waveguide technology using a high-numerical-aperture fiber; development of an algorithm suitable for real-time processing of matrix sensor data in laser beam positioning applications; a multiphoton scanning laser microscope based on a femtosecond frequency-doubled erbium-doped fiber laser; a new design of an amplifier for the miniature MEMS-type spectrometer, are described explicitly in the current issue of the Photonics Letters of Poland.

  • Vol. 14 No. 3 (2022)

    In the current issue of the Photonics Letters of Poland, one may find nine papers related to different aspects of photonics like: i) theoretical analysis of sensor structure based on the planar waveguide with a grating coupler to determine selected physical properties of blood; ii) AFM microscopy-based analysis of the influence of the oxidation method on the reduced graphene oxide; iii) microcrystalline diamond film evaluation by spectroscopic optical coherence tomography; iv) theoretical model of a planar broadband differential waveguide interferometer with gradient refractive index distribution; v) consideration of the color quality change when switching from fluorescent lamps to LEDs; vi) application of the 3D-FDTD method to design a refractive index sensor based on a slotted photonic crystal nanobeam cavity; vii) fabrication of a spot size expander using UV-curable resin on the end facet of a fiber with a high numerical aperture; viii) an experimental study of fiber-coupled fluorescence broadband light source suitable for spectroscopic applications; ix) analyzes the influence of the photo-polymerization process on the propagation properties of photonic crystal fiber filled with liquid crystalline mixture combined with reactive monomer and photoinitiator on the propagational properties. Eventually, the information about the 50th jubilee edition of the WILGA Symposium on Photonics Applications is given.

    This issue was co-finaced in the frame of R&D Project "Stadion2" realized in the frame of agreement between Faculty of Physics, Warsaw University of Technology and SVT sp. z o. o. sp. k. from 29.11.2019.

  • Vol. 14 No. 2 (2022)

    The current issue of Photonics Letters of Poland features nine papers related to various aspects of photonics, which include such topics as the determination of the refractive index of an egg's white and yolk depending on temperature; a new concept of a photovoltaic model characterized by increased efficiency obtained by using 3D flexible panels with additional reflecting mirror; the model of an optical sensor based on a two-mode interference in a planar gradient-step index configuration; an introduction to the sensor platforms of integrated photonic systems based on ceramic and polymer materials (HYPHa); the results of structural and optical measurements of undoped and europium doped LaPO4 phosphors for UV sensing applications; concept of field-of-view correction in a virtual reality head-mounted display with the use of the varifocal optics; investigation the effect of three graphite precursors on the size of reduced graphene oxide; optoelectronic system for detecting short-circuits in low-voltage networks; application of optical reflectometer for monitoring corrosion process.

  • Vol. 14 No. 1 (2022)

    In the current issue of the Photonics Letters of Poland, one may find papers related to different aspects of photonics like a numerical study on standard slot waveguide and double hybrid plasmonic waveguide based on a silicon-on-insulator platform; numerical investigations on a plasmonic sensor established on metal-insulator-metal waveguide configuration for refractive index sensing applications; the analyses of a laser dazzle generating three overlapping laser beams of different colors; the design and development of the LED-based lamp with adjustable spectrum; discussion on a Graphene-Molybdenum Disulphide Chitin Nanocomposite based passive Q-switcher.

  • Vol. 13 No. 4 (2021)

  • Vol. 13 No. 3 (2021)

    In the current issue of the Photonics Letters of Poland, one may find the papers related to different aspects of photonics like the development of a glucose meter using boric acid-modified carbon dots as a fluorescence probe; the derivation of an analytical expression for the cross-Kerr nonlinear coefficient in a four-level Y-type atomic system; the determination of the surface quality using the Fabry-Perot fiber-optic interferometer working in a reflective mode; the performance of Graphene Nanopowder-Polyvinyl Alcohol in optical pulse generation at 1.5-micron region; the possible application of a surface plasmon resonance (SPR) sensor for the medical diagnosis, chemical examination, and biological detection.

  • Vol. 13 No. 2 (2021)

    In the current issue of the Photonics Letters of Poland, one may find nine papers related to different aspects of photonics, including a variety of topics like: thermal infrared imaging combined with a two-step neural network-featured method as an efficient method for 3D face (masks) detection; methodology for characterization of typical CCD digital cameras with particular attention devoted to the nonlinearity correction method; demonstration of a simple and efficient method of covering standard AFM tips with nanodiamonds to make them visible under the fluorescence microscope and to suitable for performing spatially resolved magnetometry; application of different metrics (based on CIE 1931 and CIE 2015 observers) for describing the light color quality of white LED; design and implementation of the driver system for the Hamamatsu C12880MA microspectrometer; characterization of the emission spectra of rhodamine B and fluorescein solutions as a function of weight concentrations and wavelength of optical pump illumination; presentation of an algorithm for automatic detection of erroneous amplitude and phase components of a sample’s optical field, acquired by a holographic tomograph with limited angle of projection; discussion on the issues related to the need for different analyzes of the quality requirements of light sources in terms of color reproduction in the process of seeing and to the images recorded with cameras equipped with array detectors; studies on coupled nonlinear Schrödinger equations in focusing-defocousing medium solved with use of modified perturbation theory.

  • Vol. 13 No. 1 (2021)

    In the current issue of the Photonics Letters of Poland one may find seven papers related to different aspects of photonics including variety of topics like: supercontinuum generation with use of photonic crystal fiber infiltrated with olive oil, subluminal and superluminal light propagation in a vee-type three-level atomic medium under an external magnetic field, parametric resonance of acoustic and optical phonons in GaAs/GaAsAl quantum well in the presence of laser field, determination of chromatic dispersion for methanol-water mixtures at different concentration with use of Michelson interferometer system, analytical model to describe giant cross-Kerr nonlinear coefficient in a four-level Y-type atomic system, results of linearity testing of the integrated image sensor if a CCD-equipped digital camera, issues with evaluating readings of pulse oximeters used at home during the COVID-19.

  • Vol. 12 No. 4 (2020)

    In the current issue of the Photonics Letters of Poland one may find eleven papers related to different aspects of photonics including variety of topics like: performance analysis of MIMO communication system with a non-line-of-sight UV channel; chemical sensing in THz regime with use of photonic crystal fiber; low-cost laser-assisted photochemical method for preparing the surface-enhanced Raman probes based on silver nanostructures; overview of currently used greenhouse lighting systems; manufacturing and the results obtained for chocolate THz Fresnel lens; dispersion characteristics of solid-core photonic crystal fibers infiltrated with ethanol; estimation of electrorefractivity near the edge of the exciton absorption peak of GaAs/AlGaAs photorefractive quantum well structure working in the Franz-Keldysh geometry; alternative approach to variable wavelength interferometry; frequency dependence of electric field tunability in a photonic crystal fiber infiltrated with gold nanoparticles-doped nematic liquid crystal; in-house development of the high energy laser based on ytterbium doped silica single-mode fiber; measurement of the LED luminescence distribution depending on exposure parameters and on image focus settings.

    This issue was co-finaced in the frame of R&D Project "Stadion2" realized in the frame of agreement between Faculty of Physics, Warsaw University of Technology and SVT sp. z o. o. sp. k. from 29.11.2019.

  • Vol. 12 No. 3 (2020)

    This issue of the Photonics Letters of Poland contains seven papers that are related to: experimental investigations on high-power Er:ZBLAN fiber laser operating at around 2.8µm; synthesis and characterization of LVLVPM material in the form of an amino acid derivative crystal with potential applications in nonlinear optics; morphology and structure characterization of SnO2 nanowires produced with use of a hybrid electrospinning method combined with a heat treatment process at the temperature of 600oC; verification of the usefulness of commercially available granulates of PMMA and PS for the production of polymer optical fibers by extrusion method; numerical investigations on a metamaterial narrowband perfect absorber (with the maximum absorbance of 95.7%) formed by the periodic array of silicon meta-atoms placed on 80-nm-thick gold layer; numerical studies on a miniaturized design of the plasmonic Bragg grating filter based on metal-insulator-metal waveguide deposited on a quartz substrate operating in near-infrared wavelength range; numerical studies on C-band pass one-dimensional photonic crystal strip waveguide based on silicon-on-insulator platform to be easily realized with use of standard CMOS technology.

  • Vol. 12 No. 2 (2020)

    This Issue 12(2) Photonics Letters of Poland contains 15 articles that have successfully undergone review processes and have been accepted for publication. The subjects of this issue concern mainly the problems of optoelectronic and photonic sensors. The group of papers includes works on the application of optical methods in medical engineering, including: eye examination, monitoring of the vortex chamber of the artificial heart, optical visualization of human tissues, detection of hemoglobin. Part of the works concern the subject of gas sensors, realized in integrated optics, planar optics as well as in systems using optical fibers. The issue also includes works on the use of photonic techniques in physico-chemical tests of materials, including graphene oxide and reduced graphene oxide. The utilitarian nature of most works is important. It should be expected that the research topics presented in Issue 12(2) PLP will be continued and developed by the Authors in the future.

  • Vol. 12 No. 1 (2020)

    In current issue of the Photonics Letters of Poland one can find eight papers related to different aspects of photonics including some specific subjects like: design of highly sensitive sensor based on metal-insulator-metal square ring resonator incorporated with nano-dots, method to transmit photonic energy to power sensors using WDM multiplexing, demonstration of compact fiber Bragg grating accelerometer using transverse forces, method for creating a four-component RGBW smart lighting systems with white light having parameters close to daylight, studies on spectral properties of smart LED lamps, design of electroluminescent optical fiber sensor for detection of a high-intensity electric field, implementation of a digital holographic microscope for comparison of fixed and living biological cells parameters, possibility of low-cost fabrication of molds for PDMS-based photonic microstructures.

  • Vol. 11 No. 4 (2019)

    This issue of the Photonics Letters of Poland contains ten papers that are related to broadly defined photonics, optics and optoelectronics. Many different aspects are described, including those linked to light and illumination, such as the colored light pollution in the urban environment, the light color quality of LEDs operating at winter temperatures, comparison of luminance distribution on the lighting surface of power LEDs, and the role of light in the plants world. In addition, the optical characterization of tissue-simulating phantom components and the studies on the hyper-Rayleigh scattering first hyperpolarizability of a chalcone derivative in various solvent media are shown. Results of the thermal analysis and CW laser operation in end-pumped TM:YAP lasers, as well as the high-power, 100 W-class, thulium-doped all-fiber lasers are also presented. Finally, the projection of holographic images in volumetric fluorescent fluids for near-eye displays and the fabrication of polymer micro-lenses for low-cost light coupling into integrated waveguide circuits are discussed.

  • Vol. 11 No. 3 (2019)

    This issue was guest edited by Salvador X. Bara (Universidade de Santiago de Compostela) and Irena Fryc (Bialystok University of Technology).

    The current issue of the Photonics Letters of Poland contains ten papers that describe many different aspects at photonics. There are papers about: Photometry and Multispectral Estimation (Univ. Santiago de Compostela, Univ. Murcia, Univ Complutense de Madrid), Entropy and Transmision (Univ. Estadual de Goiás, Univ. Paulista, Univ. Federal da Paraíba, Univ. Federal de Goiás), different Aspects of Light Pollution (Bialystok Univ. of Technology, Warsaw Univ. of technology and Lodz Univ. of Technology), Measurements of Sky Brightness (Krakow Univ. of Technology), Fiber Lasers (Military Univ. of Technol.), Conductive Polymers (Silesian Univ. of Technol.), and 3D Printing (Gdansk Univ. of Technol.). The papers give a flavor of selected research activities of Photonics Society of Poland Board members and their collaborators.

  • Vol. 11 No. 2 (2019)

    The current 10th Anniversary issue of the Photonics Letters of Poland contains ten papers that describe principal activities in photonics as: Photonic Liquid Crystal Fibers (Warsaw Univ. of Technology), Biooptics (Poznań), Dedicated Optical Systems and Diffractive Gratings (Institute of Applied Optics, Warsaw), Fiber Lasers (Wrocław Univ. of Technology), Optical Coherence Imaging (Toruń and Warsaw), Active Optical Fibers (Białystok and Cracow), and Gas Sensing (Gliwice). The papers give a flavor of selected research activities of Photonics Society of Poland Board members and their collaborators.

  • Vol. 11 No. 1 (2019)

    This issue contains seven regular papers devoted to various aspects of photonics: from manufacturing optical elements (including optical fibers, also with liquid crystals as a cladding), trough possibility of qualitative visualization of the surface defects on semiconductor wafers (thanks to the Makyoh-topography imaging), to applications (investigation of two-photon vision and brain-computer interface). These articles prove that photonic tools, elements and devices seem to be necessary in modern technology.
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