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Download e-book for kindle: Active Terahertz Metamaterial for Biomedical Applications by Balamati Choudhury, Arya Menon, Rakesh Mohan Jha

By Balamati Choudhury, Arya Menon, Rakesh Mohan Jha

This ebook describes a metamaterial-based energetic absorber for capability biomedical engineering functions. Terahertz (THz) spectroscopy is a vital software for imaging within the box of biomedical engineering, as a result non-invasive, non-ionizing nature of terahertz radiation coupled with its propagation features in water, which permits the operator to procure high-contrast pictures of dermis cancers, burns, and so on. with no dangerous results. with the intention to faucet this large power, you will need to construct hugely effective biomedical imaging structures via introducing terahertz absorbers into biomedical detectors. the most important problem confronted within the fulfilment of this aim is the inability of clearly taking place dielectrics, that's triumph over with using artificially engineered resonant fabrics, viz. metamaterials. This ebook describes one of these metamaterial-based energetic absorber. The layout has been optimized utilizing particle swarm optimization (PSO), ultimately leading to an ultra-thin lively terahertz absorber. The absorber exhibits close to solidarity absorption for a tuning diversity of terahertz (THz) application.

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However, due to the resonant nature of the SRR, a frequency tuning mechanism must be introduced in order to develop a robust, practical design. 1 Selection of Tuning Mechanism Both thermal excitation and photoexcitation are not feasible from the view of integration with bolometric detectors as these energies might appear as noise to the detector. Electrical actuation involves changing the properties of the substrate through bias voltages. This would require specialized materials to be used as substrate such as barium strontium titanate (BST) (Bian et al.

2 Background Theory 15 Abundant literature is available for implementation of genetic algorithm and micro-genetic algorithm for RAM optimization. Chakravarty et al. (2001) used the same in order to design a frequency selective surface (FSS) based broadband microwave absorber. The work also shows that implementation of micro-genetic algorithm over genetic algorithm considerably speeds up the computation time. The algorithm was designed to simultaneously select the best materials and their thicknesses as well as vary the structural parameters of the FSS for optimized performance.

C. Wu, H. Li, and J. Zhai. 2014. A tunable metamaterial dependent on electric field at terahertz with barium strontium titanate thin film. Applied Physics Letters 104: 042906-1– 042906-4. Butler, L. A. 2012. Design, simulation, fabrication, and characteristics of terahertz metamaterial. , University of Alabama. Caloz, C. 2006. Electromagnetic metamaterials: transmission line theory and microwave applications. Hoboken: Wiley. ISBN-10: 0-471-66985-7, 350pp. , R. R. Williams. 2001. On the application of the microgenetic algorithm to the design of broad-band microwave absorbers comprising frequency-selective surfaces embedded in multilayered dielectric media.

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