Surface Acoustic Wave Slanted Device Technology

Potter, B.R.; Hartman, C.S.

doi:10.1109/t-su.1979.31125

Cited by 25 publications

(2 citation statements)

References 6 publications

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“…2(b)]. [18][19][20][21] Chirp IDT configuration is more ideal for larger interaction zone and higher diffraction efficiency, but chirp IDT is more complex and causes unpredicted fabrication errors easily. In the pattern processes for high frequency SAW radiation, the chirp IDT has a long and thin IDT aperture length, while the slanted IDT has very short aperture segment in high frequency region, leading for the slanted IDT to be easier to avoid unpredicted fabrication errors.…”

Section: Optimal Design For Wide Bandwidth Idt Configurationmentioning

confidence: 99%

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Lee¹,

Fu²,

Lee³

2016

Jpn. J. Appl. Phys.

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We have developed acoustic-optic (AO) based display units for implementing a handheld hologram display by modulating light deflection through wide bandwidth surface acoustic wave (SAW). The developed AO device consists of a metal layer, a ZnS waveguide layer, SAW inter digital transducers (IDTs), and a screen for display. When RF power with a particular resonant frequency was applied to IDTs, SAW was radiated and interfered with confined beam propagating along ZnS waveguide layer. The AO interacted beam was deflected laterally toward a certain direction depending on Bragg diffraction condition, exited out of the waveguide layer and then directed to the viewing screen placed at a certain distance from the device to form a single pixel. The deflected angles was adjusted by modulating the center frequency of the SAW IDT (SAW grating), the RF power of SAW, and the angles between propagating light beam path along waveguide and radiating SAW. The diffraction efficiency was also characterized in terms of waveguide thickness, SAW RF input power, and aperture length. Coupling of mode (COM) modeling was fulfilled to find optimal device parameters prior to fabrication. All the parameters affecting the deflection angle and efficiency to form a pixel for a three-dimensional (3D) hologram image were characterized and then discussed.

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Section: Optimal Design For Wide Bandwidth Idt Configurationmentioning

confidence: 99%

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Lee¹,

Fu²,

Lee³

2016

Jpn. J. Appl. Phys.

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“…SAW technology needs to increase the BT of the devices to keep ahead of digital technology. Slanted transducers [1][2][3][4][5] are the key to achieving large BT devices.…”

Section: Introductionmentioning

confidence: 99%

Improved SAW Slanted Array Compressor structure for achieving > 20,000 time-bandwidth product

Dufilie¹,

Valerio²,

Martin³

2014

2014 IEEE International Ultrasonics Symposium

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Many of today's radar systems rely on digital processing for pulse compression. The future of SAW LFM pulse compression systems depends on achieving at least comparable performances to all-digital solutions.SAW-based pulse compression systems can consume less power and have higher dynamic range than all-digital systems, properties important for portable and long-range radars. The future market for SAW dispersive devices depends on development of larger timebandwidth (BT) product device structures. Currently a BT of 10,000 is achievable, with a goal of > 20,000 in a single SAW device.The SAW structure which achieves the largest %BW is the Slanted Array Compressor (SAC) on a LiNbO3 substrate. The structure consists of two slanted aperiodic transducers with balanced microstrip bus bars and refraction-correcting acoustic lenses. It may also include a metallic shield/phase correction region between the two transducers. By using a different number of strips-per-wavelength for each transducer (e.g. 3 and 4 strips/λ) it is possible to increase the spurious-free %BW to greater than 100%. This eliminates the mechanical reflections when 2 strips/λ transducers are used. The acoustic impedances are increased by using series-connected transducer channels.The new structure eliminates the refraction-correcting acoustic lenses by compensating for refraction in the transducer strip region. This approach simplifies device analysis and reduces the sensitivity of insertion loss to temperature.The metallic shield/phase correction region can also be removed by including a compensated digital exciter in the system. Measurements on a dispersive filter having a BT of 15,000 will be presented. Near-ideal performance of 1.8ns 3dB compressed pulse with 30dB close in sidelobes is achieved in a pulse compression system using a compensated digital exciter. The achieved pulse gain through the filter is close to 0dB.

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Point Defects in Cultured Quartz: Recent Acoustic Loss, Infrared, and Magnetic Resonance Results

Martin

Halliburton

Bossoli

1981

Thirty Fifth Annual Frequency Control Symposium

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Surface Acoustic Wave Slanted Device Technology

Cited by 25 publications

References 6 publications

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Improved SAW Slanted Array Compressor structure for achieving > 20,000 time-bandwidth product

Point Defects in Cultured Quartz: Recent Acoustic Loss, Infrared, and Magnetic Resonance Results

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Surface Acoustic Wave Slanted Device Technology

Cited by 25 publications

References 6 publications

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Toward efficient light diffraction and intensity variations by using wide bandwidth surface acoustic wave

Improved SAW Slanted Array Compressor structure for achieving &#x003E; 20,000 time-bandwidth product

Point Defects in Cultured Quartz: Recent Acoustic Loss, Infrared, and Magnetic Resonance Results

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Product

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Improved SAW Slanted Array Compressor structure for achieving > 20,000 time-bandwidth product