By Balamati Choudhury, Arya Menon, Rakesh Mohan Jha
This publication describes a metamaterial-based lively absorber for capability biomedical engineering functions. Terahertz (THz) spectroscopy is a vital software for imaging within the box of biomedical engineering, as a result of the non-invasive, non-ionizing nature of terahertz radiation coupled with its propagation features in water, which permits the operator to acquire high-contrast photographs of epidermis cancers, burns, and so forth. with no hazardous results. with a view to faucet this massive capability, it is very important construct hugely effective biomedical imaging structures through introducing terahertz absorbers into biomedical detectors. the most important problem confronted within the fulfilment of this aim is the shortcoming of clearly happening dielectrics, that is triumph over with using artificially engineered resonant fabrics, viz. metamaterials. This booklet describes the sort 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 cohesion absorption for a tuning variety of terahertz (THz) application.
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Extra info for Active Terahertz Metamaterial for Biomedical Applications
H. Gregersen, O. W. Ziolkowski, and O. Breinbjerg. 2013. A review of the scattering parameter extraction method with References 39 clariﬁcation of ambiguity issues in relation to metamaterial homogenization. IEEE Antennas and Propagation Magazine 55(2): 91–106. , P. P. Jarzab, K. Nowak, E. F. Plinski, M. J. Walczakowski, and J. S. Witkowski. 2012. Dielectric properties of the FR-4 substrates in the THz frequency range. , Sept. 2012. , C. Wu, H. Li, and J. Zhai. 2014. A tunable metamaterial dependent on electric ﬁeld at terahertz with barium strontium titanate thin ﬁlm.
7 μm. 01 μm. 1 μm was assigned to the ring with a polyimide dielectric support placed behind it. The absorption at 2 THz for the structure shown in Fig. 93 % as shown in Fig. 23. On close observation, it is seen that for practical, rugged applications, the space above and below the CSRR must be ﬁlled with a material without properties similar to air such as Styrofoam. PSO for Absorber Design: Manually determining the dimensions of the metamaterial and additional substrate layer for heighted absorption is a time-consuming and iterative task, and requires a lot of effort by the design.
G. Roh, S. Cheon, C. Lee, W. 2011. Tunable terahertz metamaterial based on resonant dielectric inclusions with disturbed Mie resonance. Applied Physics A: Material Science and Processing, pp. 465–470. , and S. M. Kim. 2013. Terahertz metamaterial absorbers for sensing and imaging. Proceedings of Progress in Electromagnetics Research Symposium, pp. 232–235, Taipei. X. Z. Y. W. Sun. 2012. A symmetrical dual-band terahertz meta-material with cruciform and square loops. Progress in Electromagnetics Research C 33: 259–267.