Opt Quant Electron (2018) 50:250
https://doi.org/10.1007/s11082-018-1497-x
1 3
Optical rectification coefficient in an oxide quantum dot
with different confinement potentials
A. John Peter
1
· N. Karthikeyan
2
· Chang Woo Woo
3
Received: 10 February 2018 / Accepted: 9 May 2018
© Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract Exciton binding energies, oscillator strength, optical rectification coefficients
and second harmonic generation are investigated using three different confinement poten-
tials in a CdO/ZnO core/shell quantum dot. The bare potential, Smorodinsky–Winternitz
potential and Woods–Saxon potential are employed in the Hamiltonian. The position
dependent dielectric function is used. The electronic properties are found using variational
formulism within a single band effective mass approximation whereas the optic properties
are investigated using compact density matrix approach. The results show that different
confinement potentials lead to significant changes in the coefficients of optical rectifica-
tion and the second harmonic generations and the effects of confined potentials are more
pronounced in the strong confinement region. The resonant peaks in the nonlinear optical
rectification coefficients and second harmonic generation are blue shifted to larger photon
energies with the various confined potentials and the results are enhanced using Smorodin-
sky–Winternitz potential. The obtained results can be applied for the potential applications
for fabricating opto-electronic devices.
Keywords Exciton · Quantum dot · Optical rectification
1 Introduction
Semiconductor nano-heterostructures are given attention owing to the observation of
unique physical and chemical properties at the nano-level compared with their counter part
bulk materials. Group II–VI wide band gap oxide semiconductors are attractive due to the
* A. John Peter
a.john.peter@gmail.com
1
Department of Physics, Government Arts College, Melur, Madurai 625 106, India
2
Department of Physics, Ramco Institute of Technology, Rajapalayam 626117, India
3
Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732
Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, South Korea
@Phil_Robichaud
@deepthiw
@JoseServera