Volume 70, Number 2, April 2005
|Page(s)||197 - 203|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||23 March 2005|
Y-shaped beam splitters for self-collimated beams in 2D photonic crystals
Department of Physics, University of Science and Technology of China Hefei 230026, PRC
2 Department of Physics and Electronic Information Engineering Minjiang University - Fuzhou 350011, PRC
Accepted: 24 February 2005
In this paper, a new Y-shaped beam splitter is designed by combining the partial band gap with self-collimation in a two-dimensional photonic crystal, and the design has been validated by finite-difference time-domain simulation. Simultaneously, we improve the design and enhance the power transmission ratio by inserting an air trench into the incident waveguide. The transmission rises from 24% to 44% at the normalized frequency of 0.185 in each branch, and the maximum transmission ratio within the frequency range of self-collimation reaches 47% at the normalized frequency of 0.187.
PACS: 42.79.Fm – Reflectors, beam splitters, and deflectors / 42.70.Qs – Photonic bandgap materials / 41.85.Si – Beam collimators, monochromators
© EDP Sciences, 2005
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