Compact 2×2 parabolic multimode interference thermo–optic switches based on fluorinated photopolymer

Wang Ji-Hou¹, Chen Chang-Ming¹, Hu Ke-Wei¹, Cheng Ru¹, Wang Chun-Xue¹, Yi Yun-Ji¹, Sun Xiao-Qiang¹, Wang Fei¹, Li Zhi-Yong², Zhang Da-Ming^{1, †}

(a) Molecular structure of fluorinated photopolymer (FBPA-PC EP and FSU-8); (b) Near-infrared absorption spectrum of FSU-8(25%)/FBPA-PC EP and Commercial SU-8.