Power beam splitter based on photonic crystal row of holes and Brewster effect in SOI waveguides

Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Prospect Lavrenteva 13, Novosibirsk 630090, Russia.
Optics Letters (Impact Factor: 3.29). 04/2010; 35(7):968-70. DOI: 10.1364/OL.35.000968
Source: PubMed


This Letter presents a beam splitter in a silicon-on-insulator (SOI) ridge waveguide loaded by a photonic crystal row of holes close to the Brewster angle. The propagation of the fundamental guided mode in this structure has been examined by the three-dimensional finite-difference time-domain method. It is shown that a TE-polarized optical beam exhibits the Brewster effect at an incident angle of about 39 degrees, giving a small splitting ratio (<0.04) in a wide spectral range for silica-filled holes with a typical diameter of 200 nm and a spacing of 300 nm. The row of holes close to the Brewster angle is the perspective to be used in developing complementary metal-oxide semiconductor-compatible tunable devices based on multireflector filtering technology.

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