Abstract This paper proposes a tunable filter composed of semiconductor-insulator-semiconductor (SIS) waveguide with ring resonator at terahertz(THz) frequency. The two-dimensional study the proposed structure has been done using finite element method. It is observed that device can be used for filtering THz frequency within range 0.4 to 0.9 by varying structural parameters. simulated promising...

In this paper, an optical filter based on a two dimensional photonic crystalring resonator (PCRR) with triangular lattice is designed and presented. For thispurpose, the effects of positioning, arrangement and the number of the inner rods of thedual-curved PCRR on the performance characteristics of our optical filter such as thetransmission coefficient and the quality factor have been fully inv...

This paper shows an improved particle swarm optimization (PSO) to design a novel compact ultra wideband (UWB) filter. The filter consists of an only one-cell composite right and left handed-transmission line (CRLH-TL) resonator, stepped impedance (SI), and two spurlines. The one-cell CRLH-TL resonator has a compact size and forms a wide passband. An SI and two spurlines are employed to reject b...