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Active Metamaterials: Terahertz Modulators and Detectors by Saroj Rout, Sameer Sonkusale

By Saroj Rout, Sameer Sonkusale

This publication covers the theoretical history, experimental equipment and implementation info to engineer for communique and imaging program, terahertz units utilizing metamaterials, in mainstream semiconductor foundry strategies. This booklet will supply engineers and physicists an authoritative connection with build such units with minimum heritage. The authors describe the layout and development of electromagnetic (EM) units for terahertz frequencies (108-1010 cycles/sec) utilizing synthetic fabrics which are a fragment of the wavelength of the incident EM wave, leading to an effective electric and magnetic houses (permittivity and permeability) which are unavailable in average materials.

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C. Rockstuhl, C. Menzel, T. Paul, T. Pertsch, F. Lederer, Phys. Rev. B 78(15), 155102 (2008) 24 1 Introduction 108. J. Valentine, S. Zhang, T. Zentgraf, E. A. Genov, G. Bartal, X. Zhang, Nature 455(7211), 376 (2008) 109. D. Shrekenhamer, W. Xu, S. Venkatesh, D. Schurig, S. J. Padilla, Phys. Rev. Lett. 109(17), 177401 (2012) 110. D. Li, Y. Xie, J. Zhang, J. Li, Z. Chen, J. Electromagn. Waves Appl. 22(10), 1420 (2008) 111. C. Rockstuhl, T. Zentgraf, H. Guo, N. Liu, C. Etrich, I. Loa, K. Syassen, J.

Except for a narrow region around the resonance, r0 increases with frequency called the normal dispersion. In the narrow region of the resonance it decreases with frequency called anomalous dispersion. This region is also the frequency interval of maximum absorption as will be shown later in this section. The width of this region is equal to the loss factor . t/ p However, the wave number k D ! 34) is complex. 36) 34 2 Background Theory Fig. /= 0 in the neighborhood of a resonance. The region of anomalous dispersion is also the frequency interval for the maximum absorption Evidently, ˛=2 measures the attenuation of the wave.

THz-TDS system is based on single-cycle bursts of electromagnetic transients generated opto-electronically using femtosecond duration laser pulses. Typically, the single-cycle burst are of 1 ps duration whose spectral density spans from near 100 GHz to above 5 THz. Optically gated detection allows direct sampling of the generated terahertz wave with sub-picosecond accuracy. From this measurement, the real and imaginary part of the dielectric function of the medium can be extracted without the use of Kramers-Kronig relation (Eq.

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