By Balamati Choudhury, Arya Menon, Rakesh Mohan Jha

This ebook describes a metamaterial-based lively absorber for strength biomedical engineering purposes. Terahertz (THz) spectroscopy is a vital software for imaging within the box of biomedical engineering, because of the 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 epidermis cancers, burns, and so on. with no dangerous results. so one can faucet this massive power, you will need to construct hugely effective biomedical imaging structures through introducing terahertz absorbers into biomedical detectors. the largest problem confronted within the fulfilment of this aim is the shortcoming of evidently happening dielectrics, that's triumph over with using artificially engineered resonant fabrics, viz. metamaterials. This publication describes this type of metamaterial-based energetic absorber. The layout has been optimized utilizing particle swarm optimization (PSO), finally leading to an ultra-thin lively terahertz absorber. The absorber exhibits close to harmony absorption for a tuning variety of terahertz (THz) application.

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Mridula, and P. Mohanan. 2011. Design of an edge–coupled dual-ring split-ring resonator. IEEE Antennas and Propagation Magazine 53(4). , K. I. Smalyukh, and W. Park. 2009. Tunable optical metamaterial based on liquid crystal-gold nanosphere composite. Optics Express 17(22): 19459–19469. , and J. Y. Siddiqui. 2009. Estimation of the resonance frequency of the conventional and rotational circular split ring resonators. Proceedings of Applied Electromagnetics Conference (AEMC), pp. 1–3, Dec. 2009.

10 and 11. The simulated results were found to match with those given in this chapter. 2 Design of Terahertz Metamaterials Using Scaling Scaling is a popular technique for design of metamaterials and has been extensively reported in the literature. This is accomplished by scaling all dimensions in the metamaterial according to the wavelength of operation. 005 22 Active Terahertz Metamaterial for Biomedical Applications Fig. 9 Schematic of designed metamaterial. a Front view and b back view of metamaterial (a) (b) 4 7 6 2 Permeability (μ) Permittivity (εε) 5 0 -2 -4 -6 -8 3 2 1 0 -1 -10 -12 4 -2 6 8 14 10 12 Frequency in GHz 16 18 -3 6 8 10 12 14 Frequency in GHz 16 18 Fig.

The design has been optimized using particle swarm optimization (PSO), eventually resulting in an ultra-thin active terahertz absorber. The absorber shows near unity absorption for a tuning range of terahertz (THz) application. © The Author(s) 2016 B. , 12 © The Author(s) 2016 B. F, 12 Smalyukh, I. , 12 Subject Index A Absorber design, 24 Active absorber array, 33 Adaptive tuning, 4 fitness, 15 global best, 15 particle, 15 personal best, 15 B Biomedical imaging, 3 R Resonant metamaterials, 9 C Circular split ring resonator, 29 S S-parameter retrieval, 18 permeability, 18 permittivity, 18 M Metamaterial absorbers, 13 Metamaterials, 6 group velocity, 8 left-handed materials, 7 phase velocity, 8 transmission line equivalent, 7 N Non-resonant metamaterials, 9 T Terahertz instruments, 5 Terahertz radiation, 2 Terahertz region, 1 Terahertz time domain spectroscopy, 5 Tuning mechanism, 11, 33 electrical actuation, 12 photoexcitation actuation, 12 thermal actuation, 12 P Particle swarm optimization, 14 © The Author(s) 2016 B.

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