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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Nonvolatile programmable silicon photonics using an ultralow-loss Sb ₂ Se ₃ phase change material

Science Advances, Journal Year: 2021, Volume and Issue: 7(25)

Published: June 16, 2021

An ultralow-loss optical phase change material enables reversible programming of the flow light in silicon photonics.

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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Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications

ACS Nano, Journal Year: 2022, Volume and Issue: 16(9), P. 13339 - 13369

Published: Aug. 17, 2022

Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past decade, tremendous efforts have been made develop various active materials and incorporate them into functional devices for practical applications, pushing research tunable metasurfaces forefront nanophotonics. Those include phase change (PCMs), semiconductors, transparent conducting oxides (TCOs), ferroelectrics, liquid crystals (LCs), atomically thin material, etc., enable intriguing performances such as fast switching speed, large modulation depth, ultracompactness, significant contrast optical properties under external stimuli. Integration offers substantial tunability conventional passive nanophotonic platforms. Tunable with multifunctionalities triggered stimuli bring in rich degrees freedom terms material choices device designs dynamically manipulate control EM on demand. This field has recently flourished burgeoning development physics design methodologies, particularly those assisted emerging machine learning (ML) algorithms. review outlines recent advances tuning mechanisms, applications. We conclude this paper providing future perspectives vibrant fast-growing field.

Language: Английский

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Recent Advances and Future Prospects for Memristive Materials, Devices, and Systems

ACS Nano, Journal Year: 2023, Volume and Issue: 17(13), P. 11994 - 12039

Published: June 29, 2023

Memristive technology has been rapidly emerging as a potential alternative to traditional CMOS technology, which is facing fundamental limitations in its development. Since oxide-based resistive switches were demonstrated memristors 2008, memristive devices have garnered significant attention due their biomimetic memory properties, promise significantly improve power consumption computing applications. Here, we provide comprehensive overview of recent advances including devices, theory, algorithms, architectures, and systems. In addition, discuss research directions for various applications hardware accelerators artificial intelligence, in-sensor computing, probabilistic computing. Finally, forward-looking perspective on the future outlining challenges opportunities further innovation this field. By providing an up-to-date state-of-the-art review aims inform inspire

Language: Английский

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A review on carbon-based phase change materials for thermal energy storage

Journal of Energy Storage, Journal Year: 2022, Volume and Issue: 50, P. 104166 - 104166

Published: Feb. 14, 2022

Language: Английский

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Dynamic Hybrid Metasurfaces

Nano Letters, Journal Year: 2021, Volume and Issue: 21(3), P. 1238 - 1245

Published: Jan. 22, 2021

Efficient hybrid plasmonic-photonic metasurfaces that simultaneously take advantage of the potential both pure metallic and all-dielectric nanoantennas are identified as an emerging technology in flat optics. Nevertheless, post-fabrication tunable still elusive. Here, we present a reconfigurable metasurface platform by incorporating phase-change material Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) into metal-dielectric meta-atoms for active non-volatile tuning properties light. We systematically design reduced-dimension meta-atom, which selectively controls fundamental resonances via dynamic change optical constants GST without compromising scattering efficiency. As proof-of-concept, experimentally demonstrate miniaturized control amplitude phase incident light necessary high-contrast switching anomalous to specular beam deflection, respectively. Finally, leverage deep learning-based approach intuitive low-dimensional visualization enhanced range response reconfiguration enabled addition GST. Our findings further substantiate dynamically promising candidates development small-footprint energy harvesting, imaging, signal processing devices.

Language: Английский

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Integrated optical memristors

Nature Photonics, Journal Year: 2023, Volume and Issue: 17(7), P. 561 - 572

Published: May 29, 2023

Language: Английский

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