This work was supported in part by the International Science & Technology Cooperation Program of China (No. 2014DFG32590), National Natural Science Foundation of China (No.61077015, 61307040), National R&D Program (No.2012AA040406), Natural Science Foundation of Liaoning Province (No. 2014020002), Opening Project of Shanghai Key Laboratory of All Solid-state Laser and Applied Techniques (No. 2013ADL04), and Fundamental Research Funds for the Central Universities (DUT 13JB01, DUT 15ZD231, and DUT2015TD47).
A 2 × 2 optical waveguide coupler at 850 nm based on the multimode interference (MMI) structure with the polysilsesquioxanes liquid series (PSQ-Ls) polymer material and the imprint technique is presented. The inf...