Theoretical And Experimental Investigations To Improve The Performance Of Surface Acoustic Wave Saw Biosensors PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Theoretical And Experimental Investigations To Improve The Performance Of Surface Acoustic Wave Saw Biosensors PDF full book. Access full book title Theoretical And Experimental Investigations To Improve The Performance Of Surface Acoustic Wave Saw Biosensors.
| Author | : Mandek Richardson |
| Publisher | : |
| Total Pages | : |
| Release | : 2015 |
| Genre | : Biogeochemistry |
| ISBN | : |
Download Theoretical And Experimental Investigations To Improve The Performance Of Surface Acoustic Wave (SAW) Biosensors Book in PDF, ePub and Kindle
The objective of this dissertation is to improve the performance of surface acoustic wave (SAW) biosensors for use in point-of-care-testing (POCT) applications. SAW biosensors have the ability to perform fast, accurate detection of an analyte in real time without the use of labels. However, the technology suffers from the inability to differentiate between specific and non-specific binding. Due to this limitation, direct testing of bodily fluids using SAW sensors to accurately determine an analyte's concentration is difficult. In addition, these sensors are challenged by the need to detect small concentrations of a biomarker that are typically required to give a clinical diagnosis. Sensitivity, selectivity and reliability are three critical aspects for any sensing platform. To improve sensitivity the delay path of a SAW sensor has been modified with microcavities filled with various materials. These filled cavities increased sensitivity by confining wave energy to the surface by way of constructive interference and waveguiding. Thus, the improved sensitivity will result in a lower limit of detection. In addition, insertion loss is decreased as a consequence of increased wave confinement to the surface. Sensor selectivity and reliability are adversely affected by non-specific binding of unwanted species present in a sample. To address this issue a multifunctional SAW sensor is presented. The sensor consists of two SAW delay lines oriented orthogonal to each on ST-quartz in order to generate two distinct wave modes. One wave mode is used for sensing while the other is used to remove loosely bound material. By using the same transduction mechanism for both removal and sensing, the sensor chip is simplified and complex electronics are avoided. The findings of this research involve the technological advances for SAW biosensors that make their use in POCT possible.
| Author | : Sang Hun Lee |
| Publisher | : |
| Total Pages | : |
| Release | : 2006 |
| Genre | : Acoustic surface waves |
| ISBN | : |
Download Theoretical and Experimental Characterization of Time-dependent Signatures of Acoustic Wave Based Biosensors Book in PDF, ePub and Kindle
The object of this thesis research is to facilitate the appraisal and analysis of the signatures of the modern acoustic wave biosensors, as well as to improve the experimental methodology to enhance sensor performance. For this purpose, both theoretical characterization of acoustic wave sensor signatures and experimental studies for the most frequently used acoustic wave biosensors, the liquid phase QCM (quartz crystal microbalance) and the vapor phase SAW (surface acoustic wave) sensors, are presented. For the study of SAW vapor phase detection, the author fabricated different types of two-port SAW resonator sensors on quartz substrates and designed and performed a significant number of detection experiments. These were conducted both with calibrated or known target samples under laboratory conditions at Georgia Tech Hunt Lab and with samples of unknown concentrations such as seized crack cocaine (courtesy of Georgia Bureau of Investigation, GBI) to see the sensors capability to work in the field conditions. In addition, the dependence of the SAW sensor signatures on specific locations of the surface perturbation was investigated to account for some observed abnormal responses. Finally, a novel approach to classify and visualize chemically analogous substances is introduced. The author expects that the thesis work herein may contribute to the study of the modern acoustic wave biosensors which includes but is not limited to: the establishment of underpinning theory that will aid in the evaluation of the signatures; the practical aspects of design and fabrication of SAW devices specific to the vapor phase immunoassay; the development of efficient experimental methodologies; the strategic immobilization of a biolayer on SAW resonator based biosensors; and, the acquisition of reference data for the development of commercial acoustic wave sensors.
| Author | : Mohamed M. T. E. L. Gowini |
| Publisher | : |
| Total Pages | : 207 |
| Release | : 2015 |
| Genre | : Acoustic surface wave devices |
| ISBN | : |
Download Theoretical and Experimental Investigation on the Use of Surface Acoustic Wave Sensors for Evaluating the Adhesion of SU-8 Thin Films Book in PDF, ePub and Kindle
This research investigates the use of a SU-8/AlN/Si SAW sensor for evaluating the adhesion of SU-8 thin films. A theoretical model is developed to plot the wave dispersion profile for the SU-8/AlN/Si configuration. A spring interface model is utilized to represent the SU-8/AlN interface using a series of massless springs with stiffness K (N/m^3). The value of the interface spring stiffness K is changed to represent different levels of SU-8 adhesion. The wave dispersion profiles for the intermediate adhesion levels are plotted using the theoretical model. The change in wave velocity due to the change in adhesion of the SU-8 thin film is evaluated. The sensitivities of different configurations of the SU-8/AlN/Si SAW sensors are investigated. Four SAW sensor designs are selected to evaluate the adhesion of the SU-8 thin film. The four SAW sensors operate in the frequency range of 84-208MHz. A process flow for fabricating the SAW sensors at the University of Alberta micro-and nanofabrication facility "nanofab" is developed. The fabricated sensors are packaged using wire bonding to allow measurement of their frequency responses using a Vector Network Analyzer. For each of the four SAW sensor designs two sensor configurations will be developed. In one configuration the SU-8 film will be patterned on top of a thin gold film on the surface of the AlN/Si layers and in the second configuration the gold film will be coated with an Omnicoat layer prior to patterning the SU-8 film. Omnicoat is an adhesion promoter that is widely used to improve the adhesion of SU-8 to gold. The frequency responses from both sensor configurations are measured for each of the four SAW sensor designs and the frequency shift is evaluated. The frequency shift illustrates the change in adhesion of the SU-8 film with and without omnicoat. The phase velocity values also shift to a higher value for the sensor configurations without omnicoat. As the adhesion of the SU-8 film drops in the absence of omnicoat the stresses transferred to the SU-8 layer drop and accordingly the wave propagation is concentrated in the AlN/Si layers, which have a higher wave velocity than SU-8. However, in the presence of omnicoat the adhesion of the SU-8 layer improves and the surface acoustic wave propagates in the SU-8 layer, which leads to a drop in the phase velocity. The theoretical model is used to find the equivalent interface spring stiffness values for the two cases of SU-8 adhesion i.e. with and without omnicoat. This is accomplished by curve fitting the dispersion curves to the phase velocity values for from both sensor configurations. The equivalent interface spring stiffness values are found to be 8.0992 x10^9 N/m^3 and 7.9492x10^9 N/m3 for the SAW sensors with omnicoat and without omnicoat, respectively. These values indicate that when omnicoat is used as an adhesion promoter for SU-8 the interface spring stiffness increases due to the improved adhesion. However, without omnicoat the adhesion of the SU-8 layer drops, which corresponds to the lower interface spring stiffness value.
| Author | : Colin Campbell |
| Publisher | : Elsevier |
| Total Pages | : 485 |
| Release | : 2012-12-02 |
| Genre | : Technology & Engineering |
| ISBN | : 0323148662 |
Download Surface Acoustic Wave Devices and Their Signal Processing Applications Book in PDF, ePub and Kindle
Surface Acoustic Wave Devices and Their Signal Processing Applications is a textbook that combines experiment and theory in assessing the signal processing applications of surface acoustic wave (SAW) devices. The operating principles of SAW devices are described from a circuit design viewpoint. This book is comprised of 18 chapters and begins with a historical background on surface acoustic waves and a discussion on the merits of SAW devices as well as their applications. The next chapter introduces the reader to the basics of acoustic waves and piezoelectricity, together with the effect of acoustic bulk waves on the performance of SAW filters. The principles of linear phase SAW filter design and equivalent circuit models for a SAW filter are then described. The remaining chapters focus on trade-offs in linear phase SAW filter design; compensation for second-order effects; harmonic SAW delay lines for gigahertz frequencies; and coding techniques using linear SAW transducers. The final chapter highlights Some other significant alternative design techniques and applications for SAW devices. This monograph will be suitable for engineering or physics students as well as engineers, scientists, and technical staff in industry who seek further information on SAW-based circuits, systems, and applications.
| Author | : Clemens C. W. Ruppel |
| Publisher | : World Scientific |
| Total Pages | : 380 |
| Release | : 2001 |
| Genre | : Science |
| ISBN | : 9789812811561 |
Download Advances in Surface Acoustic Wave Technology, Systems and Applications Book in PDF, ePub and Kindle
Surface acoustic wave (SAW) devices are recognized for their versatility and efficiency in controlling and processing electrical signals. This has resulted in a multitude of device concepts for a wide range of signal processing functions, such as delay lines, filters, resonators, pulse compressors, convolvers, and many more. As SAW technology has found its way into mass market products such as TV receivers, pagers, keyless entry systems and cellular phones, the production volume has risen to millions of devices produced every day. At the other end of the scale, these are specialized high performance signal processing SAW devices for satellite communication and military applications, such as radar and electronic warfare. This volume, together with Volume 1, presents an overview of recent advances in SAW technology, systems and applications by some of the foremost researchers in this exciting field. Contents: Coupling-of-Modes Analysis of SAW Devices (V Plessky & J Koskela); Theory and Applications of Green''s Functions (A R Baghai-Wadji); New Piezoelectric Substrates for SAW Devices (J Kosinski); Pseudo and High Velocity Pseudo SAWs (M P da Cunha); SAW Devices Beyond 5 GHz (H Odagawa & K Yamanouchi); Wireless SAW Identification and Sensor Systems (F Schmidt & G Scholl); Interaction of Surface Acoustic Waves, Electrons, and Light (A Wixforth). Readership: Graduate students, researchers and academics in device and circuit design, as well as designers of mobile communications systems.
| Author | : Tor A Fjeldly |
| Publisher | : World Scientific |
| Total Pages | : 325 |
| Release | : 2000-09-29 |
| Genre | : Technology & Engineering |
| ISBN | : 981449240X |
Download Advances In Surface Acoustic Wave Technology, Systems And Applications (Volume 1) Book in PDF, ePub and Kindle
Surface acoustic wave (SAW) devices are recognized for their versatility and efficiency in controlling and processing electrical signals. This has resulted in a multitude of device concepts for a wide range of signal processing functions, such as delay lines, filters, resonators, pulse compressors, convolvers, and many more. As SAW technology has found its way into mass market products such as TV receivers, pagers, keyless entry systems and cellular phones, the production volume has risen to millions of devices produced every day. At the other end of the scale, there are specialized high performance signal processing SAW devices for satellite communication and military applications, such as radar and electronic warfare.This volume, together with Volume 2, presents an overview of recent advances in SAW technology, systems and applications by some of the foremost researchers in this exciting field.
| Author | : Valeri G. Dneprovski |
| Publisher | : Nova Science Publishers |
| Total Pages | : 0 |
| Release | : 2016 |
| Genre | : Acoustic surface wave devices |
| ISBN | : 9781634853682 |
Download Surface Acoustic Wave Devices Book in PDF, ePub and Kindle
Surface acoustic waves (SAWs) demonstrate simplicity of their excitation and receipt, as well as their availability to all propagation ways of signal branching and processing. SAW devices are divided into several main classes: filters for signal processing at intermediate frequencies, delay lines, resonators, filters with low losses for the input circuits of receiver, and antenna duplexers for the connected receivers. The SAW devices are not only able to conduct an effective signal processing, but also serve as a basis for multi-subsystems (matched filtering, signal processing, real-time Fourier transform processors, etc.). Additionally, SAW filters help scientists to realise the wide variety of frequency characteristics. Besides their unique electrical characteristics, SAW devices favorably differ from their analogs in small size, mechanical strength and high reliability, due to the quality of raw materials and their processing. The use of the photolithography and the achievements of group microelectronic technology in their production allow a researcher to achieve good reproducibility of parameters at relatively low cost. In addition, currently SAW devices are widely used in various sensors based on the SAW radio frequency identification. This book presents an attempt to generalise a multi-year experience on R&D of SAW devices. It develops original approaches directed at discovering solutions of technical problems, as development of various SAW devices are patented in Russia. Moreover, the book presents some experimental and theoretical research results.
| Author | : Jaroslaw Konopka |
| Publisher | : |
| Total Pages | : 306 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Download Theoretical and Experimental Investigation of Guided Acoustic Waves in the GHz Range Book in PDF, ePub and Kindle
| Author | : Joseph Andrew Petrus |
| Publisher | : |
| Total Pages | : 286 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download A Computational and Experimental Study of Surface Acoustic Waves in Phononic Crystals Book in PDF, ePub and Kindle
The unique frequency range and robustness of surface acoustic wave (SAW) devices has been a catalyst for their adoption as integral components in a range of consumer and military electronics. Furthermore, the strain and piezoelectric fields associated with SAWs are finding novel applications in nanostructured devices. In this thesis, the interaction of SAWs with periodic elastic structures, such as photonic or phononic crystals (PnCs), is studied both computationally and experimentally. To predict the behaviour of elastic waves in PnCs, a finite-difference time-domain simulator (PnCSim) was developed using C++. PnCSim was designed to calculate band structures and transmission spectra of elastic waves through two-dimensional PnCs. By developing appropriate boundary conditions, bulk waves, surface acoustic waves, and plate waves can be simulated. Results obtained using PnCSim demonstrate good agreement with theoretical data reported in the literature. To experimentally investigate the behaviour of SAWs in PnCs, fabrication procedures were developed to create interdigitated transducers (IDTs) and PnCs. Using lift-off photolithography, IDTs with finger widths as low as 1.8 um were fabricated on gallium arsenide (GaAs), corresponding to a SAW frequency of 397 MHz. A citric acid and hydrogen peroxide wet-etching solution was used to create shallow air hole PnCs in square and triangular lattice configurations, with lattice constants of 8 um and 12 um, respectively. The relative transmission of SAWs through these PnCs as a function of frequency was determined by comparing the insertion losses before and after etching the PnCs. In addition, using a scanning Sagnac interferometer, displacement maps were measured for SAWs incident on square lattice PnCs by Mathew (Creating and Imaging Surface Acoustic Waves on GaAs, Master's Thesis). Reasonable agreement was found between simulations and measurements. Additional simulations indicate that SAW waveguiding should be possible with a PnC consiting of air holes in GaAs. The phononic properties of a commonly used photonic plate were also determined. Band structure simulations of the plate displayed no complete elastic band gaps. However, transmission simulations indicated that a pseudo-gap may form for elastic waves polarized in the sagittal plane.
| Author | : Ken-Ya Hashimoto |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 352 |
| Release | : 2000-06-21 |
| Genre | : Technology & Engineering |
| ISBN | : 9783540672326 |
Download Surface Acoustic Wave Devices in Telecommunications Book in PDF, ePub and Kindle
Surface acoustic wave (SAW) devices are widely used in mobile communications, a rapidly evolving market. This book gives an overview on the latest SAW technologies with an emphasis on the design and simulation of devices, such as resonator-based devices employing the SH-type leaky SAW.
