Ultracompact high-efficiency polarising beam splitter based on silicon nanobrick arrays

Zheng, Guoxing; Liu, Guogen; Kenney, Mitchell; He, Ping 'an; Li, Song; Ren, Zhi; Deng, Qiling

doi:10.1364/oe.24.006749

Cited by 42 publications

(18 citation statements)

References 33 publications

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“…The advanced anisotropy manipulation of metasurfaces indicates the capability of achieving dual polarization multiplexing for two beams of orthogonal LP light. For example, by changing the arm length of a cross-shaped nanostructure 18,19 or the dimensions of a nanoscale pillar [20][21][22][23][24] , the phase or amplitude of orthogonal LP light can be independently controlled, and then, polarizing beam splitters 18,20 , dualchannel nanoprinting devices 19,21,22 , step-zoom lenses 23 , 3D holograms 24 , and devices with other functionalities can be realized. Furthermore, the phase of orthogonal CP light 25 , any orthogonal polarized light 26 , or even nonorthogonal polarized light 27 can be independently modulated in two polarization modes by simultaneously elaborately designing the dimensions and orientations of nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Malus-metasurface-assisted polarization multiplexing

et al. 2020

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Polarization optics plays a pivotal role in diffractive, refractive, and emerging flat optics, and has been widely employed in contemporary optical industries and daily life. Advanced polarization manipulation leads to robust control of the polarization direction of light. Nevertheless, polarization control has been studied largely independent of the phase or intensity of light. Here, we propose and experimentally validate a Malus-metasurface-assisted paradigm to enable simultaneous and independent control of the intensity and phase properties of light simply by polarization modulation. The orientation degeneracy of the classical Malus's law implies a new degree of freedom and enables us to establish a one-to-many mapping strategy for designing anisotropic plasmonic nanostructures to engineer the Pancharatnam-Berry phase profile, while keeping the continuous intensity modulation unchanged. The proposed Malus metadevice can thus generate a near-field greyscale pattern, and project an independent far-field holographic image using an ultrathin and single-sized metasurface. This concept opens up distinct dimensions for conventional polarization optics, which allows one to merge the functionality of phase manipulation into an amplitudemanipulation-assisted optical component to form a multifunctional nano-optical device without increasing the complexity of the nanostructures. It can empower advanced applications in information multiplexing and encryption, anti-counterfeiting, dual-channel display for virtual/augmented reality, and many other related fields.

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Section: Introductionmentioning

confidence: 99%

Malus-metasurface-assisted polarization multiplexing

et al. 2020

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“…The polarization efficiency, defined as 71 , is evaluated as η = 97%, η = 99% and η = 96% in the visible region for the 533, 600 and 750 nm polarizing beam splitters, respectively, and η = 88% in the near-IR region for the λ 0 = 900 nm polarizer. Transmission/reflection flat-optics polarizers reaching polarization efficiencies of this high have only been reported in the near-IR around λ = 1500 nm 72,73 , where silicon has no losses. The approach presented in this work obtained similar results in the visible range at wavelengths at which Si is highly absorbing, proving to be a successful path to address the loss problem of high refractive index semiconductors in the design of highly efficient flat optics in the visible region.…”

Section: Resultsmentioning

confidence: 99%

Broadband vectorial ultrathin optics with experimental efficiency up to 99% in the visible region via universal approximators

et al. 2021

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Integrating conventional optics into compact nanostructured surfaces is the goal of flat optics. Despite the enormous progress in this technology, there are still critical challenges for real-world applications due to the limited operational efficiency in the visible region, on average lower than 60%, which originates from absorption losses in wavelength-thick (≈ 500 nm) structures. Another issue is the realization of on-demand optical components for controlling vectorial light at visible frequencies simultaneously in both reflection and transmission and with a predetermined wavefront shape. In this work, we developed an inverse design approach that allows the realization of highly efficient (up to 99%) ultrathin (down to 50 nm thick) optics for vectorial light control with broadband input–output responses in the visible and near-IR regions with a desired wavefront shape. The approach leverages suitably engineered semiconductor nanostructures, which behave as a neural network that can approximate a user-defined input–output function. Near-unity performance results from the ultrathin nature of these surfaces, which reduces absorption losses to near-negligible values. Experimentally, we discuss polarizing beam splitters, comparing their performance with the best results obtained from both direct and inverse design techniques, and new flat-optics components represented by dichroic mirrors and the basic unit of a flat-optics display that creates full colours by using only two subpixels, overcoming the limitations of conventional LCD/OLED technologies that require three subpixels for each composite colour. Our devices can be manufactured with a complementary metal-oxide-semiconductor (CMOS)-compatible process, making them scalable for mass production at low cost.

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“…Although the phase manipulation of GEMS is independent of the dimensions of nanostructures, the combination of geometric phase and Mie resonance can provide a new approach for lightwave manipulation. In 2016, Zheng et al designed a dielectric nanostructure acting as nanopolarizer [78]. As Mie resonance occurs along the long axis of the nanostructure, it can reflect and transmit most of incident light polarized along the long and short axes, respectively.…”

Section: P-b Phase With Dielectricsmentioning

confidence: 99%

Advances in exploiting the degrees of freedom in nanostructured metasurface design: from 1 to 3 to more

Yu²,

Zheng

2020

Nanophotonics

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The unusual electromagnetic responses of nanostructured metasurfaces endow them with an ability to manipulate the four fundamental properties (amplitude, phase, polarization, and frequency) of lightwave at the subwavelength scale. Based on this, in the past several years, a lot of innovative optical elements and devices, such as metagratings, metalens, metaholograms, printings, vortex beam generators, or even their combinations, have been proposed, which have greatly empowered the advanced research and applications of metasurfaces in many fields. Behind these achievements are scientists’ continuous exploration of new physics and degrees of freedom in nanostructured metasurface design. This review will focus on the progress on the design of different nanostructured metasurfaces for lightwave manipulation, including by varying/fixing the dimensions and/or orientations of isotropic/anisotropic nanostructures, which can therefore provide various functionalities for different applications. Exploiting the design degrees of freedom of optical metasurfaces provides great flexibility in the design of multifunctional and multiplexing devices, which can be applied in anticounterfeiting, information encoding and hiding, high-density optical storage, multichannel imaging and displays, sensing, optical communications, and many other related fields.

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Ultracompact high-efficiency polarising beam splitter based on silicon nanobrick arrays

Cited by 42 publications

References 33 publications

Malus-metasurface-assisted polarization multiplexing

Malus-metasurface-assisted polarization multiplexing

Broadband vectorial ultrathin optics with experimental efficiency up to 99% in the visible region via universal approximators

Advances in exploiting the degrees of freedom in nanostructured metasurface design: from 1 to 3 to more

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