Showing papers by "Marian Marciniak published in 2014"

Effect of Periodicity in the Resonant Scattering of Light by Finite Sparse Configurations of Many Silver Nanowires

Abstract: We consider the two-dimensional (2-D) scattering of the H- and E-polarized plane waves by several discrete configurations made of M> > 1 periodically arranged circular cylindrical silver wires. To find the scattered field, we use the field Fourier expansions in local coordinates and addition theorems for cylindrical functions. Resulting M × M block-type matrix equation is cast to the Fredholm second-kind form that guarantees convergence of numerical solution when each block is truncated to finite dimensions and truncation order is taken larger. The scattering and absorption cross-sections and the near-field patterns are computed. The interplay of plasmon and grating-type resonances is studied for finite in-line and stacked arrays, corners, and crosses made of nano-size silver wires in the visible range of wavelengths, with the refractive index of silver taken from the experimental data.

Seeing the order in a mess: optical signature of periodicity in a cloud of plasmonic nanowires.

Abstract: We consider the two-dimensional (2-D) problem of the H-polarized plane wave scattering by a linear chain of silver nanowires in a cloud of similar pseudo-randomly located wires, in the visible range. Numerical solution uses the field expansions in local coordinates and addition theorems for cylindrical functions and has a guaranteed convergence. The total scattering cross-sections and near- and far-zone field patterns are presented. The observed resonance effects are studied and compared with their counterparts in the scattering by the same linear chain of wires in free space.

Glass-ceramics for photonics: Advances and perspectives

Abstract: Glass-ceramics are nanocomposite materials which offer specific characteristics of capital importance in photonics. This kind of two-phase materials is constituted by nanocrystals embedded in a glass matrix and the respective composition and volume fractions of crystalline and amorphous phase determine the properties of the glass-ceramic. Among these properties transparency is crucial, in particular when confined structures, such as dielectric optical waveguides, are considered, and several works have been devoted to this topic. Another important point is the role of the nanocrystals when activated by luminescent species, as rare earth ions, and their effect on the spectroscopic properties of the glass-ceramic. The presence of the crystalline environment around the rare earth ion allows high absorption and emission cross sections, reduction of the non-radiative relaxation thanks to the lower phonon cut-off energy, and tailoring of the ion-ion interaction by the control of the rare earth ion partition. Fabrication, assessment and application of glass-ceramic photonic systems, especially waveguides, deserve an appropriate discussion which is the aim of this paper, focused on luminescent glass-ceramics. In this work, a brief historical review, consolidated results and recent advances in this important scientific and technological area will be presented, and some perspectives will be outlined.

Brewster’s angle polarizer design based on a gyrotropic double-periodic perforated layer

Abstract: This paper is devoted to the study of the features of artificial gyrotropic magneto-dielectric layer with two-dimensional periodicity. Such a layer can be used in the development of the polarizers operating in the microwave and optical ranges. Analytical solution of a plane wave scattering from a double-periodic gyrotropic layer is obtained by the Method of Integral Functionals in the quasi-static approximation. The numerical results allow to realize the TE- and TM-pass Brewster’s angle polarizers.

Metal-dielectric layered structure supporting surface plasmons: Numerical modelling by the method of single expression

Abstract: Surface plasmons' (SPs) excitation in Kretschmann-type structure, where a thin metallic layer upon the dielectric prism substituted by a metal-dielectric layered (MDL) structure, is analysed via numerical simulation. Four possible alternations in MDL structure at fixed metallic and dielectric layers' thickness are considered and favorable structure is indicated. It is revealed, that MDL structures support SPs when the sum of metallic layers' thickness is about the thickness of a single metallic layer in conventional Kretschmann structure.

Red photonic glasses and confined structures

Abstract: a IFN CNR CSMFO Lab. & FBK CMM, via alla Cascata 56/C Povo, 38123 Trento, Italy, b Institute of Low Temperature and Structure Research, PAS, 2 Okolna St., 50-422 Wroclaw, Poland. c Politecnico di Milano, Dipartimento di Fisica and IFN-CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy. d Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, Via Giovanni Pascoli, 70/3, 20133, Milan, Italy. e Ruđer Boskovic Institute, Division of Materials Physics, Laboratory for Molecular Physics, Bijenicka c. 54, Zagreb, Croatia. f Center of Excellence for Advanced Materials and Sensing Devices, Research unit New Functional Materials, Bijenicka c. 54, Zagreb, Croatia. g Dipartimento di Fisica, Universita di Trento, via Sommarive 14, Povo, 38123 Trento, Italy. h School of Physics, University of Hyderabad, Hyderabad 500046, India. i FBK -CMM, ARES Unit, 38123 Trento, Italy. j Bialystok University of Technology, Department of Power Engineering, Photonics and Lighting Technology, 45D Wiejska St., Bialystok 15-351, Poland. k College of Engineering, Swansea University, Singleton Park, Swansea, UK. l Departamento de Quimica, Universidade de Sao Paulo, Av. Bandeirantes, 3900, CEP 14040901, Ribeirao Preto/SP, Brazil. m Centro di Studi e Ricerche Enrico Fermi, P.zza Viminale 1, 00184 Roma, Italy n IFAC CNR, MiPLab, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy.

Fabrication and Spectroscopic Assessment of Glass-Based Sub-Wavelength Structures for Hybrid 1-D Dielectric 633-nm Laser Microcavity

Abstract: A low-loss 20-micron thickness 1-D multilayer dielectric microcavity constituted by PMMA polymer matrix containing CdSe@ZnS quantum dots was fabricated by a hybrid radiofrequency-sputtering/sol-gel deposition process. Emission enhancement at 633-nm wavelength has been observed.

Enhancing the circular waveguide microresonator temperature measurement sensitivity and accuracy by using liquid crystal gap filling

Abstract: We consider the design methods and principles of operation of a fast-response integrated optical sensor for temperature measurement. The sensitive element consists of a microring resonator based on the double-slot waveguide made from Si 3N4 and coated on a SiO2 buffer layer, which is disposed on a silicon substrate. The nematic 5CB liquid crystal (LC) fills the slots of the ring waveguide. The sensor uses only the optical radiation, and the electrical current is not supplied to the measured matter. That allows applying such sensor for measuring the temperature of highly inflammable liquids and gases. The use of the microresonators based on the double-slot waveguides considerably (more than one order of magnitude) increases the sensor sensitivity. The operating speed of the device is defined by the time of establishing the steady-state regime in the ring microresonator and equals to tens of nanoseconds. The measuring device can consist of a large number of such sensing elements that allows simultaneously controlling the temperature in different points of the fluid flow or the matter volume. The sensor has a micrometer size and can be produced by using routine integrated technologies.