Design and Modeling of Semiconductor Terahertz and Infrared Sensing Structures for Protein Characterization


Book Description

Das Gebiet der Bio-Sensorik wird für die Medizin und die biologische Grundlagenforschung immer bedeutender. In diesen Bereichen ist die Untersuchung charakteristischer Eigenschaften von Membranproteinen unerlässlich, da sie die Kommunikation und Aktivität biologischer Zellen verantworten. Darüber hinaus steuern sie den Transport verschiedener Substanzen in die Zelle und eignen sich als Ziel von Medikamenten. Diese Art von Proteinen weisen charakterisitsche Resonanzen zwischen 200GHz und 2 THz auf. In dieser Arbeit wird das Design von gekoppelten plasmonischen THz-Antennen gezeigt. Diese Antennen bestehen aus hochdotiertem Germanium auf einem Siliziumsubstrat und verfügen über eine Resonanzfrequenz von 500 GHz. Sie bieten eine hohe Empfindlichkeit für dünne Schichten in einer wässrigen Lösung und eignen sich für die Charakterisierung von Proteinen im THz-Bereich. Der Entwurf dieser Antennen wird mithilfe von Finite-Elemente-Simulationen durchgeführt. Da solch ein Entwurf einen hohen Rechenaufwand umfasst, wird ein weiterer Ansatz gezeigt. Die plasmonische Antenne wird als RLC-Schwingkreis beschrieben, was Designs mit analytischen Berechnungen ermöglicht. Aufgrund dieser Berschreibung kann eine Anpassung der Impedanz zwischen Antenne und Biomolekül durchgeführt werden, wodurch die Struktur weiter optimiert wird. Neben dem THz-Bereich wird auch der Infrarot-Bereich untersucht. Dort sind Proteinbindungsprozesse zu beobachten. In dieser Arbeit wird eine neuartige Struktur untersucht, um die Brechungsindexdispersion von Proteinen zu messen. Für diese Untersuchung wird ein Array aus Silizium-Mikrosäulen analysiert. Sie zeigen eine hohe Sensitivität für sehr dünne Schichten. Die Ergebnisse dieser Arbeit zeigen, dass sich die untersuchten Sensorstrukturen für die Charakterisierung von Membranproteinen im THz- und Infrarot-Bereich sehr gut eignen. Weiterin sind sie kompatibel zu BiCMOS Prozessen und ermöglichen die kostengünstige Herstellung von Lab-on-Chip Architekturen.




Terahertz Sensing Technology


Book Description

The last research frontier in high frequency electronics lies in the so-called terahertz (or submillimeter wave) regime, between the traditional microwave and the infrared domains. Significant scientific and technical challenges within the terahertz (THz) frequency regime have recently motivated an array of new research activities. During the last few years, major research programs have emerged that are focused on advancing the state of the art in THz frequency electronic technology and on investigating novel applications of THz frequency sensing. This book provides a detailed review of the new THz frequency technological developments that are emerging across a wide spectrum of sensing and technology areas. Volume II presents cutting edge results in two primary areas: (1) research that is attempting to establish THz-frequency sensing as a new characterization tool for chemical, biological and semiconductor materials, and (2) theoretical and experimental efforts to define new device concepts within the OC THz gapOCO. Contents: THz-Frequency Spectroscopic Sensing of DNA and Related Biological Materials (T Globus et al.); Spectroscopy with Electronic Terahertz Techniques for Chemical and Biological Sensing (M K Choi et al.); Terahertz Applications to Biomolecular Sensing (A G Markelz & S E Whitmire); Characteristics of Nano-Scale Composites at THz and IR Spectral Regions (J F Federici & H Grebel); Fundamentals of Terrestrial Millimeter-Wave and THz Remote Sensing (E R Brown); Terahertz Emission Using Quantum Dots and Microcavities (G S Solomon et al.); Terahertz Transport in Semiconductor Quantum Structures (S J Allen & J S Scott); Advanced Theory of Instability in Tunneling Nanostructures (D L Woolard et al.); Wigner Function Simulations of Quantum DeviceOCoCircuits Interactions (H L Grubin & R C Buggeln); Continuous-Wave Terahertz Spectroscopy of Plasmas and Biomolecules (D F Plusquellic et al.). Readership: Undergraduates, graduate students, academics and researchers in engineering and science."













Terahertz Spectroscopy


Book Description

The terahertz regime of the electromagnetic spectrum was largely unexplored due to the lack of technology needed to generate and detect the radiation. However, in the last couple of decades, there has been a dramatic increase in tools needed to harness the radiation. This remarkable progress made in the development of terahertz sources, components, and detectors has resulted in an ever-increasing inquisitiveness of the applications of terahertz technology in a wide range of fields including medicine, pharmaceuticals, security, sensing, and quality assurance. This book, Terahertz Spectroscopy - A Cutting Edge Technology, presents an overview of the recent advances in terahertz technology and their application in a vast array of fields. The scientists and students are encouraged to read and share the content of this volume. The book also provides a good starting point for researchers who are new to the terahertz regime. The various chapters of the book have been written by renowned scientists in different parts of the world who are at the forefront of terahertz research fields. It is our (InTech publisher, editor, and authors) hope that this book will enhance knowledge and stimulate more interest and future research in terahertz technology.




Technology Computer Aided Design


Book Description

Responding to recent developments and a growing VLSI circuit manufacturing market, Technology Computer Aided Design: Simulation for VLSI MOSFET examines advanced MOSFET processes and devices through TCAD numerical simulations. The book provides a balanced summary of TCAD and MOSFET basic concepts, equations, physics, and new technologies related to TCAD and MOSFET. A firm grasp of these concepts allows for the design of better models, thus streamlining the design process, saving time and money. This book places emphasis on the importance of modeling and simulations of VLSI MOS transistors and TCAD software. Providing background concepts involved in the TCAD simulation of MOSFET devices, it presents concepts in a simplified manner, frequently using comparisons to everyday-life experiences. The book then explains concepts in depth, with required mathematics and program code. This book also details the classical semiconductor physics for understanding the principle of operations for VLSI MOS transistors, illustrates recent developments in the area of MOSFET and other electronic devices, and analyzes the evolution of the role of modeling and simulation of MOSFET. It also provides exposure to the two most commercially popular TCAD simulation tools Silvaco and Sentaurus. • Emphasizes the need for TCAD simulation to be included within VLSI design flow for nano-scale integrated circuits • Introduces the advantages of TCAD simulations for device and process technology characterization • Presents the fundamental physics and mathematics incorporated in the TCAD tools • Includes popular commercial TCAD simulation tools (Silvaco and Sentaurus) • Provides characterization of performances of VLSI MOSFETs through TCAD tools • Offers familiarization to compact modeling for VLSI circuit simulation R&D cost and time for electronic product development is drastically reduced by taking advantage of TCAD tools, making it indispensable for modern VLSI device technologies. They provide a means to characterize the MOS transistors and improve the VLSI circuit simulation procedure. The comprehensive information and systematic approach to design, characterization, fabrication, and computation of VLSI MOS transistor through TCAD tools presented in this book provides a thorough foundation for the development of models that simplify the design verification process and make it cost effective.




Visualizing Chemistry


Book Description

Scientists and engineers have long relied on the power of imaging techniques to help see objects invisible to the naked eye, and thus, to advance scientific knowledge. These experts are constantly pushing the limits of technology in pursuit of chemical imagingâ€"the ability to visualize molecular structures and chemical composition in time and space as actual events unfoldâ€"from the smallest dimension of a biological system to the widest expanse of a distant galaxy. Chemical imaging has a variety of applications for almost every facet of our daily lives, ranging from medical diagnosis and treatment to the study and design of material properties in new products. In addition to highlighting advances in chemical imaging that could have the greatest impact on critical problems in science and technology, Visualizing Chemistry reviews the current state of chemical imaging technology, identifies promising future developments and their applications, and suggests a research and educational agenda to enable breakthrough improvements.




Terahertz Frequency Detection and Identification of Materials and Objects


Book Description

Want an overview of where the technology of terahertz detection has been going? Here it is. The technology has largely been developed around expensive and bulky femtosecond laser systems but, as described in this book, advances in semiconductor superlattice technology are leading to compact "electronic" sources such as the quantum cascade laser, two-terminal "Gunn" type oscillators and even a THz frequency amplifier. These advances towards electronic (as opposed to optical) THz systems mean that the technology will become portable and much less costly.




Plasmonics: Fundamentals and Applications


Book Description

Considered a major field of photonics, plasmonics offers the potential to confine and guide light below the diffraction limit and promises a new generation of highly miniaturized photonic devices. This book combines a comprehensive introduction with an extensive overview of the current state of the art. Coverage includes plasmon waveguides, cavities for field-enhancement, nonlinear processes and the emerging field of active plasmonics studying interactions of surface plasmons with active media.