DEVELOPMENT OF METASURFACE-BASED PHOTONIC DEVICES FOR HIGH-SPEED OPTICAL COMMUNICATION AND NEXT-GENERATION QUANTUM INFORMATION PROCESSING

Abstract

The metasurfaces can serve as an efficient and compact approach for control over optical fields in terms of phase, amplitude, polarization and propagation direction at subwavelength scales. Due to the ultrathin thickness and versatile functionality, they become promising elements in high-speed optical communication systems and quantum information technology. In this work, the probabilistic Monte Carlo model was designed for estimation of the robustness of dielectric metasurface under realistic fluctuations of phase response and optical transmission coefficient. It included generation of 200,000 randomly selected devices considering the average value of optical transmission equal to 92%, Gaussian distribution of phase error and amplitude fluctuations due to fabrication imperfections. According to simulation, the average value of optical transmission was estimated as around 90.6%, and 84.5% of generated devices demonstrated the transmission greater than 85%. Increasing of standard deviation of phase error from 0.05 rad to 0.25 rad decreased the probability of getting transmission greater than 85% from around 89.5% to 64.2%. The corresponding analytical estimate of quantum-state fidelity kept the value larger than 98.4% in the whole range of phase errors considered, which means that certain imperfections of fabrication can be acceptable in quantum photonic devices.