Metasurfaces with wavelength-controlled functions

Shi, Zhujun; Khorasaninejad, Mohammadreza; Huang, Yijia; Roques‐Carmes, Charles; Zhu, Aijiao; Chen, W. T.; Sanjeev, Vyshakh; Ding, Zhao-Wei; Tamagnone, Michele; Chaudhary, Kundan; Devlin, Robert C.; Qiu, Cheng‐Wei; Capasso, Federico

doi:10.1364/cleo_at.2018.jw2a.101

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…1a left panel). Areas of ongoing research efforts to extend the functionality of local metasurfaces include multifunctional (5,6), stacked (7)(8)(9) and dynamically tunable metasurfaces (10,11). There also is growing interest in local metasurfaces for display applications (12,13), including augmented reality (AR) headsets (14,15).…”

Section: Main Textmentioning

confidence: 99%

Multifunctional Resonant Wavefront-Shaping Meta-Optics

Malek

Overvig

Alù

et al. 2021

Conference on Lasers and Electro-Optics

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Photonic devices rarely provide both elaborate spatial control and sharp spectral control over an incoming wavefront. In optical metasurfaces, for example, the localized modes of individual meta-units govern the wavefront shape over a broad bandwidth, while nonlocal lattice modes extended over many meta-units support high quality-factor resonances. We experimentally demonstrate dielectric metasurfaces that offer both spatial and spectral control of light, realizing a metalens focusing light only over a narrowband resonance while leaving off-resonant frequencies unaffected. Our devices realize such functionality by supporting a quasi-bound state in the continuum encoded with a spatially varying geometric phase. We also show that our resonant metasurfaces can be cascaded to realize hyperspectral wavefront shaping, which may prove useful for augmented reality glasses, transparent displays and high-capacity optical communications.

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Section: Main Textmentioning

confidence: 99%

Multifunctional Resonant Wavefront-Shaping Meta-Optics

Malek

Overvig

Alù

et al. 2021

Conference on Lasers and Electro-Optics

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“…[24][25][26] Based on the dielectric/metal-dielectric-metal configurations, however, they are mostly limited to operating in reflection mode. [24][25][26] Transmissive bifunctional metasurfaces were reported in the microwave, [22,23] terahertz, [27] mid-infrared, [28] near-infrared, [15] and visible regimes. [29,30] In particular, the visible bifunctional plasmonic metasurfaces count on the Pancharatnam-Berry (P-B) phase so as to manipulate the wavefront of CP light.…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient Bifunctional Dielectric Metasurface Enabling Polarization‐Tuned Focusing and Deflection for Visible Light

Gao

Park

Choi

2019

Advanced Optical Materials

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A multifunctional metasurface has attracted drastically growing interest, serving as a prominent candidate to cope with both device miniaturization and integration. Conventional transmissive bifunctional metasurfaces working for visible light inherently suffer from several demerits owing to the use of geometric phase and spatial multiplexing scheme. Research endeavors have been mainly devoted to the implementation of a static device. In this work, a highly efficient bifunctional dielectric metasurface, taking advantage of a unit cell (UC) the building block of which capitalizes on a nanopost in hydrogenated amorphous silicon, is proposed and experimentally demonstrated to successfully enable polarization-mediated anomalous beam deflection and focusing in the visible band. Through the tailoring of the UC periodicity, we are capable of efficiently tuning the beam deflection angle and focusing distance. For the fabricated sample, the normal transverse-electric incidence within a spectral band from 600 nm to 715 nm is angle-resolved to a single diffraction order via the beam deflection, while a bright line focus is attained at the target focal plane for the normal transverse-magnetic incidence at  = 650 nm. This work will initiate a positive prospect for the development of highperformance tunable multifunctional metasurfaces.Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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“…Controlling the optical response of a scatterer via its geometry is the fundamental goal of nanophotonics. In recent years, devices consisting of periodically arranged subwavelength structures, each of which can be engineered to scatter light, have shown promising results in both miniaturizing existing optics , as well as in creating elements with new electromagnetic (EM) properties. − While such devices, also known as metasurfaces, do provide an extremely large number of parameters for designing optics, it is often challenging to harness all of these degrees of freedom relying solely on intuition. Adapted from the fluid dynamics community, inverse design provides an alternative paradigm to solve this problem.…”

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confidence: 99%

Deep Learning to Accelerate Scatterer-to-Field Mapping for Inverse Design of Dielectric Metasurfaces

2021

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The inverse design of optical metasurfaces is a rapidly emerging field that has already shown great promise in miniaturizing conventional optics as well as developing completely new optical functionalities. Such a design process relies on many forward simulations of a device’s optical response in order to optimize its performance. We present a data-driven forward simulation framework for the inverse design of metasurfaces that is more accurate than methods based on the local phase approximation, a factor of 104 times faster and requires 15 times less memory than mesh-based solvers and is not constrained to spheroidal scatterer geometries. We explore the scattered electromagnetic field distribution from wavelength scale cylindrical pillars, obtaining low-dimensional representations of our data via the singular value decomposition. We create a differentiable model fiting the input geometries and configurations of our metasurface scatterers to the low-dimensional representation of the output field. To validate our model, we inverse design two optical elements: a wavelength multiplexed element that focuses light for λ = 633 nm and produces an annular beam at λ = 400 nm and an extended depth of focus lens.

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Metasurfaces with wavelength-controlled functions

Cited by 4 publications

References 1 publication

Multifunctional Resonant Wavefront-Shaping Meta-Optics

Multifunctional Resonant Wavefront-Shaping Meta-Optics

A Highly Efficient Bifunctional Dielectric Metasurface Enabling Polarization‐Tuned Focusing and Deflection for Visible Light

Deep Learning to Accelerate Scatterer-to-Field Mapping for Inverse Design of Dielectric Metasurfaces

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