We revisited the fundamental problem of bending loss calculation in optical waveguide theory using transformation optics (TOs). Due to the fact that TOs is based on the form invariance property of Maxwell equations, this new approach provides more accurate calculation of waveguide bending loss compared to the conventional refractive index conformal mapping method, especially for small bending radii typical for plasmonic waveguides or photonic waveguides with high-index contrast. We believe our results provide a simple yet reliable way of bending loss calculation for highly confined optical (including plasmonic) waveguides.
© 2013 Optical Society of America
Original Manuscript: February 25, 2013
Revised Manuscript: April 10, 2013
Manuscript Accepted: April 19, 2013
Published: May 20, 2013
Zhanghua Han, Pu Zhang, and Sergey I. Bozhevolnyi, "Calculation of bending losses for highly confined modes of optical waveguides with transformation optics," Opt. Lett. 38, 1778-1780 (2013)