Dynamic beam splitter employing an all-dielectric metasurface based on an elastic substrate

Koçer, Hasan; Durna, Yilmaz; Kurt, Hamza; Özbay, Ekmel

doi:10.1364/ol.392872

Cited by 14 publications

(8 citation statements)

References 38 publications

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“…Previous work mainly focused on varying the beam splitting number, switching the deflection angles of different beams, or simultaneously modulating the intensity of beams, but active beam splitters with an adjustable split ratio have rarely been reported. In 2020, Kocer et al presented a dynamic beam splitter employing an elastic substrate based all-dielectric metasurface to undergo splitting in three ways with different split angles and power ratios [ 25 ]. However, a dynamic beam splitter that can change the split ratio and maintain the same split angles has not yet been developed.…”

Section: Introductionmentioning

confidence: 99%

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

et al. 2022

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The beam splitter is an important functional device due to its ability to steer the propagation of electromagnetic waves. The split-ratio-variable splitter is of significance for optical, terahertz and microwave systems. Here, we are the first (to our knowledge) to propose an optically controlled dynamic beam splitter with adjustable split ratio in the terahertz region. Based on the metasurface containing two sets of reversed phase-gradient supercells, we split the terahertz wave into two symmetrical beams. Associated with the reconfigurable pump laser pattern programmed with the spatial light modulator, dynamic modulation of the split ratio varying from 1:1 to 15:1 is achieved. Meanwhile, the beam splitter works at a split angle of 36° for each beam. Additionally, we obtain an exponential relationship between the split ratio and the illumination proportion, which can be used as theoretical guidance for beam splitting with an arbitrary split ratio. Our novel beam splitter shows an outstanding level of performance in terms of the adjustable split ratio and stable split angles and can be used as an advanced method to develop active functional devices applied to terahertz systems and communications.

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Section: Introductionmentioning

confidence: 99%

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

et al. 2022

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“…Another way to achieve tunable metasurfaces is to directly change the configuration of the metasurfaces, which can be achieved by combining metasurfaces with flexible substrates, such as embedding resonator arrays in flexible substrates or fabricating resonator arrays on flexible substrates. By applying mechanical stretching to the flexible substrates to change the geometric parameters of the metasurfaces, in-fine, dynamic control of the optical response can be achieved [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Since the optical properties of such metasurfaces are sensitive to changes in their shape and size, they have potential applications in the shape or displacement detection of objects [ 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

“…Although many novel functions have been realized based on flexible optical metasurfaces, most flexible metasurfaces are currently only applied to the control of transmission, reflection, absorption, or resonance frequency [ 29 , 30 , 31 , 32 , 33 , 34 ]. There are few studies on the modulation of light wavefront [ 35 , 36 ]. As for multifunctionality, the most straightforward approach is to merge multiple single-function metasurfaces [ 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Multifunctional Tunable Metasurface Assisted by Elastic Substrate

Fan

et al. 2022

Nanomaterials

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Metasurfaces with both multifunctionality and tunability hold great application potential in next-generation optical devices. In this paper, we propose a stretchable metasurface composed of arrays of identical dielectric rectangular resonators embedded in the polydimethylsiloxane (PDMS) substrate. It is shown that the metasurface possesses three functions at the operating wavelength of 532 nm. The switching of functions can be implemented by changing the period Px of the metasurface, induced by stretching the PDMS substrate along the x-direction. When the period Px is less than the operating wavelength of 532 nm, the behavior of metasurface can switch between transmissive window and reflective mirror. When the period Px of the metasurface varies from 532 nm to 700 nm, the metasurface act as a dynamic equal-power beam splitter with conversion efficiency higher than 90%, and the corresponding splitting angle can be adjusted from 90° to around 49.5°. Moreover, we achieve the switching of transmissive window/reflective mirror/split-ratio-variable splitter based on the metasurface consisting of arrays of identical L-shaped resonators embedded in the PDMS substrate.

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“…and high-refractive-index dielectric materials have been recently developed to replace plasmonic metasurfaces to remove conductor loss. [27][28][29][30][31][32][33][34][35][36][37] Various optical dielectric metasurface devices have been demonstrated, such as metalenses, [27,28] beam splitters, [29][30][31] polarization converters, [32][33][34] and vortex beam generators. [35][36][37] However, limited progress has been achieved in dielectric metasurfaces in the THz band due to the challenging fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

Compact Terahertz Dielectric Folded Metasurface

Zhu

Pang

et al. 2021

Advanced Optical Materials

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Despite modern terahertz (THz) systems benefit from the developments in metasurfaces with flexible wavefront manipulation capabilities, the large propagation space between the THz source/detector and metasurface component, as well as the inherent insertion loss of metasurfaces, are the two main bottlenecks that hinder metasurface‐based THz devices from becoming a practical technology. This article addresses these two problems by demonstrating a compact, high‐efficiency folded metasurface system in the THz band. The device comprises two parallel dielectric metasurfaces, between which the THz waves are confined to reduce the system volume. The bottom reflective metasurface consists of an array of anisotropic dielectric resonators, which can simultaneously manipulate THz waves’ phase and polarization properties. The upper metasurface is a dielectric Bragg polarizer that selects the desired linear polarization of THz waves to pass through. Low‐loss and nondispersive high‐resistivity silicon is used as the material for both metasurfaces in this design, which is essential to achieving high efficiency. The compact and high‐efficiency folded THz metasystem is further experimentally verified. The introduced folded device can be used in diverse applications such as high‐speed THz communications, non‐destructive detection, and imaging systems, significantly reducing their volume and increasing their radiation efficiency.

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Dynamic beam splitter employing an all-dielectric metasurface based on an elastic substrate

Cited by 14 publications

References 38 publications

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio

Design of Multifunctional Tunable Metasurface Assisted by Elastic Substrate

Compact Terahertz Dielectric Folded Metasurface

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