In a free‐standing 400‐nm‐thick platelet of crystalline ZY‐LiNbO 3 , narrow electrodes (500 nm) placed periodically with pitch few microns can eXcite standing shear‐wave bulk acoustic resonances (XBARs), by utilising lateral electric fields oriented parallel to the Y ‐axis and plane platelet. The resonance frequency ∼4800 MHz is determined mainly thickness only weakly depends on electrode width pitch. Simulations show quality‐factors ( Q ) at anti‐resonance higher than 1000. Measurements...

Microacoustic resonators made on suspended continuous membranes of LiNbO 3 were recently shown to have very strong coupling and low losses at ≥5 GHz, suitable for high‐performance filter design. Employing these simple resonator structures, the authors designed, fabricated, measured a 4.7 GHz bandpass ladder‐type having 1 dB mid‐band loss 600 MHz bandwidth address 5G Band n79 requirements. The is fabricated monolithic substrate using standard i‐line optical lithography semiconductor...

The superfluid density rho_s(T) = 1/lambda^2(T) has been measured at 2.64 GHz in highly underdoped YBCO, 37 dopings with T_c between 3 K and 17 K. Within limits set by the transition width Delta ~ 0.4 K, shows no evidence of critical fluctuations as T goes to T_c, a mean-field-like indication vortex unbinding. Instead, we propose that rho_s displays behaviour expected for quantum phase (3 + 1)-dimensional XY universality class, rho_s0 (p - p_c), p_c)^1/2 (T_c T)^1 T_c.

In a free ZY-LiNbO3 400nm thick platelet, narrow electrodes (500nm wide) placed periodically with pitch of few micrometers can eXcite standing Bulk Acoustic shear wave Resonances (XBARs), by means lateral electric field parallel to crystalline Y- axis. The resonance frequency around 4.8GHz and 13.6GHz are suitable for development RF filters. XBARs 3rd, 5th even 9th harmonics were observed up 38 GHz.

Application of finite element methods (FEM) to the simulation SAW devices has been constrained by large number degrees-of-freedom required, resulting in memory usage and long computation times. Here, we propose a hierarchical cascading approach which takes advantage periodic structure typical devices. In this approach, each unique electrode period is modeled simulated only once. Smaller blocks are cascaded describe larger until whole device modeled. This equivalent full with FEM, however —...

This study lays a foundation for the design of SH0 plate acoustic wave (PAW) resonators based on LiNbO3 plate, and are applicable to ultra-wideband filters next-generation tunable filters. The coupling coefficient ( k2 ) mode is optimized as high 55% wideband spurious well controlled by analyzing propagation characteristics modes in LiNbO3. demonstrated be slowly dispersive features superiority interdigital transducer (IDT)-defining frequency over most other modes. On device level, types...

Zero-field electron spin resonance (ESR) of dilute Gd ions substituted for Y in the cuprate superconductor YBa$_2$Cu$_3$O$_{\rm 6+y}$ is used as a novel technique measuring absolute value low temperature magnetic penetration depth $\lambda(T\to 0)$. The ESR spectrum samples with $\approx 1%$ substitution was obtained broadband microwave that measures power absorption bolometrically from 0.5 GHz to 21 GHz. This determined by crystal field lifts level degeneracy 7/2 Gd$^{3+}$ ion and details...

Application of the finite-element method (FEM) for simulation surface acoustic wave (SAW) devices has been constrained by large number degrees freedom required, resulting in memory usage and long computation times. We propose a new 2-D algorithm that takes advantage periodic structure typical SAW devices. The device is partitioned into small, repeatedly occurring building blocks. Only unique blocks are simulated with FEM. geometry presented as hierarchical tree cascading operations, where...

A suspended 400nm thin mono-crystalline ZY cut Lithium Niobate (LN) membrane with narrow interdigital electrodes (IDEs) on top having a pitch of the order few microns excites standing shear bulk acoustic wave resonance (XBAR) within through lateral field excitation. Recently first XBAR was simulated and demonstrated experimentally frequency 4800MHz high electromechanical coupling about 25% loaded quality factor at close to 500. This device lays path production RF filters for 5G applications...

A quadrupole-based instrument (HP-4500), a double focusing single collector (Element) and multicollector (IsoProbe) were all evaluated for the precise accurate measurement of lead isotope ratios using Tl as internal ratio standard. The accuracy was NIST 981 Common Lead Isotope standard reference material an enriched 204Pb spike. Mass bias correction performed exponential model in three instruments equations evaluation total combined uncertainty arising from dead time mass developed. It...

There has long been a discrepancy between microwave conductivity measurements in high temperature superconductors and the spectrum expected simplest models for impurity scattering d-wave superconductor. Here we present new type of broadband measurement surface resistance that finally shows some spectral features d(x2-y2) pairing state. Cusp-shaped spectra, consistent with weak nodal quasiparticles, were obtained 0.6-21 GHz frequency range highly ordered crystals YBa2Cu3O6.50 YBa2Cu3O6.99.

Here we demonstrate some generic 2D and 3D routines for SAW analysis employing the commercial COMSOL Multiphysics platform finite element (FEA). More specifically, consider optimization of high performance LSAW resonators RF filters. The nature - being well studied sufficiently complicated is chosen as a suitable example results are compared to state-of-the-art knowledge. We found very good agreement between analytical scheme proposed here state-of-art findings. Finally, TC-SAW piston-mode...

We have made the first complete measurements of London penetration depth $\lambda(T)$ CeCoIn5, a quantum-critical metal where superconductivity arises from non-Fermi-liquid normal state. Using novel tunnel diode oscillator designed to avoid spurious contributions $\lambda(T)$, we established existence intrinsic and anomalous power-law behaviour at low temperature. A systematic analysis raises possibility that unusual observations are due an extension quantum criticality into superconducting

Extensive measurements of the microwave conductivity highly pure and oxygen-ordered \YBCO single crystals have been performed as a means exploring intrinsic charge dynamics d-wave superconductor. Broadband fixed-frequency apparatus together provide very clear picture electrodynamics superconducting condensate its thermally excited nodal quasiparticles. The reveal existence long-lived excitations deep in state, evidenced by sharp cusp-like spectra with widths that fall well within our...

A novel low temperature bolometric method has been devised and implemented for high-precision measurements of the microwave surface resistance small single-crystal platelet samples having very absorption, as a continuous function frequency. The key to success this non-resonant is in-situ use normal metal reference sample that calibrates absolute rf field strength. can be controlled independently 1.2 K liquid helium bath, allowing evolution absorption. However, instrument's sensitivity...

Abstract Acoustic cytometry is a new technology that replaces or partly hydrodynamic focusing of cells particles with derived from acoustic radiation pressure forces. It offers possibilities for improving current flow assays and creating ones. To take full advantage these possibilities, it necessary to understand the fundamental benefits limitations as employed in analysis, either substitute combination it. Curr. Protoc. Cytom . 49:1.22.1‐1.22.12. © 2009 by John Wiley & Sons, Inc.

Recently, hierarchical cascading accelerated with graphics processing units (GPUs) has proven efficient for accelerating 3D periodic finite-element method (FEM) analysis of acoustic wave devices. However, the limited memory available in GPUs severely restricts accuracy simulations; moreover, numerical libraries are not fully matured yet. This paper considers two techniques to circumvent these limitations. Firstly, extend size problems that can be handled, use isolated operations. While...

view Abstract Citations (32) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Direct evidence of type III electron streams propagating in coronal streamers Kundu, M. R. ; Gergely, T. E. Turner, P. J. Howard, A. Using two-dimensional solar images at 73.8 MHz, obtained with the Clark Lake Multifrequency Radioheliograph, authors present direct that propagate dense streamers. This is substantiated by excellent coincidence found position angle...

In order to minimize losses due bulk-acoustic radiation, `leaky' SAW resonators on rotated Y-cut LiTaO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> typically employ synchronous design, with all the electrodes in IDT and reflectors sharing same periodicity electrode shape. The change electric connection pattern between creates an discontinuity, which can serve as additional source of bulk wave radiation. this work, numerical FEM...

The performance of three different ICP-MS instruments for the determination lead in biological reference materials by isotope dilution analysis has been evaluated. A quadrupole-based instrument (HP-4500), a double focusing single collector (Element) and multicollector (IsoProbe) were all evaluated precise accurate measurement ratios their application to using enriched 204Pb. Detector dead time influenced measured only Element while mass bias was corrected thallium added each sample. Accurate...

This work presents the fabrication of a MEMS resonant device which addresses need for high quality and miniaturized RF filters in 3-6 GHz range 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> generation (5G) mobile networks. The 4-mask process is based on definition interdigitated Aluminum (Al) electrodes suspended membrane 400 nm-thick Z-cut lithium niobate (LiNbO <sub xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ). Devices are...

Recent trends in cellular handsets demand SAW resonators with increased performance. Most importantly, improvements both the resonators' quality factor (Q) and temperature coefficient of frequency (TCF) are needed. The TC-SAW concept employing buried Cu electrodes SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /128°Y-LiNbO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> has attracted considerable practical interest this view,...

We have developed a low temperature, high-resolution microwave surface impedance probe that is able to operate in high static magnetic fields. Surface measured by cavity perturbation of dielectric resonators, with sufficient sensitivity resolve the absorption sub-mm-sized superconducting samples. The resonators are constructed from permittivity single-crystal rutile (TiO2) and quality factors excess 10^6. Resonators such performance traditionally required use materials, making them...