Optical Computation of Divergence Operation for Vector Fields

Lou, Yijie; Fang, Yisheng; Ruan, Zhichao

doi:10.1103/physrevapplied.14.034013

Cited by 10 publications

(4 citation statements)

References 47 publications

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“…Metasurfaces, ultrathin metamaterials composed by subwavelength microstructures exhibiting tailored electromagnetic (EM) responses, offer a new platform to control light waves [7][8][9][10][11]. Many fascinating effects were realized based on metasurfaces, including perfect absorption [12][13][14][15][16], perfect transparency [17][18][19][20][21], and many others [22][23][24][25][26][27][28]. However, strong reflections always appear in such meta-devices at frequencies out of their narrow working bands in which perfect absorption/transparency is achieved.…”

Section: Introductionmentioning

confidence: 99%

Manipulating light transmission and absorption via an achromatic reflectionless metasurface

et al. 2023

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Freely switching light transmission and absorption via an achromatic reflectionless screen is highly desired for many photonic applications (e.g., energy-harvesting, cloaking, etc.), but available meta-devices often exhibit reflections out of their narrow working bands. Here, we rigorously demonstrate that an optical metasurface formed by two resonator arrays coupled vertically can be perfectly reflectionless at all frequencies below the first diffraction mode, when the near-field (NF) and far-field (FF) couplings between two constitutional resonators satisfy certain conditions. Tuning intrinsic loss of the system can further modulate the ratio between light transmission and absorption, yet keeping reflection diminished strictly. Designing/fabricating a series of metasurfaces with different inter-resonator configurations, we experimentally illustrate how varying inter-resonator NF and FF couplings can drive the system to transit between different phase regions in a generic phase diagram. In particular, we experimentally demonstrate that a realistic metasurface satisfying the discovered criteria exhibits the desired achromatic reflectionless property within 160–220 THz (0–225 THz in simulation), yet behaving as a perfect absorber at ~ 203 THz. Our findings pave the road to realize meta-devices exhibiting designable transmission/absorption spectra immune from reflections, which may find many applications in practice.

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Section: Introductionmentioning

confidence: 99%

Manipulating light transmission and absorption via an achromatic reflectionless metasurface

et al. 2023

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“…A Metasurface is a novel artificial thin two-dimensional artificial material consisting of subwavelength elements, which provides a powerful platform to manipulate the EM wave with high degrees of freedom (Holloway et al, 2012;Yu and Capasso, 2014). Thanks to the years of painstaking research of scientists, many great achievements have been obtained, such as orbital angular momentum (OAM) beam generators (Pu et al, 2015;Bi et al, 2018;Zhang et al, 2018;Wang Y. et al, 2020), vector vortex beam generators (Yue et al, 2016;Zuo et al, 2018;Zhuang et al, 2019;Bao et al, 2020), holograms (Zheng et al, 2015;Wang et al, 2018;Wang et al, 2019;Ding et al, 2020), optical computation (Lin et al, 2018;Li et al, 2019;Abdollahramezani et al, 2020;Lou et al, 2020;Qian et al, 2020), reconfigurable metasurfaces (Ratni et al, 2018;Feng et al, 2020a;Feng et al, 2020b;Ratni et al, 2020;De Lustrac et al, 2021;Popov et al, 2021), multifunctional metasurfaces (Yuan et al, 2019;Zhang et al, 2019;Yuan et al, 2020a;Yuan et al, 2020b;Yuan et al, 2020c;Guan et al, 2020), and superoscillatory lens (Huang et al, 2014;Tang et al, 2015;Qin et al, 2017;Li et al, 2018;Li et al, 2021), etc. Besides, there are still many potential theories and applications that need to be unveiled and exploited.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Thin Chiral Metasurface-Based Superoscillatory Lens

Yang

Yuan

et al. 2022

Front. Mater.

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The metasurface-based superoscillatory lens has been demonstrated to be effective in finely tailoring the wavefront of light to generate focal spots beyond the diffraction limit in the far-field that is capable of improving the resolution of the imaging system. In this paper, an ultra-thin (0.055 λ0) metasurface-based superoscillatory lens (SOL) that can generate a sub-diffraction optical needle with a long focal depth is proposed, which is constructed by ultra-thin chiral unit cells containing two metal split-ring resonators (SRR) with a 90° twisted angle difference cladded on both sides of a 1.5 mm-thick dielectric substrate, with a high linear cross-polarized transmission coefficient around 0.9 and full phase control capability at 11 GHz. Full-wave simulation shows that SOL generates a sub-diffraction optical needle within 10.5–11.5 GHz. At the center frequency, the focal depth is 281 mm (10.3 λ0) within 105–386 mm, the full width at half maximum (FWHM) is 18.5 mm (0.68 λ0), about 0.7 times the diffraction limit, generally consistent with the theoretical result. The proposed ultra-thin chiral metasurface-based SOL holds great potential in integrating into practical imaging applications for its simple fabrication, high efficiency, and low-profile advantages.

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“…Such condition is quite challenge to meet since the degree of freedom for tailoring the induced electromagnetic multipolar moments of a nanoparticle is quite limited. Such a condition can also be readily fulfilled through structured light illumination 16 which generally extends the scopes of light-matter interaction from both fundamental science and application prospectives, such as high numerical aperture (NA) focusing [27][28][29] , optical computation 45 , optical data storage 30 , customized excitation of electromagnetic multipole resonances [31][32][33][34][35][36][37] and radiationless anapole condition 9,16,17 , enhancement of optical nonlinearity 38,39 , optical tweezers 40,41 and advanced metrology 42,43 .…”

Section: Introductionmentioning

confidence: 99%

Cylindrical vector beams reveal radiationless anapole condition in a resonant state

Lu,

Xu,

Ouyang

et al. 2021

Preprint

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Nonscattering optical anapole condition is corresponding to the excitation of radiationless field distributions in open resonators, which offers new degrees of freedom for tailoring light-matter interaction. Conventional mechanisms for achieving such a condition relies on sophisticated manipulation of electromagnetic multipolar moments of all orders to guarantee superpositions of vanished moment strengths at the same wavelength. In contrast, here we report on the excitation of optical radiationless anapole hidden in a resonant state of a Si nanoparticle utilizing tightly focused radially polarized (RP) beam. The coexistence of magnetic resonant state and anapole condition at the same wavelength further enables the triggering of resonant state by tightly focused azimuthally polarized (AP) beam whose corresponding electric multipole coefficient could be zero. As a result, high contrast inter-1

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Optical Computation of Divergence Operation for Vector Fields

Cited by 10 publications

References 47 publications

Manipulating light transmission and absorption via an achromatic reflectionless metasurface

Manipulating light transmission and absorption via an achromatic reflectionless metasurface

Ultra-Thin Chiral Metasurface-Based Superoscillatory Lens

Cylindrical vector beams reveal radiationless anapole condition in a resonant state

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