Thermal tuning of phononic bandstructure in ferroelectric ceramic/epoxy phononic crystal

Jim, K. L.; Leung, C. W.; Lau, S. T.; Choy, S. H.; Chan, H. L. W.
May 2009
Applied Physics Letters;5/11/2009, Vol. 94 Issue 19, p193501
Academic Journal
Thermal tuning of phononic bandgaps in megahertz range was demonstrated in ferroelectric ceramic-based phononic crystal structure. Temperature variation across ferroelectric phase transition, accompanied by substantial changes in acoustic velocities, leads to a shift in the phononic bandstructure of a two-dimensional (Ba,Sr)TiO3/epoxy composite sample over a range of 10 °C. Experimental results are supported by modelings based on plane-wave expansion calculations. The high tunability of phononic bandstructure is advantageous for active control of ultrasound transmissions.


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