Nicoleta Eseanu

Publications (17) View all

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  Available from: Nicoleta Eseanu

  Chapter: Intersubband and Interband Absorptions in Near-Surface Quantum Wells Under Intense Laser Field

  Nicoleta Eseanu
  10/2011; , ISBN: 978-953-307-576-1
• Article: Intense laser field effect on the interband absorption in differently shaped near-surface quantum wells

  Nicoleta Eseanu
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  ABSTRACT: The 1S-exciton properties and interband absorption spectra in differently shaped near-surface quantum wells (NSQWs) with symmetrical/asymmetrical barriers, under intense laser field, are investigated taking into account the correct dressing effect for the confinement potential and electrostatic interaction between carriers and their image-charges. We found that: i) the 1S-exciton binding energy is significantly reduced by the laser intensity in InGaAs NSQWs of different asymmetrical shape; ii) the red-shift of the absorption peak induced by the asymmetry diminution or by increasing cap layer thickness can be effectively compensated using the blue-shift caused by enhancing laser parameter. Therefore, the optical properties of the differently shaped NSQWs could be tuned by proper tailoring of the heterostructure parameters (well shape, barrier asymmetry) and/or dielectric mismatch as well as by varying the laser field intensity.
  Physics Letters A.
• Article: Simultaneous effects of laser field and hydrostatic pressure on the intersubband transitions in square and parabolic quantum wells

  N. Eseanu
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  ABSTRACT: The intersubband transitions in square and parabolic quantum wells under simultaneous action of the hydrostatic pressure and high-frequency laser field have been investigated. We found that the laser-induced blueshift effect on the subband energy levels may be tuned by the pressure action. Our calculations revealed that the oscillator strength of the transition between the ground and the first excited levels depends on the quantum well width and shape, laser field intensity and hydrostatic pressure. This combined effect of pressure and laser field offers a new degree of freedom in the optoelectronic devices applications.
  Physics Letters A.
• Article: Hydrostatic pressure and electric field effects on the normalized binding energy in asymmetrical quantum wells

  E. C. Niculescu, N. Eseanu
  http://dx.doi.org/10.1140/epjb/e2010-00149-7.
• Article: Simultaneous effects of pressure and laser field on donors in GaAs/Ga1−xAlxAs quantum wells

  N. Eseanu, E.C. Niculescu, L.M. Burileanu
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  ABSTRACT: Within the framework of effective-mass approximation, using a variational method, the combined effect of the hydrostatic pressure and high-frequency laser field on the binding energy of a hydrogenic impurity in square and parabolic GaAs/Ga1−xAlxAs quantum wells is investigated. Our numerical results show that the effects of the laser field on the electronic properties are more pronounced than those of the pressure ones, and the changes in the binding energy are dependent on the shape of the confinement potential. The variations of the impurity binding energy in intense laser fields can be tuned by the hydrostatic pressure.
  Physica E: Low-dimensional Systems and Nanostructures.