Numerical Simulation of a Beam Splitter on a Silicon Chip for the Terahertz Wavelength Range

The terahertz range is a modern, actively developing scientific field with numerous applications. Similar to the optical and infrared ranges, photonic integrated circuits (PICs) have also begun to develop in the terahertz range, which have the functionality of devices in free space, but have small dimensions and high efficiency. Presently, there are many different implementations of PIC, however, the idea of terahertz photonic circuits is still young, since there are no realizations of many passive and active elements. In this work, dielectric waveguides and 50/50 beam splitters will be considered, in the implementation of the Y-splitter, a multimode interferometer (MMI) for terahertz radiation, for frequencies of the order of 0.15 THz. The designs considered in this work are not optimal, however, in the future, it is planned to carry out work to improve their key characteristics — reducing losses, increasing bandwidth, decreasing polarization sensitivity.