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    Wyświetlanie 1-12 z 12
    Tytuł:
    Wide-angle infrared plasmonic perfect absorber based on graphene-silica grating
    Autorzy:
    Chen, Fang
    Powiązania:
    https://bibliotekanauki.pl/articles/1835755.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasmonic resonance
    graphene grating
    optical absorption
    plasmonic absorber
    Opis:
    In this paper, wide-angle infrared perfect absorption has been demonstrated by using a double-layer graphene strip grating coupled with a silicon dioxide grating. Numerical simulation of the finite-difference time-domain method indicates that the perfect absorption can be achieved due to the effective impedance matching, and all the incident electromagnetic energy is confined in the Al2O3 layer between the silver substrate and the graphene strip grating. Dual-band perfect absorption is achieved with the change of strip width or chemical potential of the bi-layer graphene strip grating. It is found that the spectral position of the absorption peak can be tuned by the chemical potential or the width of the graphene strip, and additionally by the size of the proposed absorber. Moreover, the proposed perfect absorber shows excellent absorption stability for a wide range of the incident angle up to ±65°. The proposed absorber may find potential application in tunable double band perfect absorbers in the mid-infrared range.
    Źródło:
    Optica Applicata; 2021, 51, 1; 87-95
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High sensitivity microsensor assisted by Fano resonance in InSb based terahertz plasmonic waveguide
    Autorzy:
    Liu, Huaiqing
    Zhong, Shuomin
    Xu, Gaoming
    Powiązania:
    https://bibliotekanauki.pl/articles/173246.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasmonic
    microsensor
    terahertz
    Fano resonance
    Opis:
    We propose a compact terahertz plasmonic structure comprising an InSb-dielectric-InSb waveguideside-coupled with two stub resonators. Due to the coherent interference of the splitting discrete andquasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which stems from the phase difference between the two stub resonators. Owing to the permittivity temperature dependent property of InSb, the Fano resonance dip can be actively controlled by tuning temperature. The physical features contribute to a highly efficient plasmonic sensor for both refractive index and temperature sensing. The microsensor yields a sensitivity of ̴2.9 THz/RIUand 1.8 × 10–3 THz/°C. This multiparameter high sensitivity microsensor may find important applications in medical sensing, biosensing and on-chip sensing working in terahertz region.
    Źródło:
    Optica Applicata; 2019, 49, 4; 585-596
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active control of terahertz wave assisted by dielectric loaded plasmonic waveguide
    Autorzy:
    Liu, Huaiqing
    Yang, Mengya
    He, Xue
    Jiang, Youchao
    Zhou, Xiancun
    Fu, Maosheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2060683.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    terahertz
    plasmonic
    coupling
    switch
    splitter
    Opis:
    We propose and numerically investigate a directional coupler which consists of two dielectric loaded InSb based terahertz (THz) plasmonic waveguides. Owing to the permittivitly tunable property of InSb, the coupling strength between the two dielectric loaded plasmonic waveguides is affected by temperature, so the maximum power coupled from the input waveguide to the cross-waveguide and the correspondingly coupling length could be effectively tailored by altering temperature. Under different temperatures, this directional coupler could act as a thermally controlled terahertz wave switch or a 3-dB terahertz splitter around the frequency of 1.17 THz. This ultracompact and thermally controlled plasmonic directional coupler may find potential important applications in the highly integrated photonic circuits for terahertz system and technologies.
    Źródło:
    Optica Applicata; 2022, 52, 1; 89--99
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optyczne własności nanokompozytów otrzymywanych metodą mikrowyciągania na bazie szkła NBP i domieszkowanych nanocząstkami Ag i jonami Er3+
    Optical features of nanocomposites obtained by micro-pulling method based on NBP glass containing Er3+ and silver nanoparticles
    Autorzy:
    Surma, B.
    Gajc, M.
    Pawlak, D. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/192287.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    nanokompozyty
    plazmonika
    emisja
    absorpcja
    nanocomposites
    plasmonic
    emission
    absorption
    Opis:
    Opracowano technologię otrzymywania włókien szklanych z Na5B2P3O13 (NBP) oraz włókien NBP domieszkowanych nanocząstkami srebra i jonami Er3+ (NBP_Er3_nAg) przy użyciu metody mikrowyciągania. Metoda ta jest interesująca ze względu na możliwość uzyskania trwałych nanokompozytowych struktur 3D. Zbadano własności optyczne otrzymanych struktur. W czystym NBP obserwowano przesunięcie krawędzi absorpcji w kierunku długofalowym (do ~ 250 nm), który wiązany jest ze wzrostem zasadowości optycznej szkła wskutek zmiany wzajemnego stosunku niemostkowanych do zmostkowanych jonów tlenu. W strukturach NBP_Er3_nAg wzbudzanych linią 325 nm lasera He-Cd obserwowano transfer energii z widma emisyjnego szkła NBP do jonów Er3+ i nanocząstek srebra. Stwierdzono około dwukrotny wzrost emisji dla przejść 4I13/2-4I15/2 w obecności nanocząstek Ag w wyniku transferu energii z nAg do jonów Er3+ . Po raz pierwszy zaobserwowano również w 300K emisję przy 615 nm pochodzącą od przejść 4G11/2-4I11/2 . Ponad pięciokrotne wzmocnienie występuje w obecności silnego piku związanego z LSPR wskutek transferu energii z nanocząstek nAg na poziom 4G11/2 jonu erbu. Przy wzbudzaniu rezonansowym dla przejść 4I15/2-4F7/2 linią 488 nm emisja przy 1532 nm pochodzi głównie od wzbudzenia poziomu 4I13/2 w wyniku relaksacji wielofononowej z poziomu 4F7/2 , a obserwowane gaszenie emisji przy 1532 nm wynika z transferu energii z jonów Er3+ do grupy hydroksylowej OH, transferu pomiędzy jonami erbu oraz transferu do nanocząstek srebra.
    A new technology of the manufacturing of Na5B2P3O13 (NBP) glass fibers doped with erbium ions and silver nanoparticles (nAg) was elaborated by using micro-pulling method (μ - PD). The method is interesting as it allows to obtain the solid and stable 3D nanocomposite structures. The optical features of these structures were studied. A “red shift” of the absorption band gap observed for pure NBP fibers was related to the change in the optical basicity of the glass due to the change in the relation between bridging and non-bridging oxygen. In the plasmonic composite doped with nAg and Er3+ (NBP:Er3:nAg) excited with 325 nm line of He-Cd laser a radiative energy transfer was observed from matrix emission to Er3+ and nAg. Twofold increase of the emission for 4I13/2-4I15/2 transition was stated in presence of nAg. For the first time the emission at 615 nm for 4G11/2 -4I11/2 transitions was observed and more than fivefold increase in the intensity of this line occurred in the presence of the strong local surface plasmon resonance (LSPR) due to energy transfer from nAg. During excitation with 488 nm line the intensity of the emission at 1536 nm (4I13/2-4I15/2 transitions) was mainly controlled by the energy transport from Er3+ ions to hydrocarboxyl group OH as well as energy migration between erbium ions.
    Źródło:
    Materiały Elektroniczne; 2013, T. 41, nr 4, 4; 34-49
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Demonstration of a high extinction ratio TiN-based TM-pass waveguide polarizer
    Autorzy:
    Zhao, Zhuan
    Santi, Giovanni
    Corso, Alain Jody
    Pelizzo, Maria Guglielmina
    Powiązania:
    https://bibliotekanauki.pl/articles/2172856.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasmonic waveguide polarizer
    extinction ratio
    insertion loss
    broadband
    Opis:
    A high extinction ratio transverse magnetic (TM)-pass plasmonic waveguide polarizer has been designed and optimized. This device exploits two parallel TiN strips embedded in a silicon dioxide cladding to cut off the transverse electric (TE) polarization state, which is either reflected or absorbed, while the TM mode can pass through the main silicon waveguide with significant low losses. Given a device of 5 μm length, an extinction ratio as high as 60.7 dB and an insertion loss of 2.23 dB were achieved at the target wavelength of 1.55 μm. To our knowledge, this extinction ratio is one of the highest values ever reported. In the wavelength of 1.45–1.59 μm, the proposed device provides an optical bandwidth of 140 nm for an extinction ratio more than 30 dB and an insertion loss less than 3 dB. This device is relatively simple and is easier to be fabricated than other architectures that are found in the literature.
    Źródło:
    Optica Applicata; 2022, 52, 4; 585--598
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel (Ag,Y) doped TiO2 plasmonic photocatalyst with enhanced photocatalytic activity under visible light
    Autorzy:
    Kallel, Wannes
    Chaabene, Sirine
    Bouattour, Soraa
    Powiązania:
    https://bibliotekanauki.pl/articles/110853.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    XRD
    plasmonic photocatalyst
    Methylene Blue
    visible light
    Opis:
    Nano-sized Y- Ag doped and co-doped TiO2 particles were synthesized using the sol–gel method and Ti(OBu)4 as TiO2 precursor. Their structural and optical properties were examined by scanning electron microscopy (SEM), XRD, thermogravimetric-differential thermal analysis (TG-DTA), FT-IR and UV-vis absorption spectroscopies. The photocatalytic activity of these materials was investigated for the photodegradation of methylene blue (MB) as a model reaction under visible light irradiation. Ground state diffuse reflectance absorption studies reveal that both Y and Ag dopant cause deviations of the band gap to higher energies attesting that co-doping the TiO2 with Y and Ag could enhance the photocatalytic activity by delaying the electron–hole recombination by means of higher energy band gaps. Co-doping TiO2 at a level of 4% (Y, Ag) samples leads to a significant decrease in the crystallite size of photocatalyst and containing both anatase and Ag/AgCl components. However, the high photocatalytic performance is attributed to an efficient electron-hole pairs separation at the photocatalyst interfaces in addition to localized surface plasmon resonance of Ag particles. The development of these visible light- activated nanocatalysts has the potential of providing environmentally benign routes for water treatment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 3; 745-759
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement Optical and Electrical Characteristics of Thin Film Solar Cells Using Nanotechnology Techniques
    Autorzy:
    Thabet, Ahmed
    Abdelhady, Safaa
    Ebnalwaled, A.A.
    Ibrahim, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226062.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin film
    nanoparticles
    nanocomposites
    energy conversion
    optical
    plasmonic
    solar cells
    Opis:
    This work presents a theoretical study for the distribution of nanocomposite structure of plasmonic thin-film solar cells through the absorber layers. It can be reduced the material consumption and the cost of solar cell. Adding nanometallic fillers in the absorber layer has been improved optical, electrical characteristics and efficiency of traditional thin film solar cells (ITO /CdS/PbS/Al and SnO2/CdS/CdTe/Cu) models that using sub micro absorber layer. Also, this paper explains analysis of J-V, P-V and external quantum efficiency characteristics for nanocomposites thin film solar cell performance. Also, this paper presents the effect of increasing the concentration of nanofillers on the absorption, energy band gap and electron-hole generation rate of absorber layers and the effect of volume fraction on the energy conversion efficiency, fill factor, space charge region of the nanocomposites solar cells.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 625-634
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przegląd metod otrzymywania materiałów plazmonicznych oraz wybranych alternatywnych materiałów
    Overview of fabrication methods of plasmonic materials and selected alternative materials for plasmonic applications
    Autorzy:
    Korzeb, K.
    Gajc, M.
    Pawlak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/192201.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    plazmonika
    materiał plazmoniczny
    top-down
    bottom-up
    plasmonics
    plasmonic materials
    Opis:
    Praca przedstawia przegląd literaturowy dotyczący technologii otrzymywania materiałów plazmonicznych oraz propozycji materiałów alternatywnych do obecnie stosowanych materiałów w obszarze plazmoniki. W analizie literaturowej przedstawiono porównanie metod top-down i bottom-up do otrzymywania materiałów plazmonicznych w postaci warstw, jak również jako materiałów objętościowych. Dodatkowo wybrano potencjalnie najkorzystniejsze alternatywne materiały plazmoniczne, które mogą zastąpić współcześnie używane materiały konwencjonalne stosowane w dziedzinie plazmoniki.
    In this work we reviewed the fabrication methods of both plasmonic materials and novel alternative materials for plasmonics. The analysis of the literature enabled a comparison of 'top-down' and 'bottom-up' preparation methods of plasmonic materials, in the form of layers as well as bulk materials. In addition, potentially the best alternative plasmonic materials which can replace conventional materials for plasmonics are proposed.
    Źródło:
    Materiały Elektroniczne; 2014, T. 42, nr 2, 2; 18-29
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual-band absorption of a GaAs thin-film solar cell using a bilayer nano-antenna structure
    Autorzy:
    Khalaf, A. A. M.
    Gaballa, M. D
    Powiązania:
    https://bibliotekanauki.pl/articles/1818246.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    dual absorption band
    light trapping
    plasmonic solar cell
    nanoantenna
    nanoparticles
    Opis:
    The paper presents a dual-band plasmonic solar cell. The proposed unit structure gathers two layers, each layer consists of a silver nanoparticle deposited on a GaAs substrate and covered with an ITO layer, It reveals two discrete absorption bands in the infra-red part of the solar spectrum. Nanoparticle structures have been used for light-trapping to increase the absorption of plasmonic solar cells. By proper engineering of these structures, resonance frequencies and absorption coefficients can be controlled as it will be elucidated. The simulation results are achieved using CST Microwave Studio through the finite element method. The results indicate that this proposed dual-band plasmonic solar cell exhibits an absorption bandwidth, defined as the full width at half maximum, reaches 71 nm. Moreover, It can be noticed that by controlling the nanoparticle height above the GaAs substrate, the absorption peak can be increased to reach 0.77.
    Źródło:
    Opto-Electronics Review; 2020, 28, 3; 171--175
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the current state-of-the-art in Fano resonance-based plasmonic metal-insulator-metal waveguides for sensing applications
    Autorzy:
    Adhikari, R.
    Chauhan, D.
    Mola, G. T.
    Dwivedi, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063886.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    coupled resonator
    Fano resonance
    finite element method
    plasmonic nanosensor
    sensitivity
    waveguide
    Opis:
    Fano resonance is an optical effect that emerges from the coherent coupling and interference (constructive and destructive) between the continuous state (background process) and the Lorentzian state (resonant process) in the plasmonic waveguide-resonator system. This effect has been used in the applications like optical sensors. These sensors are extensively used in sensing biochemicals and gases by the measurement of refractive index changes as they offer high sensitivity and ultra-high figure of merit. Herein, we surveyed several plasmonic Fano sensors with different geometries composed of metal-insulator-metal waveguide(s). First, the resonators are categorized based on different architectures. The materials and methods adopted for these designs are precisely surveyed and presented. The performances are compared depending upon the characterization parameters like sensitivity and figure of merit. Finally, based on the survey of very recent models, the advances and challenges of refractive index sensing deployed on Fano resonances are discussed.
    Źródło:
    Opto-Electronics Review; 2021, 29, 4; 148--166
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diminutive left-handed plasmonic nanoantenna-lens system in optical realm: ultraviolet emission and flat lens application
    Autorzy:
    Rajput, Monika
    Dabas, Bhawana
    Saini, Than Singh
    Mehta, Neeru
    Powiązania:
    https://bibliotekanauki.pl/articles/174455.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    left-handed materials
    negative refraction
    plasmonic optical nanoantenna
    second harmonic generation
    flat lens
    Opis:
    In present paper, a tunable left-handed plasmonic nanoantenna is designed to attain ultraviolet emission through a second harmonic generation with a phase harmonic condition. For the devised structure, the dispersion properties and negative values of the magnetic permeability and the electric permittivity show that the designed structure is left-handed for the primary wave (red light) and right-handed for the second harmonic wave (ultraviolet light). The 3D finite-difference time-domain method is employed to reveal its nonpareil skills (i.e. immense left-handed transmission efficiency and far-field spectrum exhibiting directionality). Attained results by numerical calculation for the second harmonic generation are accomplished with finite-difference time-domain analysis. The impact of physical parameters on transmission and dispersion characteristics is also scrutinized. Furthermore, flat lens application for a red light region with a centered wavelength at λ = 650 nm from the guileless design of LHM with no aberration is triumphed. Ultimately, a multifunction left-handed material is designed revealing tremendous potential to amass and abridge future applications in one architecture.
    Źródło:
    Optica Applicata; 2019, 49, 4; 679-692
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanoblocks embedded in L-shaped nanocavity of a plasmonic sensor for best sensor performance
    Autorzy:
    Butt, M. A.
    Kazanskiy, N. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1835766.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasmonic sensor
    refractive index sensor
    metal-insulator-metal waveguide
    L-shaped cavity
    finite element method
    Opis:
    In this work, we proposed a highly sensitive design of a plasmonic sensor which is formed by embedding a periodic array of nanoblocks in L-shaped cavity formed by the metal–insulator–metal waveguide. The nanoblocks are placed in the strong electric field confinement region to further enhance its strength by confining it to a small area. To validate the study, the spectral characteristics of the proposed sensor design is compared to the spectral characteristics of a standard design having the same geometric parameters excluding nanoblocks in the cavity. The study shows that the incorporation of 5 nanoblocks of length 25 nm in the cavity can provide best performance indicators in the form of sensitivity, figure of merit and Q-factor. The sensitivity, figure of merit and Q-factor of the proposed sensor design is 1065 nm/RIU, 251.17 and 343.4 which is significantly higher than the standard L-shape resonator design. The sensor design can be developed with a single fabrication step. Due to the ease of fabrication and the highly responsive nature of the design, it can be used in biomedical applications.
    Źródło:
    Optica Applicata; 2021, 51, 1; 109-120
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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