Quadrupole second harmonic generation and sum-frequency generation in ZnO quantum dots

Journal Article · Wed Apr 15 04:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4917494· OSTI ID:22488531

Maikhuri, Deepti; Mathur, K. C. ^[1]

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1. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, U.P. 201307 (India)

The second harmonic generation (SHG) and the sum frequency generation (SFG) processes are investigated in the conduction band states of the singly charged ZnO quantum dot (QD) embedded in the HfO{sub 2}, and the AlN matrices. With two optical fields of frequency ω{sub p} and ω{sub q} incident on the dot, we study the variation with frequency of the second order nonlinear polarization resulting in SHG and SFG, through the electric dipole and the electric quadrupole interactions of the pump fields with the electron in the dot. We obtain enhanced value of the second order nonlinear susceptibility in the dot compared to the bulk. The effective mass approximation with the finite confining barrier is used for obtaining the energy and wavefunctions of the quantized confined states of the electron in the conduction band of the dot. Our results show that both the SHG and SFG processes depend on the dot size, the surrounding matrix and the polarization states of the pump beams.

• OSTI ID: 22488531
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 4 Vol. 5; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM NITRIDES
COMPARATIVE EVALUATIONS
EFFECTIVE MASS
ELECTRIC DIPOLES
ELECTRONS
HAFNIUM OXIDES
HARMONIC GENERATION
INTERACTIONS
POLARIZATION
PUMPS
QUANTUM DOTS
ZINC OXIDES