Abstract
In this paper, a five channel drop filter has been designed in a two dimensional photonic crystal with high dielectric rods in air. Each channel consists of a photonic crystal coupled cavity waveguide with double cavities combined with a line defect waveguide. Desired wavelengths are selected by setting different radii of the two point defects in the photonic crystal coupled cavity waveguides. Defect rods placed at the same channel have an identical radius. The performance of the designed (...)
Highlights
Photonic crystals (PCs) are envisaged as the main candidates for developing microscale integrated light wave circuits because of their properties for controlling the flow of light on a very small scale [1, 2]
A five channel drop filter has been designed in a two dimensional photonic crystal with high dielectric rods in air
The band gap of the perfect PC exists in the frequency ranges of 0.287-0.420 (a/λ), where λ is the wavelength in free space, which corresponds to wavelength range 1.152-1.686 μm for the waves with transverse magnetic (TM) polarization
Summary
Photonic crystals (PCs) are envisaged as the main candidates for developing microscale integrated light wave circuits because of their properties for controlling the flow of light on a very small scale [1, 2]. It is possible to construct microcavities that can localize photons in extremely small volumes Combinations of these defects in photonic crystals structures give rise to a novel phenomena such us the trapping and emission of photons and the tunneling and channeling of photons [3, 4]. These defects are expected to be key building blocks for miniature photonic functional devices and photonic integrated circuits (PICs).Various optical devices can be realized based on PCs such as optical switches [5], band pass filters [6], band stop filters [7], splitters [8], demultiplexers [9], polarizers [10] and directional couplers [11]. Ultra-compact channel drop filters (CDFs) based on resonant coupling between cavity modes of point defects and waveguide modes of line defects have drawn primary interest due to their substantial demand in wavelength division multiplexing (WDM) optical communication systems
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