Polarization manipulation on step-index composite polymer beam splitters for photonics circuitry

Abstract

This paper presents composite beam splitters realized with polymer materials for developing

photonic integrated circuits. We used organic-inorganic hybrid polymer materials to form this

composite beam splitter realized with step-index (SI) core profiles. We used the alternating direction

implicit technique of the Rsoft CAD BeamPROP solver to design and analyze these beam

splitters. We successfully examined and manipulated the beam splitter’s polarization dependency

to obtain a 99% output efficiency with a 50:50 splitting ratio. The SI beam splitter exhibits an

excess loss of 0.014 dB. When we apply polarized light in this beam splitter, the excess loss increases

to 2 dB, and this loss gradually decreases as the angle of incident light increases. The

excess loss reduces to 0.05 dB at the 31-degree angles of the incident polarized light. We also

investigated the crosstalk of this beam splitter by varying the wavelength, and it is evident that

the lowest crosstalk is 􀀀 19.77 dB at the polarized angle of 31◦.