Nonlinear Computational Edge Detection Metalens

Zhou, Junxiao; Wu, Qianyi; Chen, Ching‐Fu; Lei, Ming; Chen, Guanghao; Tian, Fanglin; Liu, Zhaowei

doi:10.1002/adfm.202204734

Cited by 26 publications

(15 citation statements)

References 42 publications

(47 reference statements)

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“…In addition, large-scale fabrication techniques, such as nanoimprint lithography, 180 – 187 holographic lithography, 188 and self-assembly, 189 – 191 could allow for the mass production of metasurfaces for ONNs. Together with advancements in nonlinear responses, 192 deep ONNs with nonlinear activation functions could be a reality. Furthermore, with coding metasurfaces that allow for the manipulation of the properties of single meta-atoms or unit cells in real time, ONNs could be trained completely optically, proving that the future has the possibility to be driven by optics.…”

Section: Discussionmentioning

confidence: 99%

Computation at the speed of light: metamaterials for all-optical calculations and neural networks

2022

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The explosion in the amount of information that is being processed is prompting the need for new computing systems beyond existing electronic computers. Photonic computing is emerging as an attractive alternative due to performing calculations at the speed of light, the change for massive parallelism, and also extremely low energy consumption. We review the physical implementation of basic optical calculations, such as differentiation and integration, using metamaterials, and introduce the realization of all-optical artificial neural networks. We start with concise introductions of the mathematical principles behind such optical computation methods and present the advantages, current problems that need to be overcome, and the potential future directions in the field. We expect that our review will be useful for both novice and experienced researchers in the field of all-optical computing platforms using metamaterials.

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Section: Discussionmentioning

confidence: 99%

Computation at the speed of light: metamaterials for all-optical calculations and neural networks

2022

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“…a continuously tunable coherent transfer function. With highintensity illumination, the metalens presents an edge-detection image, while diffracting full images with low-intensity lighting [234] . Phase contrast imaging can capture only qualitative phase information, while acquiring quantitative phase data is a rapidly growing demand for more sophisticated analysis.…”

Section: Microscopy Applications With Enhanced Functionalitiesmentioning

confidence: 99%

“…The metalens consists of nanoantenna structures with a static geometric phase and nonlinear metallic quantum well layer; it can offer an intensity-dependent dynamic phase, resulting in a continuously tunable coherent transfer function. With high-intensity illumination, the metalens presents an edge-detection image, while diffracting full images with low-intensity lighting [234] . Phase contrast imaging can capture only qualitative phase information, while acquiring quantitative phase data is a rapidly growing demand for more sophisticated analysis.…”

Section: Application Scenariosmentioning

confidence: 99%

Revolutionary meta-imaging: from superlens to metalens

Chen

Xiao

et al. 2023

Photonics Insights

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The refractive-lens technique has been well developed over a long period of evolution, offering powerful imaging functionalities, such as microscopes, telescopes, and spectroscopes. Nevertheless, the ever-growing requirements continue to urge further enhanced imaging capabilities and upgraded devices that are more compact for convenience. Metamaterial as a fascinating concept has inspired unprecedented new explorations in physics, material science, and optics, not only in fundamental researches but also novel applications. Along with the imaging topic, this paper reviews the progress of the flat lens as an important branch of metamaterials, covering the early superlens with super-diffraction capability and current hot topics of metalenses including a paralleled strategy of multilevel diffractive lenses. Numerous efforts and approaches have been dedicated to areas ranging from the new fascinating physics to feasible applications. This review provides a clear picture of the flat-lens evolution from the perspective of metamaterial design, elucidating the relation and comparison between a superlens and metalens, and addressing derivative designs. Finally, application scenarios that favor the ultrathin lens technique are emphasized with respect to possible revolutionary imaging devices, followed by conclusive remarks and prospects.

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“…Thus, they are generally bulky and nonplanar, as the thickness of the lens is determined by the required phase distribution, which is usually curved. On the contrary, the phase profile of a metalens is controlled by the optical response of each meta-atom and, therefore, metalenses can obtain a curved phase profile with a planar and ultrathin configuration [ 4 , 5 , 6 , 32 , 33 ]. As fundamental optical elements, metalenses have shown promising applications in miniaturized and integrated optical systems for optical imaging, spectroscopic analysis and measurement, lithography, and so on.…”

Section: Metasurface For Spatially Varying Foci and Polarization Statesmentioning

confidence: 99%

A Single-Celled Metasurface for Multipolarization Generation and Wavefront Manipulation

Guo²,

Liu

et al. 2022

Nanomaterials

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Due to their unprecedented ability to flexibly manipulate the parameters of light, metasurfaces offer a new approach to integrating multiple functions in a single optical element. In this paper, based on a single-celled metasurface composed of chiral umbrella-shaped metal–insulator–metal (MIM) unit cells, a strategy for simultaneous multiple polarization generation and wavefront shaping is proposed. The unit cells can function as broadband and high-performance polarization-preserving mirrors. In addition, by introducing a chiral-assisted Aharonov–Anandan (AA) geometric phase, the phase profile and phase retardation of two spin-flipped orthogonal circular polarized components can be realized simultaneously and independently with a single-celled metasurface via two irrelevant parameters. Benefiting from this flexible phase manipulation ability, a vectorial hologram generator and metalens array with spatially varying polarizations were demonstrated. This work provides an effective approach to avoid the pixel and efficiency losses caused by the intrinsic symmetry of the PB geometric phase, and it may play an important role in the miniaturization and integration of multipolarization-involved displays, real-time imaging, and spectroscopy systems.

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Nonlinear Computational Edge Detection Metalens

Cited by 26 publications

References 42 publications

Computation at the speed of light: metamaterials for all-optical calculations and neural networks

Computation at the speed of light: metamaterials for all-optical calculations and neural networks

Revolutionary meta-imaging: from superlens to metalens

A Single-Celled Metasurface for Multipolarization Generation and Wavefront Manipulation

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