An exemplary surface acoustic wave device includes a DLC film, a zinc oxide film formed on the DLC film, and at least one interdigital transducer formed on the zinc oxide film. The DLC film has a nano-sized thickness Z(f), corresponding to the surface acoustic wave device having an operational frequency f ranging from 20 to 1,000 GHz, satisfying the condition (1): Z(f)=MxZ0/(f/f0), and Z(f)>=1 nanometer. The zinc oxide film has a nano-sized thickness Y(f), corresponding to the surface acoustic wave device having the operational frequency f, satisfying the condition (2): Y(f)=NxY0/(f/f0). The Z0 and Y0 respectively are the thicknesses of the DLC film and the zinc oxide film corresponding to an operational frequency f0 of the surface acoustic wave device.
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Ga-Lane Chen (2009) studied this question.
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