Mitali Sahu

IIT kharagpur, India

Frequency Selective Surface for Third Harmonic Generation Using Split Ring Resonator at THz Frequencies

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Biography

Abstract

Abstract: We report here new designs of frequency selective surface (FSS) metamaterials composed of patterned split-ring resonators (SRR) to obtain third harmonic generation (THG) at THz frequencies. The efficient THG is obtained by aligning the fundamental (?) and third harmonic (3?) frequencies with the resonance of our proposed metasurface structure, leading to energy confinement in both steps of excitation at ? (3.7 THz) and radiation at 3? (11.1 THz), with an input intensity of 0.4MW/cm^2. SRRs are used in the proposed structure because of their high sensitivities to electromagnetic waves.

Summary: The proposed THz FSS device, made from symmetric SRRs of MM, which are periodic structures with a band pass frequency response. The geometry of the nonlinear FSS is shown in fig. 1. A split ring slot is patterned on a geometrically thin copper layer that sits on a thin nonlinear dielectric layer substrate with the design parameters. The incident fundamental wave is TM polarised in order the proposed FSS to resonate at normal incidence with low intensity, with magnetic field along y-axis. The resonant response and the field enhancement caused by the proposed FSS are shown in fig. 2a and 2b respectively. The mode field distributions plot is also inserted in fig. 2b.