Abstract

Ultracompact waveguide bends with simple topology in two-dimensional photonic crystal slabs are proposed by using an annular air groove at the bend corner to improve transmissions of the bends. Analysis indicates that the guided light wave experiences a very slight difference of propagation properties between straight waveguides and bends (with $60°$ and $120°$ bending angles). Transmissions of more than 90% can be achieved in the $60°$ and $120°$ bends for light waves at $1.55\mathrm{\mu }\mathrm{m}$ with bandwidths of 101 and $74\mathrm{nm}$, respectively.

© 2007 Optical Society of America

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