Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
72 (1992), S. 904-914
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The ultrasonic excitation and propagation in an acoustic superlattice made of a LiNbO3 crystal is studied. Some interesting phenomena are predicted theoretically. The resonance is determined by the periodicity of the acoustic superlattice (ASL). The acoustic power emitted by the ASL into the transmission medium is directly proportional to N2 (N is the number of domains of the ASL). In view of these two features, the ASL may have potential applications in acoustic devices operating at frequencies of several hundred megahertz to several gigahertz. Another interesting phenomenon is the existence of a satellitelike resonance, whose frequency is related to the total thickness of the ASL. Using the ASL, resonators and transducers have been fabricated with operating frequencies in the range of 500–1000 MHz. Satellitelike resonances have been observed. Transducers with a very low insertion loss at 555 MHz and a 5.8% 3 dB bandwidth have been fabricated. The experiments basically confirm the theoretical predictions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.351766
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