Implementation of guiding layers of surface acoustic wave devices: A review

Xu, Zhangliang; Yuan, Yong J.

doi:10.1016/j.bios.2017.07.060

Cited by 65 publications

(36 citation statements)

References 94 publications

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“…Surface acoustic wave (SAW) devices have received extensive interest for sensor applications owing to their small size, high sensitivity and ability to interface with passive wireless systems [1][2][3][4][5][6]. SAW devices can be developed into highly sensitive sensors for continuously monitoring of hazardous and flammable gases in the sub-ppm regime if integrating with specifically designed sensing materials which are sensitive to a certain type of gas.…”

Section: Introductionmentioning

confidence: 99%

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Kan

Chen

et al. 2019

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Kan

Chen

et al. 2019

Sensors and Actuators B: Chemical

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“…For detection of analytes in liquid, SAW Love mode sensors with high sensitivity were used (Rocha-Gaso et al, 2009). To enhance the performance of conventional SAW devices based on such periodic wave guiding layers, several structure models were reviewed (Xu and Yuan, 2018). These Love-type wave based devices consist of an elastic layer bonded to an elastic substrate.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Love-type waves in an elastic layer sandwiched between viscous liquid half space and size dependent couple stress substrate

Sharma

Kumar

2019

Journal of Theoretical and Applied Mechanics

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Dispersion curves employed for designing Love wave based liquid sensing devices may provide more accurate information if due consideration is given to parameters describing microstructural behavior of the substrate. The present study involves mathematical modelling of Love waves propagating in a hybrid structure consisting of an elastic layer in the middle overlying a size dependent substrate, loaded with a viscous liquid (Newtonian) half space. Numerical computations are carried out to graphically demonstrate the effects of various parameters: characteristic length of the substrate, thickness of the elastic layer, viscosity and density of the overlying viscous liquid (Newtonian) on dispersion characteristics.

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“…Over the past few years, waveguiding layers have also found use as biosensors (Xu et al, 2018;Gizeli et al, 2003). The typical structure consists of input IDTs and output IDTs both on a piezoelectric substrate.…”

Section: Types Of Waveguidesmentioning

confidence: 99%

A review: controlling the propagation of surface acoustic waves via waveguides for potential use in acoustofluidics

Mei

Friend

2020

Mechanical Engineering Reviews

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This paper presents a review of waveguides on lithium niobate for surface acoustic waves (SAWs), including in particular the classic literature on the topic with the intent of renewing interest in them in the context of potential applications in the burgeoning discipline of micro to nano-scale acoustofluidics. From the fundamentals of the piezoelectric effect we describe interdigital electrodes and how they generate acoustic waves, consider focusing interdigital electrodes as a simple means of laterally confining the acoustic energy propagating across a substrate, and then quickly move to waveguiding structures that provide confinement by defining either a region of slow wave velocity or a physically isolated structure. The ability to steer acoustic waves using these waveguides is considered. The many analytical, computational, and experimental tools devised by past investigators to design them are discussed in detail, as are the relative advantages and disadvantages of the waveguide designs considered over the years.The most popular materials that are used to make SAW devices include quartz, lithium tantalate (LT) LiTaO 3 and lithium niobate (LN) LiNbO 3 . Others include gallium arsenide (GaAs), cadmium sulfide (CdS), zinc oxide (ZnO), lithium tetraborate (Li 2 B 4 O 7 ), and lanthanum gallium silicate (La 3 Ga 5 SiO 12 ) (Thurston et al., 1998). Due to the crystalline structure of these materials, the type of wave generated is strongly dependent on the choice and orientation of the material as discussed above. Lithium niobate has been the preferred material for devices requiring high efficiency, as it possesses a relatively large electromechanical coupling coefficient open-circuit) and v m is the SAW velocity along a short-circuited surface. Of the various cuts possible, the 131 • Y-rotated cut for X-propagating SAW in LN was found to have the highest electromechanical coupling coefficient for SAW (Slobodnik et al., 1970), relative to other cuts in LN and other choices of single-crystal piezoelectric media. In 1976, Shibayama et al. conducted experiments to determine the optimum rotated Y-cut of LN to generate "true" SAWs and concluded that the 127.86 • Y-rotated choice for X-propagating SAW in lithium niobate (128 • YX LN) reduced the generation of other parasitic waves and retained most of the electromechanical coupling and low insertion loss observed in the 131 • Y-rotated cut of LN. Generating SAW on lithium niobateInterdigital transducers are one of the most widely used devices that generate and detect SAWs. The first and simplest IDTs (White et al., 1965) consisted of straight rectangular metal bars-fingers-deposited on the surface of a piezoelectric substrate. Alternately connected on their end to common electrodes or bus bars, the fingers appear as depicted in Fig. 1. An array of electric fields of alternating direction is created between the transducer finger pairs, and thus in turn induces alternating regions of compression and tension in the substrate. Each finger pair therefore produces displacemen...

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Implementation of guiding layers of surface acoustic wave devices: A review

Cited by 65 publications

References 94 publications

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Modelling of Love-type waves in an elastic layer sandwiched between viscous liquid half space and size dependent couple stress substrate

A review: controlling the propagation of surface acoustic waves via waveguides for potential use in acoustofluidics

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