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    Wyświetlanie 1-4 z 4
    Tytuł:
    Tuning of suitable solar spectrum onto photocatalytic materials of the matched band gap using optical engineering
    Autorzy:
    Ranjan, R
    Ghosh, A
    Nirala, A K
    Yadav, H L
    Powiązania:
    https://bibliotekanauki.pl/articles/174130.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photocatalytic materials
    holographic concentrator
    diffraction efficiency
    solar spectrum
    Opis:
    In this report, we have carried out work on the concept of optical engineering for tuning solar spectrum onto photocatalytic materials of the matched band gap using a holographic concentrator. Processing parameters of holographic concentrators have been designed suitably to have a control over the desired wavelength range for photocatalytic materials of the matched band gap.
    Źródło:
    Optica Applicata; 2015, 45, 2; 237-247
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the characteristics of Klein–Cook parameter and diffraction efficiency of acousto-optic interaction for low-frequency ultrasonic in the liquid
    Autorzy:
    Gao, Jing
    Han, Guang
    Zhu, Jianzhuo
    Powiązania:
    https://bibliotekanauki.pl/articles/2033941.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    acousto-optic interaction
    Klein-Cook parameter
    Raman-Nath diffraction
    diffraction efficiency
    Opis:
    We have investigated the characteristics of acousto-optic interaction for low-frequency ultrasonic wave in a liquid. Based on the coupling wave equation of acousto-optic interaction, the diffraction light characteristics for normal incidence at small parameter Q have been discussed. The parameter Q with respect to acousto-optic interaction length, ultrasonic frequency, water temperature, and the concentration of sucrose solution have been analyzed, which is an important physical quantity and reflects the degree of mismatch in the acousto-optic interaction. The diffraction efficiencies for different parameters Q, incident angles and phase shifts have been calculated. The results of our work provide theoretical basis for further study of the acousto-optic effect in the liquid.
    Źródło:
    Optica Applicata; 2021, 51, 3; 445-456
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of coating fabrication processes on the optical efficiency of replicated Moiré diffraction gratings
    Autorzy:
    Ribeiro, J. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/220824.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diffraction gratings
    Moiré interferometry
    gratings replication
    optical efficiency
    Opis:
    One of the most important parameters in the study of diffraction gratings is their optical efficiency. This paper analyzes the different manufacturing processes to cover gratings of Moiré interferometry and their influence on the quality and absolute efficiency of replicated gratings on the surfaces of specimens. The Moiré interferometry is a field measurement technique that has been used in many different fields such as applied mechanics, microelectronics, biomechanics or micromechanics, hence the importance of this study. The applied reflected coating was done by sputtering and aluminium vaporization processes. In this work different materials and thickness layers were analyzed. The obtained coatings have a high degree of reflectivity on the replicated gratings.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 119-126
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel trapezoidal profile of optimized diffraction grating for light trapping in thin silicon solar cells
    Autorzy:
    Dehdast, M.
    Bahrami, A.
    Mohammadnejad, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/174344.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diffraction grating
    light trapping
    quantum efficiency
    solar cell
    Opis:
    In this paper, we propose a new design and comprehensive optimization process for improving the diffraction gratings used as the back reflector of silicon solar cells. For this process, the optimum refractive index and its corresponding available material which can be used as the grating material has been chosen as 1.57 and SiO2, respectively. Also, all of geometric parameters which affect the performance of the grating, such as periodicity, height and depth of grating profiles have been studied and the appropriate values for each of them have been proposed. In order to optimize the profile of grating, a transition from triangular to rectangular structure has been considered and finally a specific trapezoidal profile has been chosen as the optimized grating back reflector which enhances the cell efficiency up to 6%. Simulation results show that the different grating profiles have the same duty cycle and therefore use the same amounts of materials.
    Źródło:
    Optica Applicata; 2017, 47, 1; 75-83
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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