The Experts below are selected from a list of 7767 Experts worldwide ranked by ideXlab platform
Shuji Tanaka - One of the best experts on this subject based on the ideXlab platform.
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evidence of a Love Wave bandgap in a quartz substrate coated with a phononic thin layer
Applied Physics Letters, 2014Co-Authors: Tingwei Liu, Yuching Lin, Yaochuan Tsai, Takahito Ono, Shuji TanakaAbstract:This paper presents a numerical and experimental study of Love Wave propagation in a micro-fabricated phononic crystal (PC) structure consisting of a 2D, periodically etched silica film deposited on a quartz substrate. The dispersion characteristics of Love Waves in such a phononic structure were analyzed with various geometric parameters by using complex band structure calculations. For the experiment, we adopted reactive-ion etching with electron-beam lithography to fabricate a submicrometer phononic structure. The measured results exhibited consistency with the numerical prediction. The results of this study may serve as a basis for developing PC-based Love Wave devices.
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wideband tunable Love Wave filter using electrostatically actuated mems variable capacitors integrated on lithium niobate
Sensors and Actuators A-physical, 2012Co-Authors: Toshiki Yasue, Tomoya Komatsu, Nobuyuki Nakamura, Kenya Hashimoto, Hideki Hirano, Masayoshi Esashi, Shuji TanakaAbstract:Abstract A tunable bandpass filters with low insertion loss, sharp cut-off characteristics, wide bandwidth and wide tunability is strongly expected for future reconfigurable and cognitive wireless systems. In this study, a wideband tunable filter with the center frequency of 1.08 GHz was fabricated by directly integrating Love Wave resonators and electrostatically actuated MEMS variable capacitors on a 15° Y LiNbO 3 wafer. The Love Wave resonators have an extremely large electromechanical coupling coefficient ( k 2 ∼ 30%), providing wide bandwidth and wide tuning range. The 3 dB bandwidth was tuned from 146 MHz to 130 MHz by applying 15 V to one of the MEMS variable capacitors.
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wideband tunable Love Wave filter using electrostatically actuated mems variable capacitors integrated on lithium niobate
International Conference on Solid-State Sensors Actuators and Microsystems, 2011Co-Authors: Toshiki Yasue, Tomoya Komatsu, Nobuyuki Nakamura, Kenya Hashimoto, Hideki Hirano, Masayoshi Esashi, Shuji TanakaAbstract:A tunable bandpass filters with low insertion loss, sharp cut-off characteristics, wide bandwidth and wide tunability is strongly expected for future reconfigurable and cognitive wireless systems. We have demonstrated a wideband tunable filter with the center frequency of 1.08 GHz by directly integrating Love Wave resonators and electrostatically-actuated MEMS variable capacitors on a 15 ° Y LiNbO 3 wafer. The Love Wave resonators have an extremely large electromechanical coupling coefficient (k2 ∼ 30 %), providing wide bandwidth and wide tuning range. We confirmed that the 3 dB bandwidth was tuned from 146 MHz to 130 MHz by applying 15 V to one of the MEMS variable capacitors.
Wen Wang - One of the best experts on this subject based on the ideXlab platform.
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development of a novel wireless and passive Love Wave based ice sensor
Internaltional Ultrasonics Symposium, 2019Co-Authors: Yining Yin, Wen Wang, Yana Jia, Yong LiangAbstract:a novel configuration of wireless and passive Love Wave based ice sensing device employing Waveguide structure of SiO 2 /36°YX LiTaO 3 with high mass sensitivity and excellent temperature stability was presented in this work. A reflective delay line consists of a transducer and three reflectors on 36° YX LiTaO 3 substrate with SiO 2 guiding layer was developed as the sensor element. Prior to sensing device development, the coupling of modes (COM) modeling was performed to device simulation. Using the typical lithography technology, the sensing device was developed at 433 MHz, and packaged with a permeable film. Using the experimental setup composed of a high-low temperature chamber, wireless transceiver module and sensing device, the response in time domain of the developed sensing device was characterized. The mass loading effect in icing process modulates the propagation of Love Wave, resulting in the corresponding phase response shift. By wireless measurement, the phase change from water to ice was detected, and the measured results addressed the feasibility and effectiveness of the proposed wireless and passive Love Wave ice sensor.
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enhanced sensitivity of a Love Wave based methane gas sensor incorporating a cryptophane a thin film
Sensors, 2018Co-Authors: Wen Wang, Yong Liang, Caihong Zhang, Shuyao Fan, Yong Pan, Chuan DongAbstract:A Love Wave-based sensing chip incorporating a supramolecular cryptophane A (CrypA) thin film was proposed for methane gas sensing in this work. The Waveguide effect in the structure of SiO₂/36° YX LiTaO₃ will confine the acoustic Wave energy in SiO₂ thin-film, which contributes well to improvement of the mass loading sensitivity. The CrypA synthesized from vanillyl alcohol by a double trimerisation method was dropped onto the Wave propagation path of the sensing device, and the adsorption to methane gas molecules by supramolecular interactions in CrypA modulates the acoustic Wave propagation, and the corresponding frequency shifts were connected as the sensing signal. A theoretical analysis was performed to extract the coupling of modes for sensing devices simulation. Also, the temperature self-compensation of the Love Wave devices was also achieved by using reverse polarity of the temperature coefficient in each media in the Waveguide structure. The developed CrypA coated Love Wave sensing device was connected into the differential oscillation loop, and the corresponding gas sensitive characterization was investigated. High sensitivity, fast response, and excellent temperature stability were successfully achieved.
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temperature compensated Love Wave based gas sensor on Waveguide structure of sio2 36 yx litao3
Smart Materials and Structures, 2015Co-Authors: Wen Wang, Xiao Xie, Gui Chen, Jiuling LiuAbstract:A temperature-compensated Love Wave device was proposed for gas sensing utilizing a Waveguide structure of SiO2/36° YX LiTaO3. Significant improvement in the temperature stability of the hybrid Love Wave device was implemented by varying the guiding layer thickness. The optimal values yielding low cross-sensitivity to temperature and high mass sensitivity in gas sorption were determined theoretically by solving the coupled electromechanical field equation in layered media. The theoretical analysis was confirmed experimentally in dimethylmethylphosphonate (DMMP) detection by using a fluoroalcoholpolysiloxane (SXFA) coated Love Wave sensor. The experimental results indicate that better sensitivity and excellent temperature stability were obtained from the developed Love Wave gas sensor over the Rayleigh surface acoustic Wave (R-SAW) sensors.
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Sensitivity evaluation of a Love Wave sensor with multilayer structure for biochemical application
Microfluidics BioMEMS and Medical Microsystems VII, 2009Co-Authors: Wen Wang, Keekeun Lee, Sangsik YangAbstract:ABSTRACT This paper presents a sensitivity evaluation of a Love Wave sensor with multilayer structure consisting of polymethyl methacrylate (PMMA)/SiO 2 /41 o YX LiNbO 3 . A theoretical model is presented to describe Wave propagation in Love Wave devices with multilayered structure on large piezoelectri c substrate. A complex dispersion equation expanded into Taylor series was presented to describe the lossy mechanism of the PMMA layer. Using the gold film as the sensitive interface, the mass loading sensitivity of the Love Wave sens or for biochemical application was evaluated theoretically, and the effects from the SiO 2 and PMMA on the sensor sensitivity were investigated to allow the design of an optimized structure. From the calculated results, the optimal thicknesses of SiO 2 and PMMA in the multilayered structure were determined, and the sensitivity comparison between Love Waves in LiNbO 3 /SiO 2 /PMMA and LiNbO 3 /PMMA was studied, which shows that there is larger mass loading sensitivity in Love Wave devices with multilayered structure. Keywords: Love Wave biosensor, SiO
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the development of a wireless Love Wave biosensor on 41 yx linbo3
Smart Materials and Structures, 2009Co-Authors: Wen Wang, Keekeun Lee, Churlki Min, Sangsik YangAbstract:This paper presents a novel wireless Love-Wave-based biosensor using a polymethyl methacrylate (PMMA) Waveguide and protein A receptor layers on a 41? YX LiNbO3 piezoelectric substrate for immunoglobulin G (IgG) detection. A 440?MHz reflective delay line composed of single-phase unidirectional transducers (SPUDTs) and three shorted grating reflectors was fabricated as the sensor element. A theoretical modeling was performed to describe the Wave propagation of Love Wave devices on a 41? YX LiNbO3 piezoelectric substrate with large piezoelectricity. The fabricated devices were wirelessly characterized by using the network analyzer as the reader unit. The resultant reflection peaks showed large signal/noise ratio, sharp peaks, and few spurious signals. The binding of the IgG to the protein A receptor layer induced large phase shifts of the reflection peaks due to the mass loading effect. Good linearity, reproducibility, and high sensitivity were observed in the IgG concentration range 1?65?nM. Unique advantages such as high sensitivity and a simple wireless measurement method over other currently available biosensors are also presented.
Qing-ming Wang - One of the best experts on this subject based on the ideXlab platform.
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A study of Love Wave acoustic biosensors monitoring the adhesion process of tendon stem cells (TSCs)
European Biophysics Journal, 2019Co-Authors: James H.-c. Wang, Qing-ming WangAbstract:The Love Wave biosensor is considered to be one of the most promising probing methods in biomedical research and diagnosis, and has been applied to detect the mechano–biological behaviour of cells attached to the surface of the device. More efforts should be devoted to basic theoretical research and relevant device performance analysis that may contribute to the further developments of Love Wave sensors. In this study, a 36º YX -LiTaO_3-based Love Wave sensor with a parylene-C Wave guiding layer was adopted as a cell-based biosensor to monitor the adhesion process of tendon stem/progenitor cells (TSCs), a newly discovered cell type in tendons. A theoretical model is proposed to describe the Love Wave propagation, in which the adherent cells are considered as a uniform viscoelastic layer. The effects of viscoelastic cell layer and Wave guiding layer on the propagation velocity υ and propagation loss (PL) are investigated. The numerical results indicate that adherent cell layers of different storage or loss shear modulus in certain ranges can induce pronounced and characteristic variations in υ and PL, revealing the potential of Love Wave sensors to provide useful quantitative measures on cellular mechanical properties. The sensor response to the adhesion of TSCs exhibits high consistency with experimental observations, which demonstrates the Love Wave biosensor as a very promising sensor platform for investigating cellular activities under multiple physiological conditions.
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theoretical analysis of a Love Wave biosensor in liquid with a viscoelastic Wave guiding layer
Journal of Applied Physics, 2017Co-Authors: Xiangming Xiong, James H.-c. Wang, Qing-ming WangAbstract:The Love mode surface acoustic Wave biosensor is considered as one of the most promising probing methods in biomedical research and diagnosis, which has been applied to detect the mechano-biological behaviors of cells attached to the surface of the device. Recent studies have reported the structural and functional optimization of Love Wave biosensors for reducing propagation loss and improving sensitivity; however, the relevant device performance needs to be analyzed in depth in terms of device structure, electromechanical properties of piezoelectric crystal substrates, viscoelastic properties of Wave guiding layers, and the effect of liquid loading. In this study, a 36° YX-LiTaO3 based Love Wave sensor with a parylene-C Wave guiding layer is considered as a cell-based biosensor. A theoretical model is proposed to describe the Love Wave propagation in the Wave guiding layer and penetration in the liquid medium. Decay length δ for the Love Wave penetration in liquid is found to be in the order of ∼50 nm, w...
Michael I. Newton - One of the best experts on this subject based on the ideXlab platform.
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SU-8 guiding layer for Love Wave devices
Sensors, 2007Co-Authors: Paul Roach, Nicola Doy, Shaun Atherton, Glen Mchale, Michael I. NewtonAbstract:SU-8 is a technologically important photoresist used extensively for the fabrication of microfluidics and MEMS, allowing high aspect ratio structures to be produced. In this work we report the use of SU-8 as a Love Wave sensor guiding layer which allows the possibility of integrating a guiding layer with flow cell during fabrication. Devices were fabricated on ST-cut quartz substrates with a single-single finger design such that a surface skimming bulk Wave (SSBW) at 97.4 MHz was excited. SU-8 polymer layers were successively built up by spin coating and spectra recorded at each stage; showing a frequency decrease with increasing guiding layer thickness. The insertion loss and frequency dependence as a function of guiding layer thickness was investigated over the first Love Wave mode. Mass loading sensitivity of the resultant Love Wave devices was investigated by deposition of multiple gold layers. Liquid sensing using these devices was also demonstrated; water-glycerol mixtures were used to demonstrate sensing of densityviscosity and the physical adsorption and removal of protein was also assessed using albumin and fibrinogen as model proteins.
Glen Mchale - One of the best experts on this subject based on the ideXlab platform.
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SU-8 guiding layer for Love Wave devices
Sensors, 2007Co-Authors: Paul Roach, Nicola Doy, Shaun Atherton, Glen Mchale, Michael I. NewtonAbstract:SU-8 is a technologically important photoresist used extensively for the fabrication of microfluidics and MEMS, allowing high aspect ratio structures to be produced. In this work we report the use of SU-8 as a Love Wave sensor guiding layer which allows the possibility of integrating a guiding layer with flow cell during fabrication. Devices were fabricated on ST-cut quartz substrates with a single-single finger design such that a surface skimming bulk Wave (SSBW) at 97.4 MHz was excited. SU-8 polymer layers were successively built up by spin coating and spectra recorded at each stage; showing a frequency decrease with increasing guiding layer thickness. The insertion loss and frequency dependence as a function of guiding layer thickness was investigated over the first Love Wave mode. Mass loading sensitivity of the resultant Love Wave devices was investigated by deposition of multiple gold layers. Liquid sensing using these devices was also demonstrated; water-glycerol mixtures were used to demonstrate sensing of densityviscosity and the physical adsorption and removal of protein was also assessed using albumin and fibrinogen as model proteins.
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resonant conditions for Love Wave guiding layer thickness
Applied Physics Letters, 2001Co-Authors: Glen Mchale, Michael Newton, Fran Martin, Electra Gizeli, Kathryn A MelzakAbstract:In this work, we report an investigation of polymer overlayer thickness in a Love Wave device working at a fundamental frequency of 110 MHz and at the 330 MHz harmonic. At both frequencies, we observe the initial reduction in insertion loss associated with a Love Wave device. Significantly, we also observe a series of resonant conditions as the layer thickness is further increased. The separation of these resonances is attributed to an increase in thickness of half of the acoustic Wavelength in the polymer.
