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    Wyświetlanie 1-4 z 4
    Tytuł:
    Electromagnetically induced transparency in systems with degenerate autoionizing levels in Λ-configuration
    Autorzy:
    Dinh, T. B.
    Leoński, W.
    Perina, J.
    Long, V. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/174175.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electromagnetically induced transparency
    electromagnetically induced transparency (EIT)
    lambda configuration
    autoionizing states
    double Fano profile
    Opis:
    We discuss a Λ-like model of atomic levels involving two autoionizing (AI) states of the same energy. The system is irradiated by two external electromagnetic fields (strong – driving and weak – probing). For such a system containing degenerate AI levels we derive the analytical formula describing the medium susceptibility. We show that the presence of the second AI level leads to the additional electromagnetically induced transparency (EIT) window appearance. We show that the characteristics of this window can be manipulated by changes of the parameters describing the interactions of AI levels with other ones. This is a new mechanism which leads to additional transparency windows in EIT model, that differs from the mechanism where a bigger number of Zeeman sublevels is taken into account.
    Źródło:
    Optica Applicata; 2013, 43, 3; 471-484
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double tunneling induced transparency in the asymmetry quantum dot molecules
    Autorzy:
    Yu, C.
    Huang, H.
    Zhang, L.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/173599.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quantum dot molecule
    slow light
    tunneling induced transparency
    Opis:
    Using the density matrix theory, we have studied the double tunneling induced transparency slow light in the double asymmetry quantum dot molecules. With applied electric field, double tunneling induced transparency occur in the same time. Four absorption peaks are found near the resonance energy level in the absorption spectrum and the absorption peak can be tuned by the applied electric field. The velocity and bandwidth of the multiple-windows slow light can also be controlled by the applied electric field. In our model, with Te =0.1meV, we can get about 0.001c and 20GHz bandwidth in each transparency window. Such a property may be applied in all optical buffers, optical switching and filter.
    Źródło:
    Optica Applicata; 2016, 46, 3; 473-481
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetically induced transparency for A-like systems with degenerate autoionizing levels and a broadband coupling laser
    Autorzy:
    Khoa, D. Q.
    Van, C. L.
    Lanh, C. V.
    Phuc, H. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/173807.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electromagnetically induced transparency
    autoionizing states
    lambda configuration
    white noise
    Opis:
    In our previous paper (DOAN QUOC K. et al., Physica Scripta T147, 2012, article 014008), electromagnetically induced transparency for A-like systems consisting of two lower bound states and a flat continuum coupled to an autoionization state embedded in it has been considered, in which the laser coupling light is modeled by white noise. In this paper, we investigate a similar scheme, where the continuum involved in the problem is replaced by one with so-called the double-A system, when instead of one autoionization state we have two autoionization states of the same energy embedded in the continuum. For such a system containing degenerate autoionization levels we derive a set of coupled stochastic integro-differential equations which can be averaged exactly. This leads to the exact formula determining the stationary solution for the electric susceptibility. Dispersion and absorption spectra for electromagnetically induced transparency are found and compared with those obtained previously by us and other authors.
    Źródło:
    Optica Applicata; 2016, 46, 1; 93-102
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of spontaneously generated coherence and phase of laser fields on optical bistability in a three-level atomic medium: an analytical approach
    Autorzy:
    Van, Doai Le
    Minh, Phuong Le Thi
    Tien, Dung Nguyen
    Xuan, Khoa Dinh
    Huy, Bang Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/174730.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical bistability
    electromagnetically induced transparency
    spontaneously generated coherence
    Opis:
    The influence of spontaneously generated coherence and relative phase of laser fields on optical bistability in a three-level atomic medium under electromagnetically induced transparency was studied by using a density matrix theory. An input-output intensity relation of a probe laser field is derived as an analytical function of parameters of a controlling light field, the relative phase, and the spontaneously generated coherence. This function can be fitted with experimental values to be a semi-empirical model which is helpful for finding related applications. It is shown that thresholds and width of the optical bistability hysteresis loop can be manipulated with the controllable parameters. On the other hand, the influence of population relaxation between two ground hyperfine levels on the optical bistability behavior is significant for small coupling field intensity.
    Źródło:
    Optica Applicata; 2019, 49, 3; 509-522
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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