Enhancing Photon Throughput of Miniaturized Passive Depth-Detection Cameras via Broadband Dispersion-Engineered Metalenses

Zhang, Zhanyi; Xie, Lingyun; Zhang, Jian; He, Tao; Zhu, Jingyuan; Wang, Zhanshan; Dun, Xiong; Cheng, Xinbin

doi:10.1021/acsphotonics.3c01078

Cited by 3 publications

(1 citation statement)

References 50 publications

(58 reference statements)

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“…Optical metasurfaces represent two-dimensional artificial structured patterns comprising subwavelength meta-units with planar and easy integration nature [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. These meta-structures proficiently and precisely manipulate multidimensional parameters of electromagnetic waves, including phase, amplitude, and polarization, enabling the tailored shaping of light waves at the subwavelength scale [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. The multifunctional and integrated characteristics of meta-devices [ 29 , 30 ] bring unprecedented convenience to the development of ultra-compact optical systems, such as microfluidic chips [ 31 ], metasurface particle sorting [ 32 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Meta-Devices for Full-Polarization Rotation and Focusing in the Near-Infrared

Wan,

Ou,

Yang

et al. 2024

Micromachines

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The creation of multi-channel focused beams with arbitrary polarization states and their corresponding optical torques finds effective applications in the field of optical manipulation at the micro-nanoscale. The existing metasurface-based technologies for polarization rotation have made some progress, but they have been limited to single functions and have not yet achieved the generation of full polarization. In this work, we propose a multi-channel and spatial-multiplexing interference strategy for the generation of multi-channel focusing beams with arbitrary polarization rotation based on all-dielectric birefringent metasurfaces via simultaneously regulating the propagation phase and the geometric phase and independently controlling the wavefronts at different circular polarizations. For the proof of concept, we demonstrate highly efficient multi-channel polarization rotation meta-devices. The meta-devices demonstrate ultra-high polarization extinction ratios and high focusing efficiencies at each polarization channel. Our work provides a compact and versatile wavefront-shaping methodology for full-polarization control, paving a new path for planar multifunctional meta-optical devices in optical manipulation at micro–nano dimensions.

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Section: Introductionmentioning

confidence: 99%

Multifunctional Meta-Devices for Full-Polarization Rotation and Focusing in the Near-Infrared

Wan,

Ou,

Yang

et al. 2024

Micromachines

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A Review on Reconfigurable Metalenses Revolutionizing Flat Optics

Khonina,

Butt,

Kazanskiy

2023

Advanced Optical Materials

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Metalenses (MLs), representing a groundbreaking paradigm shift within the realm of optics, have ushered in a transformative era in the ability to manipulate and harness the power of light. Diverging from the conventional approach reliant on curved surfaces to bend light, MLs harness intricate arrays of minuscule nanostructures to exert precise control over the phase and amplitude of incident light waves. This revolutionary technology bestows a plethora of advantages, including the creation of ultra‐compact optical systems, the enhancement of focusing capabilities to unprecedented levels, and the capability to rectify optical aberrations in a significantly thinner and more lightweight form factor. MLs have discovered a multitude of applications spanning diverse fields, from imaging and photography to augmenting reality and refining medical devices. They stand as a beacon of hope for reshaping the landscape of optical systems, courtesy of their remarkable adaptability and exceptional performance. As the evolution of MLs forges ahead, they hold immense potential to transcend the boundaries of what can be accomplished in the domain of light‐based technologies. This review presents the recent advances in reconfigurable MLs and their applicability to imaging systems.

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Hybrid design scheme for enabling large-aperture diffractive achromat imaging

Zhang,

Zhao,

Fan

et al. 2024

Opt. Express

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Diffractive achromats (DAs) combined with image processing algorithms offer a promising lens solution for high-performance ultra-thin imagers. However, the design of large-aperture DAs that align seamlessly with image processing algorithms remains challenging. Existing sequential methods, which prioritize focusing efficiency in DAs before selecting an algorithm, may not achieve a satisfactory match due to an ambiguous relationship between efficiency and final imaging quality. Conversely, image-quality-oriented end-to-end design often entails high computational complexity for both front-end optics and back-end algorithms, impeding the development of large-aperture designs. To address these issues, we present a hybrid design scheme that begins with end-to-end optimization of the DA with the simplest image processing algorithm, i.e., Wiener filter, significantly reducing the back-end complexity. Subsequently, we apply complex algorithm fine-tuning to further enhance image quality. We validate this hybrid design scheme through extensive investigations on several DA imagers. Our results demonstrate a reduction in memory requirement by approximately 50% while maintaining a high imaging quality with a reasonably large aperture. As a case in point, we simulated a DA imager with a 25 mm diameter aperture. Furthermore, our hybrid design scheme provides two crucial insights. Firstly, we find no strong linear correlation between focusing efficiency and imaging quality, which challenges the conventional understanding. Secondly, we establish a prediction formula for imaging quality, benefiting from the hybrid design scheme.

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Enhancing Photon Throughput of Miniaturized Passive Depth-Detection Cameras via Broadband Dispersion-Engineered Metalenses

Cited by 3 publications

References 50 publications

Multifunctional Meta-Devices for Full-Polarization Rotation and Focusing in the Near-Infrared

Multifunctional Meta-Devices for Full-Polarization Rotation and Focusing in the Near-Infrared

A Review on Reconfigurable Metalenses Revolutionizing Flat Optics

Hybrid design scheme for enabling large-aperture diffractive achromat imaging

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