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    Wyświetlanie 1-13 z 13
    Tytuł:
    Efficient, low-cost optical coupling mechanism for TiO2-SiO2 sol-gel derived slab waveguide surface grating coupler sensors
    Autorzy:
    Kaźmierczak, Andrzej
    Słowikowski, Mateusz
    Pavłov, Krystian
    Filipiak, Maciej
    Vervaeke, Michael
    Tyszkiewicz, Cuma
    Ottevaere, Heidi
    Piramidowicz, Ryszard
    Karasiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1835968.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polymer microlens
    optical coupling
    surface grating coupler
    Opis:
    We present an optical signal coupling scheme for slab waveguide surface grating coupler sensors. The proposed solution is based on the use of polymer microlenses. In this work we analyze two types of compact polymer lenses: the aspheric plano-convex lenses and Fresnel lenses. The feasibility of the proposed scheme is demonstrated by the experimental investigation into the optical signal coupling to the test structure of TiO2-SiO2 slab waveguide surface grating coupler using both types of lenses.
    Źródło:
    Optica Applicata; 2020, 50, 4; 539-549
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron-Optical Phonon Coupling in Double-Barrier Quantum Well Structure
    Autorzy:
    Kaczmarek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932087.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    63.20.Kr
    Opis:
    The electron-LO phonon coupling constant for double-barrier quantum well structure was calculated using the Frohlich model of the electron-phonon interaction and assuming coupling of the confined electron with bulk LO phonon mode. Magnitude of the Huang-Rhys factor g and possibility of detecting of phonon replicas in the resonant tunneling current are discussed for GaAs-Al$\text{}_{x}$Ga$\text{}_{1-x}$As and CdTe based structures.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 233-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Nonlinear Elasticity and Electromechanical Coupling on Optical Properties of InGaN/GaN and AlGaN/AlN Quantum Wells
    Autorzy:
    Łepkowski, S. P.
    Majewski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046928.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    62.20.Dc
    77.65.-j
    Opis:
    We present theoretical studies of effects of the nonlinear elasticity and the electromechanical coupling on the optical properties of InGaN/GaN and AlGaN/AlN quantum wells. In these structures, due to the lattice misfit between constituents, the quantum wells are compressively strained and the intrinsic hydrostatic pressure is present. Therefore, the nonlinear elasticity is investigated by taking into account the pressure dependence of elastic stiffness tensor for the strained quantum wells. We show that this effect leads to (i) decrease in the volumetric strain and (ii) increase in the polarization-induced built-in electric field in the quantum wells. Consequently, the interband transition energies in the quantum wells decrease when the nonlinear elasticity of nitrides is considered. On the other hand, we show that the effect of electromechanical coupling, i.e., co-existence of ordinary and converse piezoelectric effects results in increase in the interband transition energies in the considered quantum wells. It turns out that the influence of the nonlinear elasticity on the optical properties is stronger than the influence of electromechanical coupling for InGaN/GaN quantum wells, while for AlGaN/GaN the opposite situation is observed.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 237-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2,2'- Dihydroksy-1,1'-binaftyl (BINOL ) i jego pochodne. Wybrane syntezy i zastosowanie. Część I
    2,2'-Dihydroxy -1,1'-binaphthyl (BINOL ) and its derivatives: Selected synthesis methods and applications. Part I
    Autorzy:
    Krasowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/172527.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    BINOL
    atropoizomery
    utleniające sprzęganie
    enancjoselektywna synteza
    chiralne ligandy
    atropoisomers
    oxidative coupling
    optical resolution
    enantioselective synthesis
    chiral ligands
    Opis:
    1,1’-Binaphthyl and its derivatives represent a particular class of chemical molecules which chirality results from the restricted rotation about single bond of the two naphthalene rings. This generates the chirality axis. Therefore 1,1’-binaphthyl derivatives exist as two enantiomeric forms called atropoisomers. Moreover, 1,1’- binaphthyls with substituents at 2,2’ position exhibit higher rotational barriers around the 1,1’-axis, which affect a very stable chiral configuration. The classical examples of such molecules is 2,2-dihydroxy-1,1’-binaphthyl (BINOL ), which has become one of the most utilized chiral ligand and auxiliary for diverse asymmetric syntheses. The unchallenged success of BINOL and its derivatives in the field of transition metal-catalyzed asymmetric reactions or C-C bond forming reactions promoted worldwide an advancement of organic synthesis. The first synthesis of BINOL as racemate was described in 1873. Since then there have been found numerous efficient methods of racemic or enantiomerically pure BINOL preparation and its derivatization. In order to present a brief overview of the most convenient and facile routes to obtain racemic and nonracemic symmetrically substituted 1,1’-binaphthyls based on stoichiometric and catalytic oxidative coupling, classical optical resolution, kinetic enzymatic resolution of racemic mixture or regioselective modification of the binaphthol scaffold the following article is presented.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 5-6; 485-528
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulating the effects of refractive index difference on the coupling efficiency of periodically segmented waveguide mode converter
    Autorzy:
    Zheng, Yu
    He, Hao
    Jiang, Lianqiong
    Duan, Ji'an
    Powiązania:
    https://bibliotekanauki.pl/articles/2033880.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coupling efficiency
    silica waveguide
    planar lightwave circuit
    micro-optical waveguide
    nano-optical waveguide
    Opis:
    Efficient coupling of micro/nano-optical waveguides with single-mode fibers is the premise for the efficient operation of the integrated photonic chip, which directly determines its optical performance. In this paper, the design principles of periodically segmented waveguide (PSW) structure used for high-efficiency fiber-chip coupling are proposed, and the effects of refractive index difference Δ on coupling efficiency and structural parameters are studied by simulation. It is found that as the Δ of the PSW increases, the period of the PSW tends to be smaller, and the coupling efficiency decreases continuously, reduced by around 0.673 dB in the range of Δ = 3% to Δ = 7%. Through the analysis of PSW optical mechanisms, it demonstrates that the main reason for the decrease of coupling efficiency is that the transmission loss of the tapered section increases sharply with the increase of Δ. High-Δ PSW is difficult to apply to highly integrated silica optical chips due to the unignorably insertion loss.
    Źródło:
    Optica Applicata; 2021, 51, 4; 565-577
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Realization of optical fibers terminated with ball lenses
    Autorzy:
    Guzowski, B.
    Lisik, Z.
    Tosik, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/200929.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microlens
    coupling
    optical fiber
    active elements
    mikrosoczewki
    sprzęganie
    światłowód
    elementy aktywne
    Opis:
    In this article the process of realization of ball-lensed optical fibers is described. The implementation of four different types of ball-lensed optical fibers developed in Optical Fibers Techniques Laboratory at Lodz University of Technology is presented. Focal lengths of the presented microlenses, which were obtained in simulations and measurements, are also shown in this paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 279-282
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates
    Autorzy:
    Roszkiewicz, A.
    Nasalski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/202304.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fresnel zone plates
    focusing
    cross-polarisation coupling
    optical vortices
    Opis:
    Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with the short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 855-861
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of coupling effect between a unidirectional air waveguide and two cavities with one-way rotating state
    Autorzy:
    Gao, Yongfeng
    He, Liu
    Jiang, Zhen
    Zhou, Jun
    Shi, Yuejia
    Bai, Wenfang
    Powiązania:
    https://bibliotekanauki.pl/articles/174202.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    waveguide-cavity coupling
    magneto-optical photonic crystal
    unidirectional air waveguide
    one-way rotating state
    finite element method
    Opis:
    In the paper we present an implementation of resonance coupling between a unidirectional air waveguide and two cavities with one-way rotating state in a two-dimensional dielectric photonic crystal and a magneto-optical photonic crystal. We theoretically calculate the dispersion curves of the line defect waveguide and the dispersion curves of waveguide-cavity interaction, respectively. Numerical simulations show that, via waveguide-cavity coupling, a series of interesting resonance phenomena can be generated in the system. By modifying direction of the applied external magnetic field, storing and discharging of photonic energy can be realized. Our work may provide a practical and useful guidance for optical communications.
    Źródło:
    Optica Applicata; 2020, 50, 1; 49-59
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Methods for Calculating Coupling Length in Step-Index Optical Fibers
    Autorzy:
    Savović, S.
    Djordjevich, A.
    Drljača, B.
    Kovačević, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795634.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.81.Qb
    42.81.Uv
    Opis:
    A recently reported function for calculation of the coupling length at which the equilibrium mode distribution is achieved in step-index plastic optical fibers is compared to a long established calculation method and to experimental findings. The recent function, while simpler to apply as it eliminates the need to numerically solve the power flow equation repeatedly for every case, is also more accurate for high numerical aperture (0.45 to 0.5) plastic optical fibers.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 652-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling the biexciton-exciton cascade kinetics in a quantum dot via coupling to a microcavity optical mode
    Autorzy:
    Sęk, G.
    Krizhanovskii, D.
    Kulakovskii, V.
    Reitzenstein, S.
    Kamp, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1160147.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.35.-y
    78.55.-m
    42.50.Pq
    Opis:
    The luminescence of single and two exciton states in a quantum dot embedded in the active layer of a micropillar cavity has been investigated. Temperature tuning has been used to bring the energy states of the quantum dot and the cavity into resonance. Studying the resonance behavior of the exciton and biexciton transitions with cavity mode revealed a similar Purcell effect for both lines. The cavity-induced changes of the respective radiative lifetimes have been shown to allow for controlling the ratio between the single and two exciton occupation and their relative emission rates in a single quantum dot.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-44-A-47
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2,2’-dihydroksy-1,1’-binaftyl (BINOL) i jego pochodne. Wybrane syntezy i zastosowanie. Część. II
    2,2’-dihydroxy-1,1’-binaphthyl (BINOL) and its derivatives : selected synthesis methods and applications. Part II
    Autorzy:
    Krasowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/172097.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    BINOL
    atropoizomery
    utleniające sprzęganie
    enancjoselektywna synteza
    chiralne ligandy
    atropoisomers
    oxidative coupling
    optical resolution
    enantioselective synthesis
    chiral ligands
    Opis:
    An invention of new catalytic strategies for stereoselective synthesis is of current interest to many laboratories worldwide . Over the past few decades a remark - able progress in the field of stereocontrolled synthesis has been achieved with chiral 1,1’-binaphthyl compounds. Optically active 1,1’-binaphthyl-2,2’-diol (BINOL) and its derivatives due to their axial dissymmetry and molecular flexibility have been widely utilized as chiral ligands and auxiliaries in stoichiometric or catalytic asymmetric reactions, such as metal-catalysed transformations and enantioselective organocatalysis. BINOL and its functionalized analogues have demonstrated remark - able chiral discrimination properties. Extensive studies on molecular recognition provided the successful results in the application of BINOL as a host for an optical resolution of racemic guests and as a chiral NMR shift reagent for the determination of chiral compounds. It has been found that the axial chirality of binaphthyl units in host molecules is crucial contribution to their stereoselctive complexation with chiral guests.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 1-2; 55-92
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki, selenu i telluru. Część 2. Sulfurany 10-S-3 i 10-S-4
    Hypervalent compounds of sulfur, selenium and tellurium. Part 2. Sulfuranes 10-S-3 and 10-S-4
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172591.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    sulfuran
    pseudorotacja Berry'ego
    bipiramida trygonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    sprzęganie ligandów
    wymiana liganda
    hypervalency
    3c-4e bond
    sulfurane
    Berry pseudorotation
    trigonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    ligand coupling
    ligand exchange
    Opis:
    The compounds presented herein are sulfuranes 10-S-3 and 10-S-4 containing hypervalent sulfur atom. They have been known for a relatively long time. Nevertheless, they, and especially 10-S-4 species, are still of great interest due to their unique properties. The review presents recent approaches to the synthesis of these compounds, their selected structural, physical, chemical, stereochemical and electronic properties and their use as reagents and catalysts in several reaction types. The presence of structures of these types as intermediates, which explains selected reaction mechanisms, will also be shown.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 7-8; 593-622
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki , selenu i telluru. Część 3. Sulfuran Martina , sulfurany 10-S-5 i 12-S-6
    Hypervalent compounds of sulfur, selenium and tellurium. Part 3. Martin su lfurane , sulfuranes 10-S-5 and 12-S-6
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171640.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    sulfuran
    persulfuran
    sulfuran Martina
    bipiramida trygonalna
    bipiramida tetragonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    sprzęganie ligandów
    hypervalency
    3c-4e bond
    sulfurane
    persulfurane
    Martin sulfurane
    trigonal bipyramid
    tetragonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    ligand coupling
    Opis:
    In this part of the review one of the most famous 10-S-4 sulfurane called Martin sulfurane together with sulfuranes 10-S-5 and persulfuranes 12-S-6 will be presented. Martin sulfurane has been well known for a relatively long time but it is still useful in organic synthesis as a dehydrating, coupling and oxidizing agent. Its use in selected substitution reactions will be also described. Next, synthesis and selected properties of sulfuranes 10-S-5, mainly sulfurane oxides, and persulfuranes 12-S-6, will be shown. Besides synthetic methods, the review is focused on the investigations of the stability and isomerization of these types of compounds, which is particularly interesting for persulfuranes, because of the presence of three 3c-4e bonds.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 9-10; 893-907
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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