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

---

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

---

Intelligent metasurfaces: control, communication and computing

eLight, Journal Year: 2022, Volume and Issue: 2(1)

Published: May 6, 2022

Abstract Controlling electromagnetic waves and information simultaneously by metasurfaces is of central importance in modern society. Intelligent are smart platforms to manipulate the wave–information–matter interactions without manual intervention synergizing engineered ultrathin structures with active devices algorithms, which evolve from passive composite materials for tailoring wave–matter that cannot be achieved nature. Here, we review recent progress intelligent controls providing historical background underlying physical mechanisms. Then explore application developing novel wireless communication architectures, particular emphasis on metasurface-modulated backscatter communications. We also wave-based computing using metasurfaces, focusing emerging research direction sensing. Finally, comment challenges highlight potential routes further developments controls, communications computing.

Language: Английский

---

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

---

Metasurface-Driven Optically Variable Devices

Chemical Reviews, Journal Year: 2021, Volume and Issue: 121(21), P. 13013 - 13050

Published: Sept. 7, 2021

Optically variable devices (OVDs) are in tremendous demand as optical indicators against the increasing threat of counterfeiting. Conventional OVDs exposed to danger fraudulent replication with advances printing technology and widespread copying methods security features. Metasurfaces, two-dimensional arrays subwavelength structures known meta-atoms, have been nominated a candidate for new generation they exhibit exceptional behaviors that can provide more robust solution anti-counterfeiting. Unlike conventional OVDs, metasurface-driven (mOVDs) contain multiple responses single device, making them difficult reverse engineered. Well-known examples mOVDs include ultrahigh-resolution structural color printing, various types holography, polarization encoding. In this review, we discuss mOVDs. The fundamentals plasmonic dielectric metasurfaces presented explain how be manipulated. Then, monofunctional, tunable, multifunctional discussed. We follow up discussion fabrication needed realize these mOVDs, classified into prototyping manufacturing techniques. Finally, an outlook classification respect their capacity level. believe newly proposed concept may bring about era anticounterfeit leveraging novel concepts nano-optics nanotechnology.

Language: Английский

---

Tunable metasurfaces towards versatile metalenses and metaholograms: a review

Advanced Photonics, Journal Year: 2022, Volume and Issue: 4(02)

Published: March 7, 2022

Metasurfaces have attracted great attention due to their ability manipulate the phase, amplitude, and polarization of light in a compact form. Tunable metasurfaces been investigated recently through integration with mechanically moving components electrically tunable elements. Two interesting applications, particular, are vary focal point metalenses switch between holographic images. We present recent progress on focused metaholograms, including basic working principles, advantages, disadvantages each mechanism. classify stimuli based source electrical bias, as well others such thermal mechanical modulation. conclude by summarizing providing our perspectives for further development metasurfaces.

Language: Английский

---

Resonant leaky modes in all-dielectric metasystems: Fundamentals and applications

Physics Reports, Journal Year: 2023, Volume and Issue: 1008, P. 1 - 66

Published: Jan. 12, 2023

Language: Английский

---

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

---

Reconfigurable metasurfaces towards commercial success

Nature Photonics, Journal Year: 2022, Volume and Issue: 17(1), P. 48 - 58

Published: Dec. 22, 2022

Language: Английский

---

A Progress Review on Solid‐State LiDAR and Nanophotonics‐Based LiDAR Sensors

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(11)

Published: Aug. 11, 2022

Abstract Light detection and ranging (LiDAR) sensors enable precision sensing of an object in 3D. LiDAR technology is widely used metrology, environment monitoring, archaeology, robotics. It also shows high potential to be applied autonomous driving. In traditional sensors, mechanical rotator for optical beam scanning, which brings about limitations on their reliability, size, cost. These can overcome by a more compact solid‐state solution. Solid‐state are commonly categorized into the following three types: flash‐based LiDAR, microelectromechanical system (MEMS)‐based phased array (OPA)‐based LiDAR. Furthermore, advanced optics enables novel nanophotonics‐based devices with superior advantages utilized sensor. this review, sensor principles introduced, including schemes: pulsed time flight (TOF), amplitude‐modulated continuous wave TOF, frequency‐modulated wave. Recent advances conventional summarized presented, MEMS‐based OPA‐based The recent progress emerging covered. A summary made future outlook provided.

Language: Английский

---