All-optical switching in epsilon-near-zero asymmetric directional coupler

Sha, Yanhua; Xie, Ze Tao; Wu, Jiaye; Fu, H. Y.; Li, Qian

doi:10.1038/s41598-022-22573-7

Cited by 10 publications

(3 citation statements)

References 61 publications

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“…All-optical polarization switches with high speed have been realized in various materials, including semiconductors, plasmonic structures, nonlinear hyperbolic metamaterials, dielectric metasurfaces, and some epsilon-nearzero (ENZ) materials. [21][22][23][24][25][26] The metasurfaces fabricated by the metal and the semiconductor material can provide nonlinearities themselves, offering ultrafast nonlinearities due to its fast relaxation times for the carriers. For instance, Nicholls et al .…”

Section: Introductionmentioning

confidence: 99%

Hot‐Electron Driven Ultrafast Optical Polarization Conversion with Graphene‐Loaded Metasurface

Xu,

He,

Tang

et al. 2023

Laser & Photonics Reviews

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The switching speed of light polarization plays a crucial role in determining the upper‐limit bandwidth of applications like optical communications and laser microscopy. However, conventional polarization elements based on macroscopic anisotropic crystals like birefringent crystals and chalcogenide glasses are either static or restricted by the low switching time of about hundreds of picoseconds. Here, a femtosecond‐scale all‐optical polarization controlling method is proposed through engineering the excited hot electrons in a graphene‐loaded metasurface. Remarkably, a giant polarization orientation from left‐handed polarization (LCP) to right‐handed polarization (RCP) in the Poincaré sphere (≈80° rotation) is realized within only 200 fs in the mid‐infrared. With pumping, the dedicated polarization‐sensitive design allows the metasurface to exhibit a consistent resonance blueshift as the transient increase of the hot‐electron temperature in graphene for y‐polarized incidence. This polarization conversion approach features a giant modulation range and enables the reflected light to be dynamically and arbitrarily modulated into RCP, LCP, and linear states at femtosecond timescale. A few logic operations “AND”, “OR”, “NAND”, and “XOR” based on this method are also demonstrated by monitoring the normalized Stokes parameters. It is believed that this work may find practical application in next‐generation signal‐processing systems with large capacity.

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Section: Introductionmentioning

confidence: 99%

Hot‐Electron Driven Ultrafast Optical Polarization Conversion with Graphene‐Loaded Metasurface

Xu,

He,

Tang

et al. 2023

Laser & Photonics Reviews

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show abstract

“…Although abundant fabrication methods have been proposed for ultrafast all-optical switching, − existing methodologies to prepare nonlinear saturable materials and fabricate light-enhanced structures are mostly restricted to the material synthesis and processing method, ignoring the formation of controllable switching region and limiting the achievement of spatial opti-logic functions. Therefore, it is desirable to develop an advanced fabricating method to spatially write information for ultrafast all-optical switching with high efficiency, flexibility, and performance.…”

mentioning

confidence: 99%

Spatial Writing of Ultrafast All-Optical Switching

Ning,

Jiang,

Sun

et al. 2024

ACS Nano

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Writing spatial information on ultrafast all-optical switching is essential for constructing ultrafast processing units in photonic applications, such as optical communication and computing networks. However, most methods ignore the fabrication and imaging of controllable switching area, limiting its spatial information and the further design in ultrafast devices. Here, we propose a method to spatially write in ultrafast all-optical switching based on MAPbI 3 perovskite with nanocone structure and visualize the switching effect in arbitrary designed area. Due to the light confinement effect of nanocone fabrication using a fs laser, the light is strongly absorbed by perovskite and reach saturable absorption. It leads to ultrafast broadband transmittance change with 25 fs switching time and 10% modulation depth in nanocone perovskite area. Our preparation method offers high efficiency, performance, and flexibility for the spatial writing of ultrafast all-optical switching, which is promising for developing ultrafast all-optical networks and the next generation of communication technology.

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“…Therefore, this opens up a new paradigm for photonic applications taking advantage of the linear and nonlinear properties [23][24][25][26][27][28][29] . In particular, Sicompatible ENZ materials that can be integrated with silicon photonics circuits significantly reduce the cost and manufacturing complexities.…”

mentioning

confidence: 99%

Si-CMOS compatible epsilon-near-zero metamaterial for two-color ultrafast all-optical switching

Pianelli,

Dhama,

Judek

et al. 2024

Commun Phys

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Driven by the escalating demands of advanced technologies, developing integration strategies has kept pace with the realization of ultrafast components during the past two decades. Ultrafast all-optical switches enabled by artificial materials are considered at the forefront of the next generation of photonic integration for communications and high-volume data processing. Encouraged by these advancements, applications, and interest have increased toward all-optical switches based on epsilon-near-zero (ENZ) materials. However, some all-optical switches lack CMOS compatibility, require high energy activation, and are limited in switching speed and working wavelength. Here, we propose and demonstrate a multilayered ENZ metamaterial utilizing Si-compatible titanium nitride and indium-tin-oxide materials with two effective working wavelengths in the visible and near-infrared spectrum. This device enables switching time down to a few hundred femtoseconds utilizing minimal energy at the corresponding ENZ regions induced by intraband pumping. Our approach can enhance the adaptability of designing ENZ metamaterials for new hybrid integrated photonic components for low-power ultrafast all-optical terahertz modulation.

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All-optical switching in epsilon-near-zero asymmetric directional coupler

Cited by 10 publications

References 61 publications

Hot‐Electron Driven Ultrafast Optical Polarization Conversion with Graphene‐Loaded Metasurface

Hot‐Electron Driven Ultrafast Optical Polarization Conversion with Graphene‐Loaded Metasurface

Spatial Writing of Ultrafast All-Optical Switching

Si-CMOS compatible epsilon-near-zero metamaterial for two-color ultrafast all-optical switching

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