Multifunctional tunable gradient metasurfaces for terahertz beam splitting and light absorption

Erçağlar, Veysel; Hajian, Hodjat; Serebryannikov, Andriy E.; Özbay, Ekmel

doi:10.1364/ol.435197

Cited by 18 publications

(5 citation statements)

References 32 publications

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“…However, in the concept of digital metasurfaces, it has been shown that by employing binary or 1-bit ('0' and '1') elements with only π phase shift it is possible to achieve beam steering (see e.g. [63]). In case of active control over the binary elements, programmable metasurfaces are realized [23].…”

Section: Optical Design Of the Reprogrammable Metasurface Beam Steerermentioning

confidence: 99%

“…The most common examples of these active materials are liquid crystals [30,31], transparent conducting oxides, such as indium tin oxide (ITO) [32][33][34][35][36][37][38][39], III-V multiplequantum-wells [40], or phase change materials (PCMs), such as chalcogenide glasses (GST, GSST) [41][42][43][44][45][46] and vanadium dioxide (VO 2 ) [47][48][49][50][51][52][53][54][55][56][57]. To achieve active metasurfaces for the mid-infrared and far-infrared ranges, graphene [58], GST [59] and VO 2 [42,[60][61][62][63][64] are potential candidates.…”

Section: Introductionmentioning

confidence: 99%

“…This feature makes this material a promising candidate for energy-efficient devices. In the majority of the studies on VO 2 -based metasurfaces, the IMT was induced either by direct heating [47][48][49][50][51][52][53][54][55][56][57][60][61][62][63] or by optical pumping [42,64]. Another practical mechanism to achieve the IMT in VO 2 is electrical tuning [68].…”

Section: Introductionmentioning

confidence: 99%

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Reprogrammable metasurface design for NIR beam steering and active filtering

Hajian,

Proffit,

Ozbay

et al. 2024

J. Phys. D: Appl. Phys.

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Reprogrammable metasurfaces enable active modulation of light at subwavelength scales. Operating in the microwave, terahertz, and mid-infrared ranges, these metasurfaces find applications in communications, sensing, and imaging. Electrically tunable metasurfaces operating in the near-infrared (NIR) range are crucial for LiDAR applications. Achieving a NIR reprogrammable metasurface requires individual gating of nano-antennas, emphasizing effective heat management to preserve device performance. To this end, here we propose an electrically tunable Au-vanadium dioxide (VO2) metasurface design on top of a one-dimensional Si-Al2O3 photonic crystal (PC), positioned on a SiC substrate. Each individual Au-VO2 nano-antenna is switched from an Off to ON state via Joule heating, enabling the programming of the metasurface using 1-bit (binary) control. While operating as a nearly perfect reflector at λ_0=1.55 μm, the materials, thickness, and number of the layers in the PC are carefully chosen to ensure it acts as a thermal metamaterial. Moreover, with high optical efficiency (R~40% at λ_0), appropriate thermal performance, and feasibility, the metasurface also enables broadband programmable beam steering in the 1.4 μm-1.7 μm range for a wide steering angle range. This metasurface design also offers active control over NIR light transmittance, reflectance and absorptance in the wavelength range of 0.75 μm-3 μm. These characteristics render the device practical for LiDAR and active filtering.

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Section: Optical Design Of the Reprogrammable Metasurface Beam Steerermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reprogrammable metasurface design for NIR beam steering and active filtering

Hajian,

Proffit,

Ozbay

et al. 2024

J. Phys. D: Appl. Phys.

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“…More importantly, we figure out that Erçaglar et al proposed multifunctional tunable gradient MSs which were composed of a periodic array of binary Si microcylinders integrated with VO 2 and graphene for THz beam splitting and light absorption. [78] So, we try using an optically thick film of VO 2 as a bottom reflector (for the metallic phase) to obtain a multifunctional device, whose results are displayed in Figure 6b. It can be seen that most of the energy is reflected in this MS structure whose bottom metal plate is replaced with the VO 2 (for the metallic phase).…”

Section: The Realization Of the Eit Behaviormentioning

confidence: 99%

Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

Gao

Zhang

2022

Annalen der Physik

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A metasurface (MS) with switching features from electromagnetically induced transparency (EIT) to electromagnetically induced absorption (EIA) is theoretically investigated in the terahertz (THz) range by incorporating vanadium dioxide (VO2) when circular polarization‐insensitive circularly polarized waves are incidents, which can also simultaneously realize circular‐to‐linear polarization conversion well. While the VO2 ring is in an insulator state, two new transparent EIT windows both are gained between 0.97 THz and 1.16 THz because of destructive interference between the two metal rings that are seen as bright modes. Once the VO2 ring is tuned to the metallic state, a perfect EIA phenomenon is observed between 0.824 THz and 1.233 THz, achieving the transition from the EIT to EIA behavior well. The received electromagnetic waves are radiated to left‐handed circularly polarized (LCP) or right‐handed circularly polarized (RCP) waves with identical phases and amplitudes through the radiation patches when the LCP or RCP ones are incident. Whereby, a resultant linearly polarized wave is obtained between 0.9 THz and 1.2 THz, and relative bandwidth reaches 29%. The outcomes of maximal group index and group delay both are 1934 and 488 ps at 1.08 THz, and maximal absorption is 90.3% at 1.06 THz.

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“…Dielectric metasurfaces (DMs) have been recently employed for flat optics wavefront manipulation due to their low resonance-induced heating as compared to their plasmonic counterparts and CMOS-compatible fabrication processes [ 2 , 3 , 4 ]. Remarkably, asymmetric DMs composed of meta-atoms with broken in-plane inversion symmetry can support high-Q resonances originating from the symmetry-protected quasi-bound states in the continuum (q-BIC) [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

High-Figure-of-Merit Biosensing and Enhanced Excitonic Absorption in an MoS2-Integrated Dielectric Metasurface

et al. 2023

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Among the transitional metal dichalcogenides (TMDCs), molybdenum disulfide (MoS2) is considered an outstanding candidate for biosensing applications due to its high absorptivity and amenability to ionic current measurements. Dielectric metasurfaces have also emerged as a powerful platform for novel optical biosensing due to their low optical losses and strong near-field enhancements. Once functionalized with TMDCs, dielectric metasurfaces can also provide strong photon–exciton interactions. Here, we theoretically integrated a single layer of MoS2 into a CMOS-compatible asymmetric dielectric metasurface composed of TiO2 meta-atoms with a broken in-plane inversion symmetry on an SiO2 substrate. We numerically show that the designed MoS2-integrated metasurface can function as a high-figure-of-merit (FoM=137.5 RIU−1) van der Waals-based biosensor due to the support of quasi-bound states in the continuum. Moreover, owing to the critical coupling of the magnetic dipole resonances of the metasurface and the A exciton of the single layer of MoS2, one can achieve a 55% enhanced excitonic absorption by this two-port system. Therefore, the proposed design can function as an effective biosensor and is also practical for enhanced excitonic absorption and emission applications.

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Multifunctional tunable gradient metasurfaces for terahertz beam splitting and light absorption

Cited by 18 publications

References 32 publications

Reprogrammable metasurface design for NIR beam steering and active filtering

Reprogrammable metasurface design for NIR beam steering and active filtering

Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

High-Figure-of-Merit Biosensing and Enhanced Excitonic Absorption in an MoS2-Integrated Dielectric Metasurface

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