Title :
SAW and AO propagation characteristics of KNbO/sub 3//spinel thin film layered structure
Author :
Nayak, Ranu ; Gupta, Vinay ; Sreenivas, K.
Author_Institution :
Dept. of Phys. & Astrophys., Delhi Univ., India
Abstract :
SAW and acousto-optic (AO) properties has been investigated theoretically in a KNbO3(001)/spinel thin film structure. A significant enhancement in the coupling coefficient (k2) value has been observed in the spinel (0.5 μm)/KNbO3(1.0 μm)/spinel structure from 8.8% to 23.5% with the introduction of a spinel overlayer. Diffraction efficiency variation in the symmetric (spinel/KNbO3/spinel) and asymmetric (KNbO3/spinel) waveguide structures have been studied in detail. A high value of k2=23.5% with 50% diffraction efficiency has been obtained for the spinel(0.5 μm)/KNbO3(1.0 μm)/spinel structure for a device operating at 1 GHz SAW frequency and 633 nm optical wavelength at a low input drive power of 15.4 mW
Keywords :
Rayleigh waves; acousto-optical effects; optical waveguides; piezoceramics; piezoelectric thin films; potassium compounds; surface acoustic waves; 0.5 micron; 1 GHz; 1.0 micron; 15.4 mW; 633 nm; AO propagation characteristics; KNbO/sub 3/; KNbO/sub 3//spinel thin film layered structure; Rayleigh wave propagation; SAW; acousto-optic properties; asymmetric waveguide structures; coupling coefficient; diffraction efficiency variation; piezoelectric materials; spinel overlayer; symmetric waveguide structures; Diffraction; Frequency; Nonlinear optical devices; Nonlinear optics; Optical devices; Optical films; Optical waveguides; Substrates; Surface acoustic waves; Transistors;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991624
