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Träfflista för sökning "WAKA:ref ;pers:(Fu Ying);pers:(Andersson J. Y.)"

Sökning: WAKA:ref > Fu Ying > Andersson J. Y.

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1.
  • Fu, Ying, et al. (författare)
  • Optical reflection from excitonic quantum-dot multilayer structures
  • 2008
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 93:18, s. 183117
  • Tidskriftsartikel (refereegranskat)abstract
    • We study theoretically and experimentally the optical reflection from excitonic quantum-dot (QD) multilayer structures composed of InAs QDs in a GaAs substrate. Quantum mechanical and finite-difference time-domain numerical calculations indicate that the incident radiation in the optical reflectance measurement photoexcites the InAs QDs which then form excitonic dipoles. The excitonic dipole modifies significantly the dielectric constant of the QD, which results in a reflectance peak in the vicinity of the excitonic energy, as observed experimentally.
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2.
  • Hellström, Staffan, et al. (författare)
  • Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film
  • 2010
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 96:23, s. 231110
  • Tidskriftsartikel (refereegranskat)abstract
    • Photocurrent enhancement in quantum dot (QD) infrared photodetector (QDIP) with an optical grating of subwavelength hole array in a thin metal film has been studied by calculating the transmission and diffraction of the infrared optical field through the grating and the light-matter interaction between the transmitted optical field and electrons confined in the QD. It is shown that due to the small aspect ratio of realistic QDs in QDIPs, the light diffraction due to the surface plasmon effect at the metal-semiconductor surface and the photonic subwavelength hole array structure is dominant in increasing the photocurrent.
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