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Analysis of a Triangular-shaped Plasmonic Metal-Insulator-Metal Bragg Grating Waveguide
Behnaz Jafarian,Najmeh Nozhat,Nosrat Granpayeh 한국광학회 2011 Current Optics and Photonics Vol.15 No.2
A novel triangular-shaped plasmonic metal-insulator-metal (MIM) Bragg grating waveguide is introduced,whose band-gap is narrower than that of the conventional step type and wider than that of the sawtoothshaped one. Moreover apodized triangular-shaped MIM Bragg grating structures are proposed in order to reduce the side lobes of the transmission spectrum, because the Bragg reflector with a sawtooth profile has a smoother transmission spectrum than that of a triangular-shaped one. The performance of the proposed structures is simulated by using the finite difference time domain method.
Azadeh Karimi,Farzin Emami,Najmeh Nozhat 한국광학회 2014 Current Optics and Photonics Vol.18 No.2
In this paper, four apodization functions are proposed for silicon-on-insulator (SOI) strip waveguides with sidewall-corrugated gratings. The effects of apodization functions on the full width at half maximum (FWHM), the side-lobe level, and the reflectivity of the reflection spectrum are studied using the coupled-mode theory (CMT) and the transfer-matrix method (TMM). The results show that applying proposed apodization functions creates very good filtering characteristics. Among investigated apodized waveguides, the apodization functions of Polynomial and z-power have the best performance in reducing side-lobes, where the side-lobe oscillations are entirely removed. Four functions are also used for precise adjustment of the bandwidth. Simulation results show that the minimum and maximum values of the FWHM are 0.74 nm and 8.48 nm respectively. In some investigated functions, changing the apodization parameters decreases the reflectivity which is compensated by increasing the grating length.