Title :
Second-harmonic generation from CuInSe2 thin films: influence of the substrate-epilayer lattice mismatch
Author :
Bottomley, D.J. ; Mito, A. ; Fons, P.J. ; Niki, S. ; Yamada, A.
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
8/1/1997 12:00:00 AM
Abstract :
We investigate the second-order nonlinear optical (NLO) properties of tetragonal chalcopyrite-structure CuInSe2 thin films using optical second-harmonic generation at a fundamental wavelength of 790 nm. An approximate doubling of the second-order optical nonlinearity of the CuInSe2 thin films is achieved through changing the substrate from GaAs(001) to In0.29Ga0.71As(001), thereby reducing the lattice mismatch from 2.2% to 0.2%. This observation suggests that minimizing the lattice mismatch is a key requirement for the growth of high-quality NLO active chalcopyrite structure thin films and is in contrast to some other NLO active thin-film systems
Keywords :
copper compounds; epitaxial growth; optical films; optical harmonic generation; semiconductor growth; semiconductor thin films; ternary semiconductors; 790 nm; CuInSe2; CuInSe2 thin films; GaAs(001); In0.29Ga0.71As(001); NLO active thin-film systems; fundamental wavelength; high-quality NLO active chalcopyrite structure thin film growth; lattice mismatch; optical second-harmonic generation; second-harmonic generation; second-order nonlinear optical properties; second-order optical nonlinearity; substrate; substrate-epilayer lattice mismatch; tetragonal chalcopyrite-structure CuInSe2 thin films; Frequency; Laboratories; Lattices; Nonlinear optics; Optical films; Optical waveguides; Semiconductor materials; Semiconductor thin films; Semiconductor waveguides; Transistors;
Journal_Title :
Quantum Electronics, IEEE Journal of
