Abstract

The design of an optical waveguide coupler has several challenges, such as reflection losses at the interfaces of the coupler, material complexity for optical applications, and the coupling between arbitrary materials at the input and the output of the coupler. In this paper, for the first time to the best of our knowledge, we propose a solution to overcome the above difficulties. For this purpose, we introduce an auxiliary transformation function and an impedance scaling function. The auxiliary function specifies the matched dielectric materials at the input and output interfaces of the coupler, and the scaling function suppresses the reflections and makes the material nonmagnetic for transverse magnetic (TM) polarization. As a result, an optical waveguide coupler is designed that can ideally couple two waveguides with arbitrary dielectric materials and arbitrary cross sections using a nonmagnetic material. Validation of the design method is done by using COMSOL Multiphysics.

© 2017 Optical Society of America

Reflectionless design of a nonmagnetic homogeneous optical waveguide coupler based on transformation optics

Hossein Eskandari, Amir Reza Attari, and Mohammad Saeed Majedi
J. Opt. Soc. Am. B 35(1) 54-60 (2018)

Transformation optics for perfect two-dimensional non-magnetic all-mode waveguide couplers

Hossein Eskandari, Oscar Quevedo-Teruel, Amir Reza Attari, and Mohammad Saeed Majedi
Opt. Mater. Express 9(3) 1320-1332 (2019)

Design of reflectionless non-magnetic homogeneous polarization splitters with minimum anisotropy based on transformation electromagnetics

Hossein Eskandari, Mohammad Saeed Majedi, and Amir Reza Attari
J. Opt. Soc. Am. B 34(6) 1191-1198 (2017)

Design of an ultra-short coupler in an asymmetric twin-waveguide structure using transformation optics

Kaisheng Chen, Zhuyang Huang, Gaoneng Dong, and Xinliang Zhang
Appl. Opt. 53(33) 7831-7837 (2014)

Design of polarization splitting devices with ideal transmission and anisotropy considerations

Hossein Eskandari, Amir Reza Attari, and Mohammad Saeed Majedi
J. Opt. Soc. Am. B 35(7) 1585-1595 (2018)