Polarization-enabled tunable focusing by visible-light metalenses with geometric and propagation phase

Zhang, Jianlei; Zhang, Lei; Huang, Kun; Duan, Zhenglu; Zhao, Feng

doi:10.1088/2040-8986/ab48cf

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…The focal point can be adjusted by combining the PB phase and the propagation phase. 71,75 One spin-multiplexed metalens uses the PB phase and propagation phase of TiO 2 nanorods. 71 It makes a polarization-independent hyperbolic phase and a polarization-dependent linear phase, depending on the polarization state of the incident light, and therefore has different focal points for LCP and RCP light [Fig.…”

Section: Tunable Metalenses By Light Sourcementioning

confidence: 99%

“…Research goals Multi-, varifocal length Storing multiple images 54,[129][130][131][132][133][134][135][136][137][138][139][140][141][142] Visualized sensing (thermal, chemical, etc.) [155][156][157][158][159][160][161][162] Optical encryption [140][141][142] Common stimuli Electrically tunable LC [76][77][78][79][80][81][82][149][150][151][152][153][154][155] Polarization (circular and linear polarization) [69][70][71][72][73][74][75][129][130]…”

Section: Types Metalenses Metahologramsmentioning

confidence: 99%

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Tunable metasurfaces towards versatile metalenses and metaholograms: a review

et al. 2022

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Metasurfaces have attracted great attention due to their ability to manipulate the phase, amplitude, and polarization of light in a compact form. Tunable metasurfaces have been investigated recently through the integration with mechanically moving components and electrically tunable elements. Two interesting applications, in particular, are to vary the focal point of metalenses and to switch between holographic images. We present the recent progress on tunable metasurfaces focused on metalenses and metaholograms, including the basic working principles, advantages, and disadvantages of each working mechanism. We classify the tunable stimuli based on the light source and electrical bias, as well as others such as thermal and mechanical modulation. We conclude by summarizing the recent progress of metalenses and metaholograms, and providing our perspectives for the further development of tunable metasurfaces.

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Section: Tunable Metalenses By Light Sourcementioning

confidence: 99%

Section: Types Metalenses Metahologramsmentioning

confidence: 99%

Tunable metasurfaces towards versatile metalenses and metaholograms: a review

et al. 2022

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“…2g and therefore verifies the creation of the required helical phase. Note that, a small phase jump at the boundaries between two size-different nanobricks occurs due to the propagation phase 55,56 , which has little influence on the entire performance of the meta-modulator and can be eliminated by adding the geometric phase with an equal and signopposite initial value.…”

Section: Edge-detection Meta-modulatormentioning

confidence: 99%

Ultracompact meta-imagers for arbitrary all-optical convolution

Zhao

et al. 2022

Light Sci Appl

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Electronic digital convolutions could extract key features of objects for data processing and information identification in artificial intelligence, but they are time-cost and energy consumption due to the low response of electrons. Although massless photons enable high-speed and low-loss analog convolutions, two existing all-optical approaches including Fourier filtering and Green’s function have either limited functionality or bulky volume, thus restricting their applications in smart systems. Here, we report all-optical convolutional computing with a metasurface-singlet or -doublet imager, considered as the third approach, where its point spread function is modified arbitrarily via a complex-amplitude meta-modulator that enables functionality-unlimited kernels. Beyond one- and two-dimensional spatial differentiation, we demonstrate real-time, parallel, and analog convolutional processing of optical and biological specimens with challenging pepper-salt denoising and edge enhancement, which significantly enrich the toolkit of all-optical computing. Such meta-imager approach bridges multi-functionality and high-integration in all-optical convolutions, meanwhile possessing good architecture compatibility with digital convolutional neural networks.

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“…Therefore, the metalens can generate two focuses for non-converted components of two orthogonally polarized light sources and one focus for converted components of the incident light. Another proposed metalens can continuously vary a focus by changing the state of polarization of the incident light from RCP to LCP (Zhang et al, 2019). The focal length can vary by 9.7 mm; at l = 633 nm, the focusing efficiency is 63.1% for LCP and 59.9% for RCP.…”

Section: Ll Open Accessmentioning

confidence: 99%

Recent Progress on Ultrathin Metalenses for Flat Optics

et al. 2020

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As technology advances, electrical devices such as smartphones have become more and more compact, leading to a demand for the continuous miniaturization of optical components. Metalenses, ultrathin flat optical elements composed of metasurfaces consisting of arrays of subwavelength optical antennas, provide a method of meeting those requirements. Moreover, metalenses have many other distinctive advantages including aberration correction, active tunability, and semi-transparency, compared to their conventional refractive and diffractive counterparts. Therefore, over the last decade, great effort has been focused on developing metalenses to investigate and broaden the capabilities of metalenses for integration into future applications. Here, we discuss recent progress on metalenses including their basic design principles and notable characteristics such as aberration correction, tunability, and multifunctionality.

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Polarization-enabled tunable focusing by visible-light metalenses with geometric and propagation phase

Cited by 9 publications

References 36 publications

Tunable metasurfaces towards versatile metalenses and metaholograms: a review

Tunable metasurfaces towards versatile metalenses and metaholograms: a review

Ultracompact meta-imagers for arbitrary all-optical convolution

Recent Progress on Ultrathin Metalenses for Flat Optics

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