The technology realizing two multi-scale structures on piezoelectric single crystal lithium niobate plate was developed. The system of interdigital electrodes for the acoustic delay line operating at the range 2-3 MHz was produced by using photolithography. This delay line was combined with the nanotransduces having size about 60-80 nm. These transducers were produced by using negative electron-beam nanolithography.
The reflection of ultrasonic Lamb waves produced by a periodic array of thin conducting or mass loading strips is investigated both theoretically as well as experimentally. A repetitively mismatched transmission line model is used to analyze the performance of the reflector. It is found that Lamb waves propagating in thin elastic plates can be reflected much more efficiently than surface acoustic waves (SAWs). Efficient reflectors can therefore be realized with relatively few strips in the array. The characteristics of a number of reflectors fabricated on thin plates of lithium niobate have been evaluated and found to be in good agreement with theory. The reflectors have been used to realize various useful devices such as unidirectional transducers, low loss, wide bandwidth delay lines, and Lamb wave resonators.
KEYWORDS: Transducers, Microwave radiation, Sensors, Acoustics, Dielectrics, Electric field sensors, Signal attenuation, Extremely high frequency, Interference (communication), Complex systems
The microwave electric field strength sensor of single powerful radio pulses is described. Dielectric acoustic line of the surface acoustic wave (SAW) is used which has the nonlinear electroacoustic properties and involves two transducers. The first (nonlinear) transducer is affected by the microwave electric field and excits the SAW due to nonlinear effects. Delayed SAW signal, carrying information about the electric field strength, is received by a linear interdigital transducer.
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