Dr. Maciej Dems
Institute of Physics, Lodz University of Technology, 90-924 Lodz, Poland
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Academic Career Length
24Years (2003-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 January 2005 in Optics Express
Journal Article
In this article we present a novel approach for determining the electromagnetic modes of photonic multilayer structures. We combine the plane wave expansion method with the method of lines resulting in a fast and accurate computational technique which we named the plane wave admittance method. In addition, we incorporate perfectly matched layers at the boundaries parallel to the multilayer surfaces which allow for easy determination of leaky modes. The convergence of the method is verified for the case of photonic crystal slab showing very good agreement with the results obtained with full three-dimensional plane wave expansion method while the numerical effort is largely reduced. The numerical implementation of the method will be soon available on the web.
24 April 2015 in Optics Express
Journal Article
MGM. Gębski
M. GębskiMaciej DemsASA. Szerling
A. Szerling
MMM. Motyka
M. Motyka
LML. Marona
L. MaronaTCT. Czyszanowski
T. Czyszanowski +9
In this paper we present an extensive theoretical and numerical analysis of monolithic high-index contrast grating, facilitating simple manufacture of compact mirrors for very broad spectrum of vertical-cavity surface-emitting lasers (VCSELs) emitting from ultraviolet to mid-infrared. We provide the theoretical background explaining the phenomenon of high reflectance in monolithic subwavelength gratings. In addition, by using a three-dimensional, fully vectorial optical model, verified by comparison with the experiment, we investigate the optimal parameters of high-index contrast grating enabling more than 99.99% reflectance in the diversity of photonic materials and in the broad range of wavelengths.
1 January 2007 in Optics Express
Journal Article
TCTomasz Czyszanowski
Tomasz CzyszanowskiMaciej Dems
Krassimir PanajotovOptics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.
6 January 2007 in Optical and Quantum Electronics
Journal Article
PBP. Bienstman
P. Bienstman
Stefano Selleri
Lorenzo RosaHUH. P. Uranus
H. P. UranusWHW. C. L. Hopman
W. C. L. Hopman
Krassimir Panajotov +8
21 July 2016 in Optics Letters
Journal Article
MMMagdalena Marciniak
Magdalena Marciniak
MGMarcin Gębski
Marcin GębskiMaciej DemsEHErik Haglund
Erik Haglund
ALAnders Larsson
Anders Larsson
TCTomasz Czyszanowski
Tomasz Czyszanowski +2
In this Letter a fully vectorial numerical model is used to search for the construction parameters of monolithic high-contrast grating (MHCG) mirrors providing maximal power reflectance. We determine the design parameters of highly reflecting MHCG mirrors where the etching depth of the stripes is less than two wavelengths in free space. We analyze MHCGs in a broad range of real refractive index values corresponding to most of the common optoelectronic materials in use today. Our results comprise a complete image of possible highly reflecting MHCG mirror constructions for potential use in optoelectronic devices and systems. We support the numerical analysis by experimental verification of the high reflectance via a GaAs MHCG designed for a wavelength of 980 nm.
About Me
Dr. Maciej Dems is an Associate Professor at Lodz University of Technology, Poland, where he completed his M.Sc. and Ph.D. degrees in Physics in 2002 and 2007, respectively, and earned his habilitation in Physics from the University of Warsaw in 2018. He has led several R&D projects funded by the Polish National Centre for Research and Development and the National Science Centre, resulting in publications in high-impact journals and advancements in photonic device technologies. His research interests include sub-wavelength photonic devices such as photonic crystals, high-contrast gratings, DFB lasers, and micro-structured VCSELs. Dr. Dems has developed numerical methods for analyzing photonic structures and authored PLaSK, a comprehensive software suite for multi-physics photonic simulations. His work has been cited over 1,290 times, reflecting his influence in the field. He also actively contributes to international photonics conferences, advancing applications in telecommunications, sensing, and related fields.