Linear and nonlinear optical phenomena in quantum dot (QD) systems caused by interlevel transitions are investigated theoretically. The electron-electron (e-e) interaction is taken into account by employing the self-consistent field approach in the quasistatic limit. It is shown that presence of metal surface, and especially another resonant system, can dramatically enhance the effect of the e-e interaction on the optical phenomena. The conditions for the intrinsic optical bistability in QD systems caused by the e-e interaction are discussed. The obtained results can find applications for designing, manufacturing, and exploiting nanooptoelectronics devices, in part, all-optical components like QD-based optical switches and optical transistors.
Infrared interlevel electromagnetic response of different quantum
dot (QD) systems is investigated theoretically within the
self-consistent field approach. Individual QDs as well as lattices
of QDs electromagnetically interacting are considered. The Coulomb
interaction in the QD systems is shown to essentially affect the
optical spectra of the systems. Systems of QDs with uniaxial
rotation symmetry are considered. It is shown that the shape of QD
can dramatically affect the spectra, in particular, depending on
the polarization of incident radiation and number of electrons in
the dot. It is shown that the Coulomb interaction in the QD
systems causes the depolarization shift of the peak(s) in the
spectra, can affect the peak(s) height, and cause the peak split.
It is numerically established that the approximation of the point
dipole-dipole interaction can be used for adequate representation
of the effect of the dynamic interdot electron-electron
interaction on the spectra of the considered QD lattices. It
is found that the effects of the intradot and interdot Coulomb
interactions on the response can be analyzed separately. Effect of
the intradot electron-electron interaction on the spectra is
considered for different QD sizes and shapes. Illustrative maps of
the interlevel transitions are utilized to facilitate application
of the approach of the modified oscillator strength for
reproducing the absorption spectra of the considered QD
systems with interacting modes of the collective excitation. The
results obtained can be useful for designing nanooptoelectronics
devises based on the QDs, and engineering composite materials
including the QDs with predermined optical properties.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.