This paper presents a groundbreaking development in the field of organic photodetectors, introducing a novel dual-mode photodetector with exceptional thickness capabilities. The technology is achieved through the innovative use of multilayer blade coating techniques, enabling the seamless transition between narrowband and broadband modes through the application of bias. This pioneering device, termed the "Bias Switchable Narrowband-Broadband Near-Infrared (NIR) Organic Photodetector," is manufactured in ambient conditions and offers several distinct advantages, including dual-mode operation, halogen-free solvent usage, ambient fabrication conditions, and scalability in the manufacturing process.
Artificial subwavelength dielectric meta-lens (ML), realization of ultrathin and light-weight, provides a potential candidate to replace traditional bulky curved lens with high image quality. A ML with 1.5 mm in diameter having numerical aperture NA ~ 0.60 at the near-infrared wavelength λ = 0.94 μm was designed by finite-difference timedomain (FDTD) method with speeding up optimization of MLs’ scheme by deep neural network (DNN) model. Additionally, an ultra-thin high NA ML was achieved by cost effective semiconductor manufacturing technology. The fabricated ML can focus an incident light down to a spot as small as ~ 5.2 μm with high optical efficiency of ~88.4% (focusing efficiency achieved 23.7%). We also provided efficient MLs’ semiconductor manufacturing technology for the development of optical device in the near-infrared image technology.
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