DCMPMS Seminars

Wave-Periodic Structure interaction at Tera-Hertz (THz) frequency regime

by Mr. Arnab Pattanayak (Indian Institute of Technology Bombay, Mumbai)

Tuesday, November 13, 2018 from to (Asia/Kolkata)
at AG80
Description
Wish to manipulate photons akin to our ability of controlling electrons in solid-state devices has opened new frontiers of Electromagnetics [1]. Novel active and passive RF/photonic devices have been explored in order to collimate photons in far-field, confine them in sub-wavelength volume and bend their route at will. Such exotic phenomena can be yielded through the interaction of plane wave with sub-wavelength resonators arranged in symmetric or asymmetric ordination. These phenomena are employed in wide range of applications from wireless communication to molecular spectroscopy. The beauty of the nature is - these various phenomena across the whole range of electromagnetic spectrum are governed by the same Maxwell’S equation. This seminar will focus on wave-periodic structure interaction in THz regime. THz frequency range (0.1-1 THz) is called ``Last Frontier of EM spectrum'' [2]. Efficient generation and detection of THz signal has opened this band for novel applications like sensing, non-destructive imaging and high speed wide band wireless power transfer. These applications demand new additional devices for the fine controlling over THz wave propagation. Realization of novel engineered THz structures requires clear understanding of their interaction mechanisms with THz signal. In this seminar, to address these issues we will demonstrate periodic structures for efficient absorption and transmission of THz wave, respectively.

References
[1] 	Thomas W Ebbesen, H J Lezec, HF Ghaemi, Tineke Thio, and PA Wolff. Extraordinary optical transmission through sub-wavelength hole arrays. Nature, 391(6668):667, 1998.
[2] 	Craig Kulesa. Terahertz spectroscopy for astronomy: From comets to cosmology. IEEE Transactions on Terahertz Science and Technology, 1(1):232-240, 2011.