Open AccessUltrabroadband, compact, polarization independent and efficient metasurface-based power splitter on lithium niobate waveguides
Author(s) -
Amged Alquliah,
Mohamed ElKabbash,
Jihua Zhang,
Jinluo Cheng,
Guo Chen
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.415676
Subject(s) - lithium niobate , optics , splitter , power dividers and directional couplers , beam splitter , bandwidth (computing) , materials science , polarization (electrochemistry) , waveguide , optoelectronics , insertion loss , physics , telecommunications , computer science , laser , chemistry
We propose a metasurface-based Lithium Niobate waveguide power splitter with an ultrabroadband and polarization independent performance. The design consists of an array of amorphous silicon nanoantennas that partially converts the input mode to multiple output modes creating multimode interference such that the input power is equally split and directed to two branching waveguides. FDTD simulation results show that the power splitter operates with low insertion loss (< 1dB) over a bandwidth of approximately 800 nm in the near-infrared range, far exceeding the O, E, S, C, L and U optical communication bands. The metasurface is ultracompact with a total length of 2.7 µm. The power splitter demonstrates a power imbalance of less than 0.16 dB for both fundamental TE and TM modes. Our simulations show that the device efficiency exhibits high tolerance to possible fabrication imperfections.