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Construction of smart city has become a historical trend in the world. The management of underground pipes and the intelligent concrete are the main part of building smart city in China. Compared with the available electronic marker system, SAW-RFID system has shown excellent properties: truly passive, strong penetrating capability, long service-life, sensing and ID integration, and etc. Thus, SAW-RFID...
Diamond has the highest sound velocity among all materials and has been applied in high frequency surface acoustic wave (SAW) devices in the gigahertz range. To date, numerous researches have reported that the SAW devices built on a diamond wafer can work in the frequency range from 2 GHz to 10 GHz. S. Fujii et al. reported that the one-port resonator with an interdigital transducer (IDT)/AlN/single...
In this paper, we describe a 920 MHz band long range wireless SAW passive tag system (WSPTS) for vibration monitoring, which achieves more than 10m reading distance. For the purpose of structural health monitoring (SHM) of aging infrastructures (e.g. bridge, building, and so forth), passive wireless sensor systems are an attractive option because they are operated battery-less and almost maintenance...
Lithium (Li) has long been known to be the best anode material for rechargeable batteries, however, lithium metal batteries (LMB) have never been commercialized due to dendrite formation, resulting in thermal runaway and fire or explosion. During charging, Li ions deposit onto Li anode from the cathode via electrolyte. However, the deposition is not uniform due to the inhomogeneous ion distribution...
Coupling between surface acoustic waves (SAW) and arrays of mechanical resonators has appeared early in SAW history as a potential means to slow down wave propagation through mass-loading, in particular by creating corrugations on the substrate surface. This concept has been revisited over the past few years in the context of locally-resonant phononic crystals where pillars deposited on a homogeneous...
Suppression of the SH-SAW response is mandatory to design TC SAW devices on θ degree rotated Y-cut LiNbO3. However, it is not easy because K2 for SH SAW changes rapidly with θ, and its optimal value in terms of the SH-SAW suppression is dependent on electrode and SiO2 thicknesses. The authors found that the optimal θ always locates close to θ where difference in velocities of two SAWs is minimum....
Catheter-delivered ultrasound has been widely utilized for intravascular therapies such as thrombolysis, drug delivery, and plaque removal. High amplitude pressure is required for cavitation induced-microstreaming, which is considered main factor for therapeutic efficiency. Precise spatiotemporal control of insonation is important to relieve concerns on ultrasound-induced damaging of surrounding healthy...
Over the course of accelerated failure testing of 2-port SAW delay line resonators on quartz, periodic acoustomigration damage patterns with acoustic apertures of less than 6 wavelengths were observed across the fully metalized region between the transducers, while typical electrode stress damage was observed over the acoustic aperture in the transducer gratings. This suggested the power density had...
Recently, contactless manipulation of immersed objects has garnered great interest. Specifically, acoustic manipulation in microfluidic channels has emerged as a tool to control micron-sized objects in chemical, medical, and biological applications. Pure and controllable acoustic forces of the acoustic manipulation method exhibit a minor negative impact on viability and functionality of biological...
It is crucial to transport foreign substance into living cells efficiently and minimize adverse side-effects. Using ultrasound microbubble, it is possible to enhance the cellular uptake and transfer the extracellular molecules into cells, this process is called sonoporation. However, the spatial location of microbubbles appears to be a stochastic process, which makes the targeted sonoporation at specific...
Recently, it was shown that heavily doped AlN film possess the high piezoelectricity by Akiyama et al [1]. On the other hand, SAW devices were widely used as filters and sensors. Among them, SAW in ScAlN film is attracting a lot of attention because this SAW devices have high electromechanical coupling coefficient K2. We analyzed the K2 value in Sc0.4Al0.6N was increased by c-axis tilted angle θ becoming...
I.H.P. SAW (Incredible High-Performance SAW) has a novel multi-layered structure to confine SAW energy in substrate surface area, and it shows extremely high quality (Q) factor, low temperature coefficient of frequency (TCF) and improved electromechanical coupling coefficient (K2). This paper introduces its mechanism of the high acoustic Q factor, both theoretically and experimentally, and its applications...
Analog signal processing techniques based on surface acoustic wave (SAW) devices have been commercialized in the past 50 years. Delay lines [1] and resonators [2] have been implemented for a wide range of applications [3]. The use of small scale resonators has boomed because of the continuous growth of the cell phone business, whereas components such as delay lines have been relegated to smaller markets...
Wireless SAW resonant sensors have been widely used in many applications, especially in harsh environment. The sensor is detected when the echo signal spectrum processed by Fourier transform exceeds a threshold. Because of complicated noise and electromagnetic interference in wireless channel, the threshold should be adaptive to interference in order to detect the sensor accurately. However, few researches...
In order to achieve better performance of bulk and surface acoustic wave resonators operating at several GHz, it is crucial to dispose of advanced techniques and methods to provide information about the elastic constants of the constituent layered materials and to image the spatial profile of the acoustic field, both inside and outside the resonator.
Oil has been used in many fields, such as transportation systems and machine tools. Performances of those depend on oil quality. However, quality is normally checked by visual inspection. Therefore, it is required to develop a sensor for monitoring oil quality to measure online and real time. A shear horizontal surface acoustic wave (SH-SAW) sensor can detect liquid properties. In this paper, particles...
Surface acoustic wave (SAW) devices are widely used as acoustic-electronic components today. The lithium niobate was often used as the substrate of SAW devices for its higher electromechanical coupling coefficient. In some applications like RFID tags and sensors, SAW devices have a long delay line and the energy loss of diffraction is considerable. Phononic crystals (PnC) have properties of band gaps...
Recently we reported on fabrication and characterization of a novel type of hybrid resonator in which BAW transforms into SAW due to a periodic pillar pattern of piezoelectric material. This device looks promising thanks to high achievable electromechanical coupling (over 4%) and possibility for application as sensor in harsh environment when using AlScN as piezoelectric. The main feature of the device...
Nanoparticle manipulation has a variety of potential applications, from two-dimensional material fabrication to biomedical engineering. Pattern and transportation of nanoparticles has been receiving increasing attention in recent years. Ultrasound as a mechanical wave has proven to be the most effective in the manipulation of micro-objects in a non-contact and non-invasive fashion. However, due to...
The SAW on rotated “leaky” Y-cuts LiTaO3 and LiNbO3 is a dominantly localized near surface slow shear-horizontal wave, which is weakly coupled to the fast shear bulk wave. Any surface perturbation can lead to radiation of bulk-acoustic waves from the device, increasing losses. To minimize this radiation, LSAW resonators are typically synchronous, with all electrodes in the IDT and in the reflectors...
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