scholarly journals Tunable Interferometers Driven by Coherent Surface Acoustic Phonons

MRS Advances ◽  
2016 ◽  
Vol 1 (22) ◽  
pp. 1651-1656 ◽  
Author(s):  
Antonio Crespo-Poveda ◽  
Alberto Hernández-Mínguez ◽  
Klaus Biermann ◽  
Abbes Tahraoui ◽  
Bernardo Gargallo ◽  
...  
Keyword(s):  
Building Block ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Acoustic Power ◽  
Frequency Range ◽  
Acoustic Frequency ◽  
Side Channels ◽  
Multi Mode ◽  
Mode Interference ◽  
Theory And Experiment

ABSTRACTWe demonstrate a compact tunable photonic modulator driven by surface acoustic waves (SAWs) in the low GHz frequency range. The device follows a well-known Mach-Zehnder interferometer (MZI) structure with three output channels, built upon multi-mode interference (MMI) couplers. The light continuously switches paths between the central and the side channels, avoiding losses and granting a 180◦-dephasing synchronization between them. The modulator was monolithically fabricated on (Al,Ga)As, and can be used as a building block for more complex photonic functionalities. It can also be implemented in other material platforms such as Silicon or (In,Ga)P. Light modulated at multiples of the fundamental acoustic frequency can be accomplished by adjusting the applied acoustic power. An excellent agreement between theory and experiment is achieved.

HIGH-PERFORMANCE SURFACE TRANSVERSE WAVE RESONATORS IN THE LOWER GHz FREQUENCY RANGE

2000 ◽  
Vol 10 (03) ◽  
pp. 735-792 ◽  
Author(s):  
IVAN D. AVRAMOV
Keyword(s):  
Phase Noise ◽  
Transverse Wave ◽  
High Power ◽  
Acoustic Waves ◽  
Power Efficiency ◽  
Surface Acoustic Waves ◽  
Low Noise ◽  
Propagation Loss ◽  
Range Data ◽  
Frequency Range

Since the first successful surface transverse wave (STW) resonator was demonstrated by Bagwell and Bray in 1987, STW resonant devices on temperature stable cut orientations of piezoelectric quartz have enjoyed a spectacular development. The tremendous interest in these devices is based on the fact that, compared to the widely used surface acoustic waves (SAW), the STW acoustic mode features some unique properties which makes it very attractive for low-noise microwave oscillator applications in the 1.0 to 3.0 GHz frequency range in which SAW based or dielectric resonator oscillators (DRO) fail to provide satisfactory performance. These STW properties include: high propagation velocity, material Q-values exceeding three times those of SAW and bulk acoustic waves (BAW) on quartz, low propagation loss, unprecedented 1/f device phase noise, extremely high power handling ability, as well as low aging and low vibration sensitivity. This paper reviews the fundamentals of STW propagation in resonant geometries on rotated Y-cuts of quartz and highlights important design aspects necessary for achieving desired STW resonator performance. Different designs of high- and low-Q, low-loss resonant devices and coupled resonator filters (CRF) in the 1.0 to 2.5 GHz range are characterized and discussed. Design details and data on state-of-the-art STW based fixed frequency and voltage controlled oscillators (VCO) with low phase noise and high power efficiency are presented. Finally, several applications of STW devices in GHz range data transmitters, receivers and sensors are described and discussed.

The Green’s function for surface acoustic waves: Comparison between theory and experiment

1996 ◽  
Vol 100 (3) ◽  
pp. 1538-1541 ◽  
Author(s):  
A. Mourad ◽  
C. Desmet ◽  
W. Lauriks ◽  
H. Coufal ◽  
J. Thoen
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Theory And Experiment

scholarly journals Morphology and acoustic artefacts of copper deposits electroplated using megasonic assisted agitation

Circuit World ◽  
2016 ◽  
Vol 42 (3) ◽  
pp. 127-140 ◽  
Author(s):  
Thomas D.A. Jones ◽  
David Flynn ◽  
Marc P.Y. Desmulliez ◽  
Dennis Price ◽  
Matthew Beadel ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Printed Circuit Boards ◽  
Surface Acoustic Waves ◽  
Electrolyte Solutions ◽  
Acoustic Power ◽  
Circuit Boards ◽  
Content Type ◽  
Measuring Surface ◽  
Micro Bubble ◽  
The Impact

Purpose This study aims to understand the influence of megasonic (MS)-assisted agitation on printed circuit boards (PCBs) electroplated using copper (Cu) electrolyte solutions to improve plating efficiencies through enhanced ion transportation. Design/methodology/approach The impact of MS-assisted agitation on topographical properties of the electroplated surfaces was studied through a design of experiments by measuring surface roughness, which is characterised by values of the parameter Ra as measured by white light phase shifting interferometry and high-resolution scanning electron microscopy. Findings An increase in Ra from 400 to 760 nm after plating was recorded for an increase in acoustic power from 45 to 450 W. Roughening increased because of micro-bubble cavitation energy and was supported through direct imaging of the cavitation. Current thieving effect by the MS transducer induced low currents, leading to large Cu grain frosting and reduction in the board quality. Current thieving was negated in plating trials through specific placement of transducer. Wavy electroplated surfaces, due to surface acoustic waves, were also observed to reduce the uniformity of the deposit. Research limitations/implications The formation of unstable transient cavitation and variation of the topology of the Cu surface are unwanted phenomena. Further plating studies using MS agitation are needed, along with fundamental simulations, to determine how the effects can be reduced or prevented. Practical implications This study can help identify manufacturing settings required for high-quality MS-assisted plating and promote areas for further investigation, leading to the development of an MS plating manufacturing technique. Originality/value This study quantifies the topographical changes to a PCB surface in response to MS agitation and evidence for deposited Cu artefacts due to acoustic effects.

scholarly journals Time-resolved coherent X-ray diffraction imaging of surface acoustic waves

2014 ◽  
Vol 47 (5) ◽  
pp. 1596-1605 ◽  
Author(s):  
Jan-David Nicolas ◽  
Tobias Reusch ◽  
Markus Osterhoff ◽  
Michael Sprung ◽  
Florian J. R. Schülein ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Pulse Length ◽  
Grazing Incidence ◽  
High Temporal Resolution ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
Acoustic Frequency ◽  
X Ray ◽  
Diffraction Imaging

Time-resolved coherent X-ray diffraction experiments of standing surface acoustic waves, illuminated under grazing incidence by a nanofocused synchrotron beam, are reported. The data have been recorded in stroboscopic mode at controlled and varied phase between the acoustic frequency generator and the synchrotron bunch train. At each time delay (phase angle), the coherent far-field diffraction pattern in the small-angle regime is inverted by an iterative algorithm to yield the local instantaneous surface height profile along the optical axis. The results show that periodic nanoscale dynamics can be imaged at high temporal resolution in the range of 50 ps (pulse length).

scholarly journals Long-range transport of 2D excitons in dynamic acoustic lattice

2021 ◽  
Author(s):  
Ruoming Peng ◽  
Adina Ripin ◽  
Yusen Ye ◽  
Jiayi Zhu ◽  
Changming Wu ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Diffusion Length ◽  
Surface Acoustic Waves ◽  
Optical Excitation ◽  
Acoustic Power ◽  
2D Semiconductors ◽  
Effective Contact ◽  
Dynamic Potential ◽  
Range Transport ◽  
Contact Free

Abstract Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to a weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the dynamic potential lattice induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches a distance at least ten times longer than the diffusion length, only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to an acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers.

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

Attenuation of surface acoustic waves by quantum dots

1998 ◽  
Vol 77 (5) ◽  
pp. 1195-1202
Author(s):  
Andreas Knabchen Yehoshua, B. Levinson, Ora
Keyword(s):  
Quantum Dots ◽  
Acoustic Waves ◽  
Surface Acoustic Waves
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