Low-loss, efficient, wide-angle 1 × 4 power splitter at ∼155 μm wavelengths for four play applications built with a monolithic photonic crystal slab

Abstract

We exhibit a low-loss, efficient, and wide-angle 1×4 power splitter based on a silicon monolithic photonic crystal slab with triangular lattice air holes. A distinctive power-splitting ratio can be obtained depending on the hole shift in the bending region and the structure adjustment at the junction area with regard to the power splitter designed. Simulation results achieved with a rigorous finite-difference time-domain technique show that the TE-polarized light is designed to ensure single-mode operation and the transmitted power is distributed almost equally, with a total transmission of 93.4% at the 1550nm optical operation wavelength. Furthermore, we demonstrate ultralow-loss output of the optimized power splitter, with a transmittance above 22.5% (-6.48 dB) achieved in the ranges of 1524-1594 and 1610-1620nm, which cover the entire C-band and a large portion of the L-band of optical communication.