Broadband non-polarizing terahertz beam splitters with variable split ratio

Wei, Minggui; Xu, Quan; Wang, Qiu; Zhang, Xueqian; Li, Yanfeng; Tian, Zhen; Zhang, Xixiang; Han, Jiaguang; Zhang, Weili

doi:10.1063/1.4986538

Cited by 74 publications

(39 citation statements)

References 32 publications

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“…Working frequency Beam number Exit angle Gao et al [16] 0.8-2.0 THz variable invariable Headland et al [17] 1 THz 2 variable Wei et al [18] 0.6-1.0 THz 2 variable Lee et al [19] 0.58-1.00 THz 2 variable Yi et al [20] 0.22-0.30 THz 2 invariable Zhang et al [21] 0.8 ∼ 1. to [17][18][19][20][21][22][23].…”

Section: Beam Splittermentioning

confidence: 99%

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Terahertz Beam Splitter Based on I-Shaped Metasurface

Wu¹,

Wang²,

Chen³

et al. 2020

PIER M

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A linear polarization beam splitter operating in terahertz band is proposed and experimentally verified in this paper. The unit cell of the beam splitter is composed of the top "I" type metal pattern, the middle dielectric layer, and the bottom metal layer. Each subarray structure of the device consists of four unit cells that rotate progressively at an angle of 45 •. The horizontal and vertical sub-arrays form the gradient metasurface of 4 × 4. The incident linear polarized terahertz wave is reflected by the device and divided into four beams with approximately equal power, while having different propagating directions in the 0.18-0.30 THz band. The proposed terahertz beam splitter has the advantages of small size, low cost, and easy processing, and it can be applied to terahertz stealth and terahertz imaging.

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Section: Beam Splittermentioning

confidence: 99%

“…The beam splitter splits the incident wave into two beams with a variable angle. In 2017, Wei et al [18] proposed and designed an all dielectric metasurface terahertz beam splitter. Simulation and measurement results show that in the range of 0.6-1.0 THz, the incident terahertz wave can be split into two beams.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Beam Splitter Based on I-Shaped Metasurface

Wu¹,

Wang²,

Chen³

et al. 2020

PIER M

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“…[45] The aforementioned methods of using V-shaped antennas and the P-B phase are suitable only for controlling the phase of cross-polarized lights and are challenging to realize highefficiency beam deflectors. [66,87,88] Here, we focus on the discussion of the photonic spin Hall effect (PSHE), which is an important effect realized by metasurfaces. [19,[83][84][85] Figure 2c demonstrates a high-efficiency broadband anomalous reflection metasurface based on gap-plasmonic structures.…”

Section: Beam Deflectormentioning

confidence: 99%

Phase Manipulation of Electromagnetic Waves with Metasurfaces and Its Applications in Nanophotonics

Chen

Zhang

et al. 2018

Advanced Optical Materials

126

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elements. Thus, realizing phase manipulation of EM waves at the nanoscale has become a key pursuit for the development of modern optics and nanophotonics.Metamaterials are 3D artificial nanostructures composed of periodic subwavelength unit cells that resonantly couple to the incident EM waves, exhibiting effective electric and magnetic responses not found in nature. [1][2][3] However, these promising potential applications are hindered in their applications due to the challenges of fabricating the required complex 3D nanostructures and the inherent metallic losses and strong dispersion of plasmonic elements at optical frequencies. Planar metamaterials, or so-called metasurfaces, can be fabricated using existing technologies, such as the lithography method and have attracted increasing attention due to their feasibility, low loss, and ease of fabrication. [4,5] The most prominent advantage of metasurfaces is that they can generate spatial phase discontinuities over the full 2π range with an optically thin interface; moreover, the resolution is less than one wavelength. Thus, wavefronts can be shaped with a distance of much less than the wavelength. With the increasing development of metasurfaces, the aforementioned limitations can be solved using various ultrathin optical devices, which have properties superior to their conventional counterparts. [6][7][8][9][10][11][12] Here, we concentrate on the new capabilities of metasurfaces in recent years in manipulating the phase and propagation behaviors of EM waves. In Section 2, we briefly introduce the underlying mechanisms of three types of phase discontinuities. In Section 3, we review the basic applications of phase modulation using metasurfaces. In Section 4, we review more complex and advanced information photonics that have emerged from metasurfaces. In the last section, we provide concluding remarks and an outlook on future development directions. Three Basic Types of Phase Discontinuities Generated by Metasurfaces Resonance PhaseThe pioneering approach to achieve phase discontinuities was to use the dispersion of various metallic nanoantennas, as shown in the left panel of Figure 1a. The optical energy is coupled to surface EM waves propagating back and forth along the antenna surface. Due to the localized surface plasmon resonance, these waves are accompanied by oscillating free electrons Relative to conventional phase-modulation optical elements, metasurfaces (i.e., 2D versions of metamaterials) have shown novel optical phenomena and promising functionalities with more compact platforms and more straightforward fabrication processes. With the ability to generate a spatial phase variation, optical wavefronts can be manipulated into arbitrary shapes at will, enabling new phenomena and integrated ultrathin optical devices to be explored. This review is focused on recent developments regarding phase manipulation of electromagnetic waves with metasurfaces. Starting from their underlying physics for realizing full 2π phase manipulation, an overview of the applica...

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“…5(a). A fiber laser-based THz time-domain spectroscopy system [41] is utilized to characterize the samples. The splitting angles θ of the sample are measured for different parameters ϕ of x-or y-polarized THz wave.…”

Section: Increase Of Angular Degrees Of Freedom For Beam Splittingmentioning

confidence: 99%

Terahertz metamaterial beam splitters based on untraditional coding scheme

Xing

et al. 2019

Opt. Express

Self Cite

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Terahertz waves have attracted considerable research interest in recent years because of their potential applications in diverse fields. As an important device to control terahertz waves, beam splitters with greater flexibility and higher degrees of freedom are highly desirable. In order to obtain higher degrees of freedom in beam splitting, 2-bit or higher-bit coding elements are usually introduced into metamaterial beam splitters based on the coding theory. In this work, a new "offset" coding scheme using only the 1-bit coding elements of "0" and "1" is presented, and the period of coding for beam splitting can be a non-integer multiple of the length of a single unit rather than only its integer multiples. Therefore, more beam-splitting degrees of freedom can be obtained, and the design strategy is experimentally verified. We believe that the new coding scheme will also be of significance in radar cross section reduction and flexible wave control.

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Broadband non-polarizing terahertz beam splitters with variable split ratio

Abstract: FIG. 5. (a)-(f) Measured results of the asymmetric polarization-independent beam splitter under x and y polarizations with different d.

Cited by 74 publications

References 32 publications

Terahertz Beam Splitter Based on I-Shaped Metasurface

Terahertz Beam Splitter Based on I-Shaped Metasurface

Phase Manipulation of Electromagnetic Waves with Metasurfaces and Its Applications in Nanophotonics

Terahertz metamaterial beam splitters based on untraditional coding scheme

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