Artificial neural networks (ANNs) are known to be a versatile tool for device optimization. This work proposes a method to optimize a polarization converter composed of T-shaped periodic resonators, inclined at 45 deg using an ANN. The result is compared with previous work conducted using CST simulation, demonstrating broadband and wide-angle reflective linear polarization conversion. Employing an ANN resulted to improved performance metrics, leading to increased fractional bandwidth of 7.6% for normal incident and 9.8% for 45° incident angle. The neural network achieved a mean square error (MSE) as low as 5.78 × 10−5, indicating high accuracy. This approach demonstrates the efficiency of ANNs in designing metasurfaces for a wide range of applications.
Metasurfaces with angular sensitivity have been shown to provide a platform for developing an ultra-compact phase imaging system. Their performance, however, is often limited to a narrow range of spatial frequencies. Here, we apply inverse design to design and fabricate a metasurface an asymmetric optical transfer function across a numerical aperture (NA) of 0.6. The engineered response of this device enables phase imaging of microscopic transparent objects.
Recent advances in the field of photonics and topological physics can be combined to offer a solution to planar 6G, above 100 GHz, communication devices. As specific examples, we demonstrate that a hybrid photonic crystal waveguide can support a single-mode transmission covering 0.367–0.411 THz (over twice as wide as that of all-silicon photonic crystal waveguides). By breaking the photonic crystal symmetry, topologically protected modes can be introduced with a single mode linear-dispersion transmission window (over 0.143–0.162 THz) and robust transmission around sharp corners without any deterioration in the bandwidth. Such topologically protected waveguides, here produced using simple 3D printing techniques, offer a unique simplification in design. The absence of coupling to back-propagating modes removes the requirement to carefully design away spurious resonances, offering a pathway to a truly versatile planar platform for integrated 6G devices with low loss and wide bandwidth.
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