Surface acoustic wave device and design method thereof

Abstract

The invention provides a surface acoustic wave device, which comprises a substrate, a first transducer, a second transducer and an acoustic wave focusing device, and is characterized in that the acoustic wave focusing device is arranged on the substrate and is used for focusing an acoustic signal output by the first transducer and transmitted by the substrate, regulating and controlling the acoustic signal and outputting the acoustic signal to the second transducer through the substrate. The invention provides a design method of the surface acoustic wave device. The surface acoustic wave device based on an acoustic microstructure can gather and absorb sound waves with specific frequency, meanwhile, the characteristics of a formed sound field are obviously superior to those of a common surface acoustic wave device, and the local focusing phenomenon which is difficult to achieve by a traditional surface acoustic wave device is achieved. the acoustic surface wave device organically combined with the acoustic structure can effectively regulate and control the formed sound field, the limitation of a single sound field of a traditional acoustic surface wave device can be broken through,and the acoustic surface wave device has great practical significance in application of related fields such as micro-fluidic control.

Description

technical field [0001] The invention relates to a design method of a surface acoustic wave device based on a double-layer columnar microstructure, and relates to the field of artificial acoustic microstructure design. Background technique [0002] Artificial acoustic microstructures (including acoustic metamaterials) are one of the frontier research hotspots in physics in recent years. The novel propagation law in acoustic microstructures has opened up new ideas for the study of arbitrary frequency regulation of acoustic signals, which also shows a bright prospect for SAW devices in multifunctional and multiscale microfluidic applications. For example, the adjustable characteristics of the internal sound field of surface acoustic wave devices are used in particle shunting, cell sorting and other fields. Due to its intrinsic vibration characteristics and resonance mechanism, the local resonance type acoustic columnar microstructure can achieve single-focus focusing and multi...

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Problems solved by technology

[0004] Although there are many research results on artificial acoustic ultrastructure (metamaterials) in recent years, there is a lack of application research specific to a certain field.

Phononic crystals are the most typical artificial acoustic metamaterials. The main structure of current phononic crystal research is mainly reflected in the implementation of one-dimensional and two-dimensional phononic crystal models under the condition of infinite length, and the three-dimensional phononic crystal model is implemented at low frequencies. The effect of the ultrasonic stage is better, but the effect is weaker in the high-frequency ultrasonic stage. At the same time, there are many inconveniences in the preparation of three-dimensional crystals. There are many technical difficulties in introducing these achievements into the field of surface acoustic wave research. Carry out research on acoustic metamaterials that are different from current phononic crystals

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