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Ultrasensitive Near‐Infrared MoTe2 Photodetectors with Monolithically Integrated Fresnel Zone Plate Metalens

Taking advantages of miniaturization and integrability, all-dielectric TiO2 metalenses are designed based on Fresnel diffraction effect and integrated with molybdenum ditelluride (MoTe2) photodetectors. Owing to the enhancement of photon utilization efficiency, the corresponding integrated devices exhibit a high responsivity and detectivity of 135.0...

Tailoring Accidental Double Bound States in the Continuum in All‐Dielectric Metasurfaces

Accidental bound state in the continuum sketch and reflectance map. Bound states in the continuum (BICs) emerging in all-dielectric metasurfaces are attracting interest due to their sub-wavelength in-plane confinement with diverging Q-factor. Here, accidental BICs are studied through analytical formulas that allow to predict their positions in the spectral/angular...

Highly Sensitive and Topologically Robust Multimode Sensing on Spoof Plasmonic Skyrmions

A topologically robust and ultracompact multi-mode sensor based on spoof plasmonic skyrmions for characterizing dielectric materials in a wideband with ultrahigh sensitivity is reported. Together with the ability of easy integration and freely tunable design, these plasmonic skyrmions provide a very versatile platform for the design and fabrication...

All‐Optical Phase Recovery: Diffractive Computing for Quantitative Phase Imaging

A diffractive network that can perform all-optical phase recovery is demonstrated and the quantitative phase image (QPI) of an object is synthesized by converting the input phase information of a scene into intensity variations at the output. All-optical diffractive QPI networks enable power-efficient, high-frame-rate, and compact phase imaging systems...

Electrophoretic‐Driven In Situ Polymerization Depositing High‐Quality Perovskite Films for Photodetectors

Here the preparation of quantum dot films by electrophoretic deposition (EDP) is discussed. Conjugated linoleic acid (CLA) ligands are used to passivate defects on the surface of quantum dots, and then in situ polymerization can occur while assembling dense and ordered quantum dot films by electrophoretic deposition, which can better protect quantum...

Compressive Imaging Encryption with Secret Sharing Metasurfaces

Metasurface holography, visual cryptography (VC), and computational ghost imaging (CGI) are integrated to propose an encryption scheme, where both keys and ciphertext of CGI are hidden into the secret sharing metasurfaces in a high compression ratio of 4. Two images can be decoded by obtaining keys (i.e., superimposing two meta-images directly), and...

Dramatically Enhanced Second Harmonic Generation in Janus Group‐III Chalcogenide Monolayers

Shorter dipole moment in cation MM'X2 Janus structures leads to a larger built-in electric field, enabling dramatically enhanced out-of-plane second harmonic generation (SHG) response. Abstract 2D materials are excellent platforms for nonlinear optical (NLO) response, especially second harmonic generation (SHG), due to its large surface to volume...

Self‐Straining Nanocrystals Strategy: Temperature and Pressure Co‐Induced Phase Transitions of CsPbBr3 in Amorphous Matrices

A facile in situ method, based on the adjustable “self-straining effect”, is proposed to reveal the multiphysics co-induced structural evolution of nanocrystals (NCs). The whole phase transitions of CsPbBr3 NCs, including monoclinic, orthorhombic, tetragonal, cubic, amorphous are observed and clarified for the first time under the temperature and pressure...

Active Energy‐Efficient Terahertz Metasurfaces Based on Enhanced In‐Plane Electric Field Density

In-plane terahertz cavity confinement is more critical to surface conditions for manipulating light via active metasurfaces, thereby rendering the metasurface response more sensitive to low-energy optical stimuli. Enhancement in the cavity confinement by introducing additional capacitance in the metasurface unit cell makes the electromagnetic resonance...

Donor N‐Substitution as Design Principle for Fast and Blue Luminescence in Carbene‐Metal‐Amides

Gold-centered carbene-metal-amide materials with nitrogen substitution at various positions of the carbazole donor allow systematic control and variation of the charge transfer and locally excited states. Aza-substitution in para-position of the carbazole is a reliable strategy to realize bright, fast, and deep-blue luminescent materials while maintaining...

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