Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material

Nature Nanotechnology, Journal Year: 2021, Volume and Issue: 16(6), P. 661 - 666

Published: April 19, 2021

Language: Английский

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Tunable nanophotonics enabled by chalcogenide phase-change materials

Nanophotonics, Journal Year: 2020, Volume and Issue: 9(5), P. 1189 - 1241

Published: May 1, 2020

Nanophotonics has garnered intensive attention due to its unique capabilities in molding the flow of light subwavelength regime. Metasurfaces (MSs) and photonic integrated circuits (PICs) enable realization mass-producible, cost-effective, highly efficient flat optical components for imaging, sensing, communications. In order nanophotonics with multi-purpose functionalities, chalcogenide phase-change materials (PCMs) have been introduced as a promising platform tunable reconfigurable nanophotonic frameworks. Integration non-volatile PCMs properties such drastic contrasts, fast switching speeds, long-term stability grants substantial reconfiguration more conventional static platforms. this review, we discuss state-of-the-art developments well emerging trends MSs PICs using PCMs. We outline material properties, structural transformation, electro-optic, thermo-optic effects well-established classes The deep learning-based approaches optimization analysis light-matter interactions are also discussed. review is concluded by discussing existing challenges adjustable perspective on possible area.

Language: Английский

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Reconfigurable all-dielectric metalens with diffraction-limited performance

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Feb. 22, 2021

Active metasurfaces, whose optical properties can be modulated post-fabrication, have emerged as an intensively explored field in recent years. The efforts to date, however, still face major performance limitations tuning range, quality, and efficiency especially for non mechanical actuation mechanisms. In this paper, we introduce active metasurface platform combining phase covering the full 2$\pi$ range diffraction-limited using all-dielectric, low-loss architecture based on change materials (O-PCMs). We present a generic design principle enabling switching of metasurfaces between two arbitrary profiles propose new figure-of-merit (FOM) tailored meta-optics. implement approach realize high-performance varifocal metalens operating at 5.2 $\mu$m wavelength. is constructed Ge2Sb2Se4Te1 (GSST), O-PCM with large refractive index contrast ($\Delta$ n > 1) unique broadband characteristics both amorphous crystalline states. reconfigurable features focusing efficiencies above 20% states linearly polarized light record ratio 29.5 dB. further validated aberration-free imaging states, which represents first experimental demonstration non-mechanical performance.

Language: Английский

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Programmable phase-change metasurfaces on waveguides for multimode photonic convolutional neural network

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Jan. 4, 2021

Neuromorphic photonics has recently emerged as a promising hardware accelerator, with significant potential speed and energy advantages over digital electronics, for machine learning algorithms such neural networks of various types. Integrated photonic are particularly powerful in performing analog computing matrix-vector multiplication (MVM) they afford unparalleled bandwidth density data transmission. Incorporating nonvolatile phase-change materials integrated devices enables indispensable programming in-memory capabilities on-chip optical computing. Here, we demonstrate multimode core consisting an array programable mode converters based on metasurface made materials. The programmable utilize the refractive index change material Ge-Sb-Te during phase transition to control waveguide spatial modes very high precision up 64 levels modal contrast. This contrast is used represent matrix elements, 6-bit resolution both positive negative values, perform MVM computation network algorithms. We convolutional that can image processing classification tasks accuracy. With broad operation compact device footprint, demonstrated toward large-scale processor high-throughput networks.

Language: Английский

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Electrical tuning of phase-change antennas and metasurfaces

Nature Nanotechnology, Journal Year: 2021, Volume and Issue: 16(6), P. 667 - 672

Published: April 19, 2021

Language: Английский

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Electrically driven reprogrammable phase-change metasurface reaching 80% efficiency

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: March 30, 2022

Phase-change materials (PCMs) offer a compelling platform for active metaoptics, owing to their large index contrast and fast yet stable phase transition attributes. Despite recent advances in phase-change metasurfaces, fully integrable solution that combines pronounced tuning measures, i.e., efficiency, dynamic range, speed, power consumption, is still elusive. Here, we demonstrate an situ electrically driven tunable metasurface by harnessing the full potential of PCM alloy, Ge2Sb2Te5 (GST), realize non-volatile, reversible, multilevel, fast, remarkable optical modulation near-infrared spectral range. Such reprogrammable presents record eleven-fold change reflectance (absolute reaching 80%), unprecedented quasi-continuous over 250 nm, switching speed can potentially reach few kHz. Our scalable heterostructure architecture capitalizes on integration robust resistive microheater decoupled from optically smart enabling good modal overlap with ultrathin layer largest sustain high scattering efficiency even after several reversible transitions. We further experimentally reconfigurable gradient capable steering incident light beam into different diffraction orders. This work represents critical advance towards development metasurfaces beamforming applications.

Language: Английский

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Ultra-low-energy programmable non-volatile silicon photonics based on phase-change materials with graphene heaters

Nature Nanotechnology, Journal Year: 2022, Volume and Issue: 17(8), P. 842 - 848

Published: July 4, 2022

Language: Английский

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Ultra-compact nonvolatile phase shifter based on electrically reprogrammable transparent phase change materials

PhotoniX, Journal Year: 2022, Volume and Issue: 3(1)

Published: Oct. 26, 2022

Abstract Optical phase shifters constitute the fundamental building blocks that enable programmable photonic integrated circuits (PICs)—the cornerstone of on-chip classical and quantum optical technologies [1, 2]. Thus far, carrier modulation thermo-optical effect are chosen phenomena for ultrafast low-loss shifters, respectively; however, state information they carry lost once power is turned off—they volatile. The volatility not only compromises energy efficiency due to their demand constant supply, but also precludes them from emerging applications such as in-memory computing. To circumvent this limitation, we introduce a shifting mechanism exploits nonvolatile refractive index upon structural transition Sb 2 Se 3 , bi-state transparent change material (PCM). A zero-static electrically-driven shifter realized on CMOS-backend silicon-on-insulator platform, featuring record up 0.09 π/µm low insertion loss 0.3 dB/π, which can be further improved streamlined design. Furthermore, demonstrate extinction ratio trimming ring resonators pioneer one-step partial amorphization scheme enhance speed PCM devices. diverse cohort devices demonstrated based ultra-compact shifter.

Language: Английский

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Non‐Volatile Reconfigurable Integrated Photonics Enabled by Broadband Low‐Loss Phase Change Material

Advanced Optical Materials, Journal Year: 2021, Volume and Issue: 9(9)

Published: March 4, 2021

Abstract Phase change materials (PCMs) have long been used as a storage medium in rewritable compact disk and later random access memory. In recent years, integration of PCMs with nanophotonic structures has introduced new paradigm for non‐volatile reconfigurable optics. However, the high loss archetypal PCM Ge 2 Sb Te 5 both visible telecommunication wavelengths fundamentally limited its applications. S 3 recently emerged wide‐bandgap transparency windows ranging from 610 nm to near‐IR. this paper, strong optical phase modulation low are experimentally demonstrated first time integrated photonic platforms at 750 1550 nm. As opposed silicon, thermo‐optic coefficient is shown be negative, making –Si hybrid platform less sensitive thermal fluctuation. Finally, microring switch which can tuned electrically between transmission state contrast over 30 dB. This work verifies prominent modification wavelength ranges relevant solid‐state quantum emitter telecommunication, enabling potential applications such field programmable gate array, post‐fabrication trimming, large‐scale network.

Language: Английский

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Silicon photonics for high-capacity data communications

Photonics Research, Journal Year: 2022, Volume and Issue: 10(9), P. A106 - A106

Published: June 3, 2022

In recent years, optical modulators, photodetectors, (de)multiplexers, and heterogeneously integrated lasers based on silicon platforms have been verified. The performance of some devices even surpasses the traditional III-V photonic circuit (PIC) platforms, laying foundation for large-scale integration. Silicon technology can overcome limitations transceiver in high-speed transmission networks to support faster interconnection between data centers. this article, we will review progress PICs. first part gives an overview achievements second introduces building blocks, including low-loss waveguides, passive devices, lasers, so on. third part, high-capacity transceivers is discussed. fourth give a chip.

Language: Английский

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