Zehui Lu, Shaoxiang Duan, Hao Zhang, Wei Lin, Haifeng Liu, Bo Liu, Fan Jia
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Diffractive optical neural network for dual-wavelength vectorial vortex beams de-/multiplexing.
Vectorial vortex beams (VVBs) exhibit unique polarization and mode characteristics, positioning them as promising candidates for advanced photonic applications. However, the efficient de-/multiplexing of VVBs, particularly across multiple wavelengths, remains a significant challenge. To address this, we propose a complex amplitude-modulation metasurface-based diffractive optical neural network (DNN) for dual-wavelength vector mode de-/multiplexing. Our approach enables full-dimensional control of vectorial optical fields by implementing a global optimization framework, achieving high mode conversion efficiency and low cross talk across up to 40 channels. Additionally, we investigate the impact of initial values and layer counts on optimization performance, offering valuable insights for enhancing DNN efficiency. This work provides a simple, yet efficient, platform for further applications of VVBs.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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