Numerical analysis of an ultra-broadband and highly efficient beam splitter in the visible region

Liu, Zhihui; Wu, Tong; Wang, Yiping; Liu, Yan; Li, Rui; Zhong, Xu; Yang, Dan; Yang, Zuning

doi:10.1364/oe.460001

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…Previously reported beam splitters were forwardly designed based on gradient metasurfaces [ 15 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], which can be implemented easily, although at the cost of low efficiency and small angle. Among these works, a highest splitting efficiency and maximum splitting angle were achieved by Liu et al [ 34 ], where the splitting efficiency and angle were 93.4% and 50°, respectively. Meanwhile, previous researchers mainly made efforts in achieving variable split ratio or polarization control.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, a design strategy that can realize high deflecting performance with less-consuming time is needed. As for the metasurface-based beam splitters, recent works were mainly conducted by utilizing forward design method to improve the splitting performance of gradient metasurfaces [ 15 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Among these beam splitters, a splitting efficiency of 93.4% was achieved, while the splitting angle was only 50° [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…As for the metasurface-based beam splitters, recent works were mainly conducted by utilizing forward design method to improve the splitting performance of gradient metasurfaces [ 15 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Among these beam splitters, a splitting efficiency of 93.4% was achieved, while the splitting angle was only 50° [ 34 ]. Few works were devoted to obtain high efficiency at wider angle by inverse design method.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting

et al. 2023

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Metasurfaces attracted extensive interests due to their outstanding ability to manipulate the wavefront at a subwavelength scale. In this study, we demonstrated quasi-freeform metasurfaces in which the radius, location, and height of the nanocylinder building blocks were set as optimized structure parameters, providing more degrees of freedom compared with traditional gradient metasurfaces. Given a desired wavefront shaping objective, these structure parameters can be collectively optimized utilizing a hybrid optimized algorithm. To demonstrate the versatility and feasibility of our method, we firstly proposed metasurfaces with deflecting efficiencies ranging from 86.2% to 94.8%, where the deflecting angles can vary in the range of 29°–75.6°. With further study, we applied our concept to realize a variety of high-efficiency, wide-angle, equal-power beam splitters. The total splitting efficiencies of all the proposed beam splitters exceeded 89.4%, where a highest efficiency of 97.6%, a maximum splitting angle of 75.6°, and a splitting uniformity of 0.33% were obtained. Considering that various deflecting angles, and various splitting channels with different splitting angles, can be realized by setting the optical response of metasurfaces as the optimization target, we believe that our method will provide an alternative approach for metasurfaces to realize desired wavefront shaping.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting

et al. 2023

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“…Our theory of NPGM provides a general design principle for multiple beam splitter. The beam splitters proposed before may use supercells of different sizes [65][66][67] or supercells with different number of meta-atoms [68]. The intensity of anomalous reflection could be modulated with the help of additional pump light [69].…”

Section: Reflection Patterns Based On Arrangements Of the Meta-atoms ...mentioning

confidence: 99%

Flat optics of nonuniform phase gradient metasurfaces

Pang,

Song,

Zhang

2024

Phys. Scr.

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Flat optics of uniform phase gradient metasurfaces based on the generalized Snell’s law has been extensively studied. The optics of nonuniform phase gradient metasurfaces (NPGMs) is less clear. Here based on Huygens’ principle and ﬁnite-diﬀerence time-domain (FDTD) simulation, we explore the optical properties of NPGMs made of nanorods (meta-atoms), which can be tuned by modulation of propagation phase and geometric phase. It is found that the nonuniformity of phase gradient may lead to multichannel anomalous reﬂection/refraction. The multiple beam splitters with arbitrary intensity ratio can be achieved by using the amplitude/phase modulation. Based on our design principle, we can obtain diﬀerent anomalous reﬂection patterns (with channels ±1, ±2, both ±1 and ±2, or no reﬂection at anomalous angle) by diﬀerent arrangement of just two types of meta-atoms. In addition, we are able to achieve chiral anomalous reﬂections for designed NPGMs made of nanorods and L-shaped nanoparticles. Our formulism provides general design guidance for NPGMs and can be used to realize the beam splitting function with adjustable angle and intensity ratio.

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High-efficiency, four-channel beam splitter based on a fishnet-shaped continuous metasurface

Liu¹,

wang²,

Wang

et al. 2022

Opt. Express

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Beam splitters play important roles in several optical systems. Due to the growing demand for the miniaturization of optical systems, it is necessary to design beam splitters with nanoscale dimensions to miniaturize the essential components for integrated optical circuits. In this work, we propose and numerically demonstrate a broadband, high efficient, and four-channel beam splitter based on a fishnet-shaped metasurface. The proposed structure is constructed of cruciform AlSb nanoantennas on the PDMS substrate. The simple design can split a beam of light into four beams with equal intensity, it achieves a conversion efficiency above 83%, and an anomalous transmission intensity exceeding 0.8 for the wavelength range of 761-835 nm. In this wavelength range, the beam splitting angle changes from 46.45° to 53.68°. Moreover, the four-channel beam splitter is tunable when the metasurface is designed as a discrete structure. At the wavelength of 874 nm, the beam splitting angle can be adjusted from 56.34° to 46.39° as the period increases from 1050 nm to 1207 nm by stretching the substrate. The presented metasurface might enable promising applications in integrated optical devices, owing to its advantages of multi-channel, wide broadband, high efficiency, and large beam split angle.

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Numerical analysis of an ultra-broadband and highly efficient beam splitter in the visible region

Cited by 7 publications

References 43 publications

Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting

Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting

Flat optics of nonuniform phase gradient metasurfaces

High-efficiency, four-channel beam splitter based on a fishnet-shaped continuous metasurface

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