Abstract

On-chip polarization management components play a critical role in tackling polarization dependence in the lithium-niobate-on-insulator (LNOI) platform. In this work, we proposed a reconfigurable TE-pass polarizer based on optical phase change material (GST) and the LNOI wafer. The key region is formed by a hybrid GST–${\rm{S}}{{\rm{i}}_3}{{\rm{N}}_4}$ layer symmetrically deposited atop the centerline of the LNOI waveguide along the propagation direction where the GST is sandwiched in the middle of the ${\rm{S}}{{\rm{i}}_3}{{\rm{N}}_4}$ layer. Whether the polarizer will take effect depends on the phase states of the GST layer and the graphene and aluminum oxide layers are coated atop the ${\rm{GST}} {-} {\rm{S}}{{\rm{i}}_3}{{\rm{N}}_4}$ layer as the microheater to control the conversion of phase states. The proposed device length is 7.5 µm with an insertion loss (IL)=0.22 dB and extinction ratio (ER)=32.8 dB at the wavelength of 1550 nm. Moreover, it also has a high ER (${\gt}{{25}}\;{\rm{dB}}$) and a low IL (${\lt}{0.5}\;{\rm{dB}}$) in the operating bandwidth of 200 nm. Such a high-performance TE-pass polarizer paves a new way for applications of photonics integrated circuits.

© 2023 Optica Publishing Group

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