All-silicon low-loss THz temporal differentiator based on microring waveguide resonator platform

Microring resonators have been widely used to fabricate passive optical devices such as wavelength division multiplexers, differentiators, and integrators.Research on terahertz (THz) components has been accelerated by these photonics technologies, and compact and integrated time-domain differentiator that enable low-loss, high-speed THz signal processing, and can be packaged for THz applications are necessary.In this study, an on-chip THz temporal differentiator based on all-silicon photonic technology was developed.This device primarily consisted of a microring waveguide resonator and was packaged with standard waveguide compatibility.The device performed timedomain differentiation on input signals at a frequency of 405.45 GHz and an insertion loss and a working bandwidth of 2.5 dB and 0.36 GHz, respectively.The differentiator handled various periodic waveforms.The device performed as an edge detector, which detected step-like edges in high-speed input signals through differential effects.