In this study, we explore the innovative potential of metalenses as a compact and flexible alternative to digital micromirror devices, marking a significant advancement in optical engineering. Specifically, we highlight the use of the phase change material Sb2Se3 for its ability to enable swift, reversible, and non-volatile focusing and defocusing actions within the 1550 nm telecom spectrum. The integration of a robust ITO microheater into the lens design enhances its functionality, paving the way for dynamic meta lenses suited for beamforming applications. Through a detailed microfabrication process, we demonstrate a metalens capable of rapid tuning at the 0.1MHz level for focusing and defocusing within the C band communication range, by toggling the phase change material between its amorphous and crystalline states. Experimental results reveal a high contrast ratio for switching of 28.7 dB, underscoring the device’s efficiency and potential in revolutionizing optical component design for telecommunications and beyond.
Here we present an innovative free-space optical (FSO) communication system which is capable of training database in real-time and demultiplex multiplexed spatial structured laser beams such as orbital angular momentum (OAM) beams under varying atmospheric turbulent conditions. The core part of our detection system is heterogeneous convolutional neural network includes an optical 4f system using first Fourier convolution neural network layer driven by kilohertz-fast reprogrammable high-resolution digital micromirror devices (DMDs). This optical-filtering-based convolutional neural network is utilized to realize the training and demultiplexing 4-bit OAM-coded beams under simulated turbulent condition using modified von K´arm´an atmospheric model. The current implementation shows classification accuracy of 89.35% (under weak turbulence) and 38.26% (under strong turbulence).
In this paper, we present an improved version of an Application-Specific Photonic Integrated Chip for solving Partial Differential Equations (PDEs). This novel chip is designed to solve PDEs with specific reflecting boundary conditions, by means of a series of integrated mirrors at the edges.
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