A Fully Phase-Modulated Metasurface as An Energy-Controllable Circular Polarization Router.
Yueyi Yuan,Shang Sun,Yang Chen,Kuang Zhang,Xumin Ding,Badreddine Ratni,Qun Wu,Shah Nawaz Burokur,Cheng-Wei Qiu +8 more
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TLDR
A general method is proposed to construct phase‐modulated metasurfaces for implementing functionalities separately in co‐ and cross‐polarized output fields under circularly polarized (CP) incidence, which is impossible to achieve with solely a geometric phase.Abstract:
Geometric metasurfaces primarily follow the physical mechanism of Pancharatnam-Berry (PB) phases, empowering wavefront control of cross-polarized reflective/transmissive light components. However, inherently accompanying the cross-polarized components, the copolarized output components have not been attempted in parallel in existing works. Here, a general method is proposed to construct phase-modulated metasurfaces for implementing functionalities separately in co- and cross-polarized output fields under circularly polarized (CP) incidence, which is impossible to achieve with solely a geometric phase. By introducing a propagation phase as an additional degree of freedom, the electromagnetic (EM) energy carried by co- and cross-polarized transmitted fields can be fully phase-modulated with independent wavefronts. Under one CP incidence, a metasurface for separate functionalities with controllable energy repartition is verified by simulations and proof-of-principle microwave experiments. A variety of applications can be readily expected in spin-selective optics, spin-Hall metasurfaces, and multitasked metasurfaces operating in both reflective and transmissive modes.read more
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Defect Induced Polarization Loss in Multi-Shelled Spinel Hollow Spheres for Electromagnetic Wave Absorption Application.
TL;DR: In this article, the defect induced dielectric loss dominant mechanism in virtue of multi-shelled spinel hollow sphere for the first time is demonstrated, and the unique but identical morphology design as well as suitable composition modulation for serial spinels can exclude the disturbance of EM wave dissipation from dipolar/interfacial polarization and conduction loss.
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Polarization-Engineered Noninterleaved Metasurface for Integer and Fractional Orbital Angular Momentum Multiplexing
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Programmable Controls to Scattering Properties of a Radiation Array
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Generating Dual-Polarized Vortex Beam by Detour Phase: From Phase Gradient Metasurfaces to Metagratings
TL;DR: In this paper , a dual-polarized vortex beam generator based on metasurface and metagrating (MG) is proposed, where the phase is modulated through moving the position of meta-atoms instead of varying the geometrical parameters or rotating the unit cells.
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Dielectric metalens for miniaturized imaging systems: progress and challenges
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TL;DR: In this article , the challenges of using dielectric metalenses to replace conventional optics in miniature optical systems are discussed. And the potential approaches to address the existing challenges are also deliberated.
References
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Dielectric metasurfaces for complete control of phase and polarization with subwavelength spatial resolution and high transmission
TL;DR: A metasurface platform based on high-contrast dielectric elliptical nanoposts that provides complete control of polarization and phase with subwavelength spatial resolution and an experimentally measured efficiency ranging from 72% to 97%, depending on the exact design.
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A broadband achromatic metalens for focusing and imaging in the visible.
Wei Ting Chen,Alexander Y. Zhu,Vyshakh Sanjeev,Vyshakh Sanjeev,Mohammadreza Khorasaninejad,Zhujun Shi,Eric Lee,Eric Lee,Federico Capasso +8 more
TL;DR: It is shown that by judicious design of nanofins on a surface, it is possible to simultaneously control the phase, group delay and group delay dispersion of light, thereby achieving a transmissive achromatic metalens with large bandwidth.
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Metasurface Polarization Optics: Independent Phase Control of Arbitrary Orthogonal States of Polarization.
TL;DR: This work presents a method allowing for the imposition of two independent and arbitrary phase profiles on any pair of orthogonal states of polarization-linear, circular, or elliptical-relying only on simple, linearly birefringent wave plate elements arranged into metasurfaces.
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Arbitrary spin-to–orbital angular momentum conversion of light
TL;DR: A metasurface converter for optical states that transforms polarization states into optical angular momentum states and illustrates a general material-mediated connection between SAM and OAM of light and may find applications in producing complex structured light and in optical communication.
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Helicity multiplexed broadband metasurface holograms
Dandan Wen,Fuyong Yue,Guixin Li,Guoxing Zheng,Guoxing Zheng,Kinlong Chan,Shumei Chen,Ming Chen,Ming Chen,King Fai Li,Polis Wing Han Wong,Kok Wai Cheah,Edwin Yue Bun Pun,Shuang Zhang,Xianzhong Chen +14 more
TL;DR: The demonstrated helicity multiplexed metasurface hologram with its high performance opens avenues for future applications with functionality switchable optical devices.