Theoretical aspects of GSAW and HVPSAW propagation properties for zinc oxide films on silicon carbide and correlation with experimental data

Didenko, I. S.; Hickernell, F.S.; Naumenko, Natalya

doi:10.1109/ultsym.1999.849409

Cited by 3 publications

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“…A pair of IDTs with split electrode geometry was fabricated. 16,17 The effect of UV light ( ‫ס‬ 365 nm) of varying intensity (5 to 40 mW/cm 2 ) on the frequency response of the SAW delay line was studied using an Agilent network analyzer (Model 8712ES, 300 KHz to 1.3 GHz). The fundamental center frequency of the as-fabricated SAW delay line was 36.31 MHz, and besides the fundamental mode (or Rayleigh mode) other high frequency harmonics and modes were also observed.…”

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Interaction of surface acoustic waves and ultraviolet light in ZnO films

2003

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The frequency response of a 37 MHz bulk LiNbO 3 surface acoustic wave (SAW) filter with a 200-nm-thick ZnO overlayer exhibited a downshift in the frequency with ultraviolet (UV) light due to acoustoelectric interactions between the photo-generated carriers in the semiconducting ZnO and the surface acoustic waves. In contrast, a 36 MHz ZnO thin film SAW delay-line with insulating ZnO films exhibited an upshift in the frequency. The response was more pronounced at higher harmonics and was attributed to changes in the elastic/dielectric properties in the upper surface layer of ZnO. A linear change in the frequency with UV intensity shows immense applicability for wireless ultraviolet sensor applications.

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Interaction of surface acoustic waves and ultraviolet light in ZnO films

2003

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“…29 The film thickness is a critical parameter to achieve low propagation loss for the pseudo SAWs. Materials like diamond and SiC have high stiffness constants, thus higher phase velocity modes, when compared to commonly used SAW orientations on LiNb0 3 , LiTa0 3 , and quartz.…”

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PSEUDO AND HIGH VELOCITY PSEUDO SAWs

Cunha

2000

Int. J. Hi. Spe. Ele. Syst.

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This article discusses the characteristics of pseudo surface waves (PS AWs) and high velocity pseudo surface waves (HVPSAWs). The fundamental properties of these waves, the matrix method formulation, the different solution types due to crystal symmetry, early experiments on HVPSAWs, and practical applications of pseudo surface acoustic waves serve as an introduction. The solutions to the pseudo modes are discussed by analyzing the boundary condition function for several orientations. The relation between the radiating partial modes and the sagittal plane bulk slowness reveals new characteristics of the different symmetry types of H VPS AW, and helps classify and understand the pseudo modes. The acoustoelectric Poynting vector is used along different crystal symmetry orientations to reveal and discuss the pseudo SAW characteristics: penetration depth, declination of the power vector, and an estimation of power flow angle. Experimental data and numerical solutions of HVPS AW and PS AW along selected planes and orientations are discussed. This article concludes with a brief analysis of layered structures on different symmetry type substrates and a discussion of the layered pseudo surface wave properties. 203 Int. J. Hi. Spe. Ele. Syst. 2000.10:1069-1109. Downloaded from www.worldscientific.com by UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN on 03/11/15. For personal use only.204 Int. J. Hi. Spe. Ele. Syst. 2000.10:1069-1109. Downloaded from www.worldscientific.com by UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN on 03/11/15. For personal use only. Early Experiments on HVPSA WLike the PSAW, the experimental evidence for the HVPSAW goes back over two decades. Some of the early experiments that detected the HVPSAW classified this wave as: "longitudinal bulk wave," "surface skimming bulk wave," "shallow bulk acoustic wave," or "quasi-bulk acoustic surface wave"; mostly due to the proximity of the phase velocity to the planar longitudinal bulk wave velocity in the direction of propagation. 5 ' 6 ' 7 ' 8 ' 910 The name "surface skimming bulk wave" has also been used for both PSAW and HVPSAW in early publications. 6 ' 11 Since a bulk acoustic wave, BAW, in a piezoelectric material does not satisfy the mechanically free boundary conditions, the mode experimentally identified could not be a BAW .The existence of an independent high-velocity pseudo SAW mode was identified by researchers from Brillouin scattering experiments on cubic materials. 12 Jhunjhunwala also discussed the pseudo SAWs, grouping them as first or second order pseudo SAWs, according to the number of radiating partial modes. 13 As mentioned in 1.2, the HVPSAW might have one or two radiating partial modes, depending on the symmetry of the orientation of propagation. Therefore a classification according to the number of radiating partial modes is not appropriate. Reference 12 estimates the HVPSAW to have high loss for the gallium arsenide, GaAs, orientations discussed in that paper. This is not the case for other materials and orientations as discussed in this pape...

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Pseudo and High Velocity Pseudo SAWs

Cunha¹

2000

International Journal of High Speed Electronics and Systems

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Theoretical aspects of GSAW and HVPSAW propagation properties for zinc oxide films on silicon carbide and correlation with experimental data

Cited by 3 publications

References 6 publications

Interaction of surface acoustic waves and ultraviolet light in ZnO films

Interaction of surface acoustic waves and ultraviolet light in ZnO films

PSEUDO AND HIGH VELOCITY PSEUDO SAWs

Pseudo and High Velocity Pseudo SAWs

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