Michał Wasiak
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View article: Large-Area Metal-Integrated Grating Electrode Achieving Near 100% Infrared Transmission
Large-Area Metal-Integrated Grating Electrode Achieving Near 100% Infrared Transmission Open
Highly transparent and conductive electrodes operating in the infrared (IR) are critically needed for a broad range of technologies, including light-emitting diodes, lasers and photodetectors, which are key building blocks of infrared came…
View article: Robustness of monolithic high-contrast grating focusing mirrors to random variations in geometrical parameters
Robustness of monolithic high-contrast grating focusing mirrors to random variations in geometrical parameters Open
One of the critical challenges in designing focusing mirrors based on monolithic high-contrast gratings (MHCGs) is the precise selection of geometrical parameters for each individual stripe, to ensure that the reflected light acquires the …
View article: Bose–Einstein condensation of photons in a vertical-cavity surface-emitting laser
Bose–Einstein condensation of photons in a vertical-cavity surface-emitting laser Open
Many bosons can occupy a single quantum state without a limit. It is described by the quantum-mechanical Bose–Einstein statistic, which allows Bose–Einstein condensation at low temperatures and high particle densities. Photons, historicall…
View article: Comparison of TJ and ITO GaN VCSELs in terms of their frequency characteristics
Comparison of TJ and ITO GaN VCSELs in terms of their frequency characteristics Open
The work focuses on vertical cavity surface emitting lasers (VCSELs) made of nitride materials that emit a wavelength of 445 nm. Two structures were examined: a laser with a tunnel junction and implantation (TJ VCSEL) and an ITO contact (I…
View article: Numerical model of capacitance-related phenomena in semiconductor lasers based on partial differential equations
Numerical model of capacitance-related phenomena in semiconductor lasers based on partial differential equations Open
This paper presents a model of the capacitance and electrical properties of semiconductor lasers biased with modulated voltage. The model is based on the finite-element method (FEM), which is widely used in computer modelling and is a natu…
View article: Bose-Einstein condensation of photons in a vertical-cavity surface-emitting laser
Bose-Einstein condensation of photons in a vertical-cavity surface-emitting laser Open
Many bosons can occupy a single quantum state without a limit. This state is described by quantum-mechanical Bose-Einstein statistics, which allows the formation of a Bose-Einstein condensate at low temperatures and high particle densities…
View article: Thermal analysis of a two-dimensional array with surface light emission based on nitride EEL lasers
Thermal analysis of a two-dimensional array with surface light emission based on nitride EEL lasers Open
This paper presents the results of a thermal computational analysis of a two-dimensional laser array emitting from a surface. The array consisted of eight equispaced ridge-waveguide edge-emitting nitride diode lasers. Surface emission of l…
View article: True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry Open
There are many reports in the literature of bound states in the continuum (BICs) in systems with up–down mirror symmetry. Semiconductor-based technology requires bulk semiconductor substrates, which impose symmetry breaking in the vertical…
View article: Nearly total optical transmission of linearly polarized light through transparent electrode composed of GaSb monolithic high-contrast grating integrated with gold
Nearly total optical transmission of linearly polarized light through transparent electrode composed of GaSb monolithic high-contrast grating integrated with gold Open
Achieving high transmission of light through a highly conductive structure implemented on a semiconductor remains a challenge in optoelectronics as the transmission is inevitably deteriorated by absorption and Fresnel reflection. There hav…
View article: Effective method for approximating graded-refractive-index layers in optical simulations
Effective method for approximating graded-refractive-index layers in optical simulations Open
In this paper, we present an approximation intended to find applications in numerical simulations of optical phenomena in layered structures. The method can be used to avoid approximating graded layers by using numerous homogeneous layers …
View article: Chromatic aberration in planar focusing mirrors based on a monolithic high contrast grating
Chromatic aberration in planar focusing mirrors based on a monolithic high contrast grating Open
We present an experimental and theoretical analysis of chromatic aberration in a monolithic metasurface focusing mirror. The planar focusing mirror is based on a monolithic high contrast grating made from GaAs, designed for a wavelength of…
View article: Boosting the output power of large-aperture lasers by breaking their circular symmetry
Boosting the output power of large-aperture lasers by breaking their circular symmetry Open
Breaking the spatial symmetry in optical systems has become a key approach to the study of nonlinear dynamics, wave chaos, and non-Hermitian physics. Moreover, it enables tailoring of the spatiotemporal properties of such systems. Breaking…
View article: Experimental Demonstration of Light Focusing Enabled by Monolithic High-Contrast Grating Mirrors
Experimental Demonstration of Light Focusing Enabled by Monolithic High-Contrast Grating Mirrors Open
We present the first experimental demonstration of a planar focusing monolithic subwavelength grating mirror. The grating is formed on the surface of GaAs and focuses 980 nm light in one dimension on the high-refractive-index side of the m…
View article: First vertical-cavity surface-emitting laser made entirely in Poland
First vertical-cavity surface-emitting laser made entirely in Poland Open
The paper presents the first vertical-cavity surface-emitting lasers (VCSELs) designed, grown, processed and evaluated entirely in Poland. The lasers emit at »850 nm, which is the most commonly used wavelength for short-reach (<2 km) op…
View article: Planar focusing reflectors based on monolithic high contrast gratings: design procedure and comparison with parabolic mirrors
Planar focusing reflectors based on monolithic high contrast gratings: design procedure and comparison with parabolic mirrors Open
Here, we describe in detail a procedure for the numerical design of planar focusing mirrors based on monolithic high contrast gratings. We put a special emphasis on the reconstruction of the hyperbolic phase of these mirrors and we conclud…
View article: Transparent electrode employing deep–subwavelength monolithic high-contrast grating integrated with metal
Transparent electrode employing deep–subwavelength monolithic high-contrast grating integrated with metal Open
This paper demonstrates designs of transparent electrodes for polarized light based on semiconductor deep-subwavelength monolithic high-contrast gratings integrated with metal (metalMHCG). We provide theoretical background explaining the p…
View article: Numerical model for small-signal modulation response in vertical-cavity surface-emitting lasers
Numerical model for small-signal modulation response in vertical-cavity surface-emitting lasers Open
We present a numerical model allowing for simulations of small-signal modulation (SSM) response of vertical-cavity surface-emitting lasers (VCSELs). The model of SSM response utilizes only the data provided by a static model of continuous-…
View article: Numerical Investigation of the Impact of ITO, AlInN, Plasmonic GaN and Top Gold Metalization on Semipolar Green EELs
Numerical Investigation of the Impact of ITO, AlInN, Plasmonic GaN and Top Gold Metalization on Semipolar Green EELs Open
In this paper, we present the results of a computational analysis of continuous-wave (CW) room-temperature (RT) semipolar InGaN/GaN edge-emitting lasers (EELs) operating in the green spectral region. In our calculations, we focused on the …
View article: Monolithic high-contrast grating planar microcavities
Monolithic high-contrast grating planar microcavities Open
Semiconductor planar microcavities significantly enhance the interaction between light and matter and are thus crucial as a fundamental research platform for investigations of quantum information processing, quantum dynamics, and exciton-p…
View article: ITO layer as an optical confinement for nitride edge-emitting lasers
ITO layer as an optical confinement for nitride edge-emitting lasers Open
This paper presents the results of a numerical analysis of nitride-based edge-emitting lasers with an InGaN/GaN active region designed for continuous wave room temperature emission of green and blue light. The main goal was to investigate …
View article: Impact of the active area position in a nitride tunnel junction vertical-cavity surface-emitting laser on its emission characteristics
Impact of the active area position in a nitride tunnel junction vertical-cavity surface-emitting laser on its emission characteristics Open
This paper presents results of numerical simulations of a nitride semiconductor vertical-cavity surface-emitting laser (VCSEL) with a tunnel junction. The modeled laser is based on a structure created at the University of California in San…
View article: Current dependence of resistances and capacitances in a vertical-cavity surface-emitting laser
Current dependence of resistances and capacitances in a vertical-cavity surface-emitting laser Open
Based on the model of impedance and modulation time constants for vertical-cavity surface-emitting lasers (VCSELs) we study the resistances and capacitances of an equivalent circuit as a function of the current flowing through the VCSEL. W…
View article: Impact of strain on periodic gain structures in vertical external cavity surface-emitting lasers
Impact of strain on periodic gain structures in vertical external cavity surface-emitting lasers Open
In this article, the impact of strain relaxation on the emission properties of InGaAs/GaAs multiple quantum wells without strain compensation was examined. Structures consisting of different numbers of quantum wells, namely 4, 8, 12 and 16…
View article: Dual-wavelength vertical external-cavity surface-emitting laser: strict growth control and scalable design
Dual-wavelength vertical external-cavity surface-emitting laser: strict growth control and scalable design Open
This paper reports on the design and fabrication of a dual-wavelength vertical external-cavity surface-emitting laser. Grown by molecular beam epitaxy, the laser structures have a relatively simple active region divided into two sections, …