Reconfigurable all-dielectric Fano metasurfaces for strong full-space intensity modulation of visible light

Kim, Sun-Je; Kim, Inki; Choi, Sungwook; Yoon, Hyong Seo; Kim, Changhyun; Lee, Yohan; Choi, Chanjoong; Son, Junwoo; Lee, Yong Wook; Rho, Junsuk; Lee, Byoungho

doi:10.1039/d0nh00139b

Cited by 30 publications

(18 citation statements)

References 59 publications

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“…Here, the vanadium dioxide undergoes a reversible insulator‐to‐metal transition at a temperature of ≈340 K close to room temperature, which provides exquisite sensitivity for electrical controllability upon resistive heating. [ 84–87 ] The Joule heating resulted from current flowing in the contact pads gradually short‐circuits the gap between a pair of CWs as VO 2 bridges become metallic, which leads to the formation of EIT resonance. To characterize the electrically controlled performance, the THz responses as a function of applied current are recorded in Figure a,b.…”

Section: Resultsmentioning

confidence: 99%

Spatiotemporal Terahertz Metasurfaces for Ultrafast All‐Optical Switching with Electric‐Triggered Bistability

Tong

et al. 2021

Laser & Photonics Reviews

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Optoelectronic terahertz switching achieved by dynamically tuning metamaterials is viewed as a major breakthrough in promoting the advancement of terahertz technology. However, the main thrust toward the development of ultrafast switchable components and optical logic operations is still in a catch‐up stage for progressively increasing information and communication demands. Here, a novel spatiotemporal metadevice is proposed for terahertz wave steering in multidimensional domains with ultrahigh spatial and ultrafast temporal manipulations. By spatially changing the interconnect architecture via the embedded vanadium dioxide bridges, the state of electromagnetically induced transparency resonance is switched between “1” and “0” states under electrical stimuli, exhibiting a typical 1 bit coding bistability with a long retention time. Furthermore, with the characteristic of writable/erasable logic operation, ultrafast photoswitching of each memorized state is manifested by delivering optical excitations. The high‐speed temporal response of terahertz radiation exhibits an on–off–on switching cycle within 16 ps, owing to the defect‐rich germanium photoactive layer. By leveraging both degrees of freedom in space and time domains, this multifunctional spatiotemporal metaphotonic device can upgrade and improve the current capabilities of optical computing, data storage, and ultrahigh‐speed information processing, paving the way for a highly unexplored territory toward manipulations of light.

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Section: Resultsmentioning

confidence: 99%

Spatiotemporal Terahertz Metasurfaces for Ultrafast All‐Optical Switching with Electric‐Triggered Bistability

Tong

et al. 2021

Laser & Photonics Reviews

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“…One particular structure we want to emphasize is metasurface‐based thermal emitters. Metasurfaces [ 37,76–82 ] show unparalleled capabilities on controlling light–mater interaction at the subwavelength scale by a simple array of meta‐atoms, greatly easing the fabrication complexity compared with their counterpart metamaterials. Structures, such as plasmonic perfect absorbers [ 83–91 ] and all‐dielectric absorbers, [ 92 ] can be optimized for achieving selective emitters by machine learning methods.…”

Section: Discussionmentioning

confidence: 99%

Photonics Empowered Passive Radiative Cooling

Zhang

Chu

Cai

et al. 2021

Advanced Photonics Research

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Passive radiative cooling has recently received renewed interest because of its unprecedented capabilities in cooling terrestrial objects below ambient air temperature without external energy consumption and greenhouse gas emission. This technology has been demonstrated as promising as replacements/complements of conventional compressed air‐based active cooling systems, which can significantly impact the global energy landscape by providing a green and efficient cooling way. The key to this success is judiciously designed photonic micro/nanostructures, which simultaneously reflect solar irradiation and emit thermal infrared emission across the atmospheric transparency window 8–13 μm. Herein, an introduction of the fundamental principles of passive radiative cooling is given, discussing the critical factors associated with the net cooling power of radiative cooling. Following this, the recently emerged photonic materials and structures (e.g., multilayer thin films, micro/nanoparticles, photonic crystals, metamaterials, metasurfaces, etc.) that facilitate radiative cooling are reviewed and fruitfully analyzed and discussed. Some possible scale‐up manufacturing ways toward the practical deployment of this energy‐efficient technology in real‐world applications are then discussed. The potential applications are also summarized and envisioned. Finally, perspectives on the future development in conjunction with artificial intelligent design of photonic structures and materials are presented and discussed.

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“…For reversible switching capabilities, however, this methodology can also be applied to vanadium dioxide (Figure S13, Supporting Information), which is a typical volatile phase‐change material and has been widely employed to construct dynamically tunable metadevices. [ 47,48 ]…”

Section: Figurementioning

confidence: 99%

Multistate Switching of Photonic Angular Momentum Coupling in Phase‐Change Metadevices

et al. 2020

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The coupling between photonic spin and orbital angular momenta is significantly enhanced at the subwavelength scale and has found a plethora of applications in nanophotonics. However, it is still a great challenge to make such kind of coupling tunable with multiple sates. Here, a versatile metasurface platform based on polyatomic phase‐change resonators is provided to realize multiple‐state switching of photonic angular momentum coupling. As a proof of concept, three coupling modes, namely, symmetric coupling, asymmetric coupling, and no coupling, are experimentally demonstrated at three different crystallization levels of structured Ge2Sb2Te5 alloy. In practical applications, coded information can be encrypted in asymmetric mode using the spin degree of freedom, while revealing misleading one without proper phase change or after excessive crystallinity. With these findings, this study may open an exciting direction for subwavelength electromagnetics with unprecedented compactness, allowing to envision applications in active nanophotonics and information security engineering.

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Reconfigurable all-dielectric Fano metasurfaces for strong full-space intensity modulation of visible light

Abstract: We demonstrated strong full-space modulation of visible intensities based on Fano resonances in all-dielectric VO2 metasurface gratings.

Cited by 30 publications

References 59 publications

Spatiotemporal Terahertz Metasurfaces for Ultrafast All‐Optical Switching with Electric‐Triggered Bistability

Spatiotemporal Terahertz Metasurfaces for Ultrafast All‐Optical Switching with Electric‐Triggered Bistability

Photonics Empowered Passive Radiative Cooling

Multistate Switching of Photonic Angular Momentum Coupling in Phase‐Change Metadevices

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