High-Efficiency Visible Transmitting Polarizations Devices Based on the GaN Metasurface

Guo, Zhongyi; Xu, Haisheng; Guo, Kai; Shen, Fei; Zhou, Hongping; Zhou, Qingfeng; Gao, Jun; Yin, Zhiping

doi:10.3390/nano8050333

Cited by 39 publications

(22 citation statements)

References 35 publications

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“…If the size of the input laser beam is adjusted to match that of the metasurface blocks, the generation efficiency is the focusing efficiency of the metasurface blocks normalized to the ratio of the metasurface blocks area and the transverse crosssection area of the input beam. Recent developed dielectric metasurfaces have demonstrated the efficient beam steering with a high NA [39][40][41][42]. According to an experimental study of GaN metalens with NA = 0.78, an average focusing efficiency of 79% can be realized within the band of 450-660 nm [41].…”

Section: Resultsmentioning

confidence: 99%

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

2020

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AbstractLattice light-sheet microscopy (LLSM) was developed for long-term live-cell imaging with ultra-fine three-dimensional (3D) spatial resolution, high temporal resolution, and low photo-toxicity by illuminating the sample with a thin lattice-like light-sheet. Currently available schemes for generating thin lattice light-sheets often require complex optical designs. Meanwhile, limited by the bulky objective lens and optical components, the light throughput of existing LLSM systems is rather low. To circumvent the above problems, we utilize a dielectric metasurface of a single footprint to replace the conventional illumination modules used in the conventional LLSM and generate a lattice light-sheet with a ~3-fold broader illumination area and a significantly leveraged illumination efficiency, which consequently leads to a larger field of view with a higher temporal resolution at no extra cost of the spatial resolution. We demonstrate that the metasurface can manipulate spatial frequencies of an input laser beam in orthogonal directions independently to break the trade-off between the field of view and illumination efficiency of the lattice light-sheet. Compared to the conventional LLSM, our metasurface module serving as an ultra-compact illumination component for LLSM at an ease will potentially enable a finer spatial resolution with a larger numerical-aperture detection objective lens.

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Section: Resultsmentioning

confidence: 99%

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

2020

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“…Gallium nitride, an already widespread semiconductor, is selected for the realization of our components, as it offers several advantages: a) it remains highly transparent in the entire visible range; b) its sufficiently high refractive index (e.g.,>2) ensures that GaN nanostructures exhibit strong Mie scattering resonances; c) its very high thermal and chemical stability make this material suitable even for extreme application; d) it is a very mature material, highly compatible with the semiconductor fabrication techniques, with widespread applications in electronics and optoelectronics. Pioneering works on the design and the experimental realization of GaN beam deflectors and broadband metalenses in the visible wavelength range have recently been reported. For instance, metasurface components placed on the top of commercial LEDs have improved their extraction efficiency and controlled the degree of linear polarization of spontaneous emission .…”

Section: Introductionmentioning

confidence: 99%

An Etching‐Free Approach Toward Large‐Scale Light‐Emitting Metasurfaces

Brière

Héron

et al. 2019

Advanced Optical Materials

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These metasurfaces shape the wavefront by controlling its propagation with local subwavelength phase discontinuities. [4] From the earliest experiments, associated to the reflection of light on arrays of subwavelength metallic patches, [5][6][7] the concept of metasurfaces has rapidly evolved. It started from metallic metasurfaces working at a single wavelength to get to subwavelength high contrast gratings [8][9][10][11] and even subwavelength antenna arrays of various shapes and materials working over a large bandwidth. [12][13][14][15][16][17][18] Today, a broad operation wavelength range is accessible, going from THz down to the visible. Thanks to their reduced thicknesses and high transmission in the visible, the latest metasurface components could enable the next generation of flat optical devices. Large variety of examples of flat and small area components related to dielectric metasurfaces can be found in literature, showing impressive performances and unexpected effects, such as high transmission lenses with high numerical aperture (NA), polarization controlled properties and multiplexed optical information. [19][20][21][22][23][24][25][26][27][28][29] Until recently, metasurfaces have exclusively been considered as passive devices, i.e., their optical properties such as phase, amplitude and polarization responses were considered as fixed with respect to any change of environmental parameters. Their functionalities can be further expanded to a larger extent by designing tunable metasurfaces. Several attempts to achieve this tunability and switching have already been proposed, see for example the modification of the reflectivity and transmission through metasurfaces fabricated from or on the top of phase change materials such as vanadium dioxide, [30][31][32][33] chalcogenides based on germanium antimony telluride [34][35][36] and liquid crystals. [37][38][39] Going beyond the proof of principle of new functionalities and practically implementing these pioneering passive and active devices necessitates new materials, enabling reduced fabrication cost, increased productivity and even higher optical performances. On the other hand, nanofabrication of metasurfaces usually involves several processing steps such as dry etching that induce unavoidable defects degrading the device optical properties and performance.Gallium nitride, an already widespread semiconductor, is selected for the realization of our components, as it offers A new class of quasi 2D optical components, known as metasurfaces and exhibiting exceptional optical properties have emerged in recent years. The scattering properties of their subwavelength patterns allow molding the wavefront of light in almost any desired manner. While the proof of principle is demonstrated by various approaches, only a handful of low cost and fabrication friendly materials are suitable for practical implementations. To further develop this technology toward broadband application and industrial production, new materials and new fabrication methods are required. In a...

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“…Due to the above characteristics, the patch array can also be applied to beam focusing [17][18][19][20]. One of the most widely used applications of beam focusing is non-contact microwave sensing in which the energy should be confined within a small area [21,22].…”

Section: Introductionmentioning

confidence: 99%

Tunable Beam Steering, Focusing and Generating of Orbital Angular Momentum Vortex Beams Using High-Order Patch Array

et al. 2019

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In this paper, a tunable patch array based on high-order is proposed at the frequency of 300 GHz, achieving active controllable beam steering, focusing and generation of orbital angular momentum vortex beams. It has been demonstrated that the patch array can achieve wide beam scanning angle by controlling the phase of array elements with tunable phase shifters. Meanwhile, beam focusing on the specified position can also be realized by phase modulation of array elements based on the focusing theory. In addition, we also designed a patch array to generate vortex beams with multiple topological charges by high-order modes. The performances show that the patch antenna array we designed has a good application prospect.

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High-Efficiency Visible Transmitting Polarizations Devices Based on the GaN Metasurface

Cited by 39 publications

References 35 publications

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces

An Etching‐Free Approach Toward Large‐Scale Light‐Emitting Metasurfaces

Tunable Beam Steering, Focusing and Generating of Orbital Angular Momentum Vortex Beams Using High-Order Patch Array

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