Design and Analysis of Even-Positioned Cavity-Based Optical Amplification Device in Dielectric Metasurface

Recently, the development in the field of optical technology is exemplary, precisely relating to the design of the components, necessary for optical integrated circuits. This research work investigates optical amplification action in a 2D Photonic Crystals (PhCs) based metasurface with variable radius even-positioned PhC-cavity. Two optical signals are used, i.e., data signal coupled into the optical structure using the phenomenon of the Guided-mode-resonances (GMR) and a pump signal index-guided into the optical structure. The pump signal is used to amplify the data signal and the PhC-cavity is used for spectral tuning of the device operating in the near-infrared (NIR) range. The designed structure comprises of an optical waveguide packed in between the layers of a substrate and cladding. The design and analysis of the proposed device is performed using Finite-difference Time-domain (FDTD) approach in an open-source software package. The investigated results present optical amplification action for a PhC-cavity of radius i.e., greater than the standard radius of the PhC-elements used in the investigated structure. Moreover, as a concluded fact, PhC-cavity nearer to the symmetric point of the optical structure will greatly influence the amplification phenomena and tuning of the GMR modes. The designed device can be used in applications relating to optical transistors, filters, and integrated circuits.