Proposal for Compact Optical Filters Using Large Index Step Binary Supergratings

Abstract

Compact optical filters are proposed using an aperiodic grating of fixed element size [i.e., a binary supergrating (BSG)] with a large refractive index step. These filters allow for almost arbitrary wavelength filtering, yet they are more compact than previous demonstrations of BSG. The filters are designed using a combination of Boolean particle swarm optimization (B-PSO) and a one-dimensional transfer matrix method. To demonstrate the compact device size, several 50-m-long single-wavelength transmission filters are demonstrated theoretically, each having a different wavelength while using the same structural parameters. A multiwavelength filter is also proposed in an 80-m-long structure to show the versatility of the large refractive index step BSG. A genetic algorithm is substituted for the B-PSO; however, B-PSO shows better performance here. This work may be applied to produce compact optical filters for intrachip optical networks and compact tunable lasers, while using existing single-step photolithography processes.

Directional Emission from Photonic Crystal Waveguide Output by Terminating with CROW and Employing the PSO Algorithm

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Directional emission from photonic crystal waveguide terminations using particle swarm optimization

“…Discrete versions of PSO were also proposed in [9,10]. Though PSO is still in its developmental stages, it has already given some promising results in the domain of photonics in particular and electromagnetics in general [10][11][12][13][14][15].…”

Power circuit design based on PSO optimization

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