The one-dimensional Cu–O chains responsible for the large optical nonlinearity in (SCO) and (CCO) are aligned in one direction in films grown on (LSAO) (1 0 0) substrates by using pulsed laser deposition. The CCO films deposited directly on lattice matched LSAO substrates have a single orientation with high crystallinity, while the SCO films include small portions of misoriented domains. Using a simple model of lattice mismatch, we developed a buffer layer in order to grow orientation-controlled SCO films with both high crystallinity and a sharp optical absorption edge. This technique will be a key to fabricating ultrafast all-optical switches with a waveguide structure.
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© 2001 American Institute of Physics.
2001
American Institute of Physics
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