Advanced Optical Materials

Wiley Online Library : Advanced Optical Materials

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Broadband Ultrafast Dynamics of Refractory Metals: TiN and ZrN

Broadband ultrafast pump–probe measurements of titanium nitride and zirconium nitride films reveal sub‐picosecond optical dynamics in the epsilon‐near‐zero window and large lattice heating. This finding is attributed to transiently modulated electron energy distributions, which effect interband oscillator strength and strong electron–phonon coupling...

Solution‐Grown Large‐Sized Single‐Crystalline 2D/3D Perovskite Heterostructure for Self‐Powered Photodetection

Single‐crystalline 2D/3D perovskite heterostructure with well‐defined interface is achieved via a delicate solution method. Strikingly, the resultant photodetector exhibits excellent performance at zero bias, including a large on/off switching radio (≈105), high detectivity (≈1012), and fast response time (600/600 µs). This work paves a way to explore...

Silicon‐Based Terahertz Meta‐Devices for Electrical Modulation of Fano Resonance and Transmission Amplitude

A novel and economical scheme based on silicon‐integrated terahertz asymmetric metallic split ring metamaterial is proposed to control Fano resonance and transmission amplitude via electrical excitation. As the current bias is increased, both the thickness and conductivity of silicon carrier layer are modulated simultaneously. The depth range of modulated...

Large Lead‐Free Perovskite Single Crystal for High‐Performance Coplanar X‐Ray Imaging Applications

A lead‐free inch‐sized (34.3 × 34.3 × 13.1 mm3) high‐quality (CH3NH3)3Bi2I9 single crystal (MA3Bi2I9 SC) with higher resistivity, lower ion migration and better stability is presented. The coplanar MA3Bi2I9 SC detector shows outstanding X‐ray response performance, long‐term working stability and excellent uniformity. Thanks to these excellent properties,...

High‐Resolution 3D Printed Photonic Waveguide Devices

3D photonic devices fabricated using two‐photon polymerization laser lithography, including high‐resolution photonic waveguides, Bragg gratings and resonators are demonstrated. High‐quality spiral and air‐bridge waveguides providing 3D light guiding, unique couplers with 1.6 dB coupling loss and large 3 dB bandwidth are also demonstrated. The waveguides...

Advancing Metal‐Organic Frameworks toward Smart Sensing: Enhanced Fluorescence by a Photonic Metal‐Organic Framework for Organic Vapor Sensing

Metal‐organic frameworks are distinguished as ultrahigh porous materials with an exceptional ability to detect various toxic chemicals through fluorescence. In this study, it is shown that the photonic structure of zeolitic imidazolate framework‐8 further demonstrates the ability to intensify the fluorescence of an adsorbed fluorescent dye toward a...

Tailored Optical Functionality by Combining Electron‐Beam and Focused Gold‐Ion Beam Lithography for Solid and Inverse Coupled Plasmonic Nanostructures

The combination of electron‐beam and gold ion‐beam lithography as an alternative and highly versatile route for the fabrication of complex and high fidelity plasmonic nanostructures is introduced. The combination of the two techniques makes full use of their complementary capabilities, which is demonstrated on a selection of planar and 3D nanostructures...

Advanced Optical Materials for Sunlight Control in Greenhouses

Adaptive greenhouses capable of responding to changes in natural sunlight conditions can maximize the growth conditions for plants by continually controlling the intensity, color, and distribution of incident light. This review extrapolates on potential materials and device architectures that could be transplanted from the built environment to the world...

Electrodeposited Negative Index Metamaterials with Visible and Near Infrared Response

A scalable fabrication approach of negative index metamaterials is presented based on soft nanoimprinting and electrodeposition. Gold–air stacks perforated with dielectric pillars constitute the resulting fishnet metamaterials. Transparent conductive oxides are used as substrates, facilitating device implementation. A thorough analysis demonstrates...

Impact of the Energetic Landscape on Polariton Condensates' Propagation along a Coupler

The propagation of polariton condensates along a non‐straight circuit is reported. The polariton dispersion relations at different positions along a doubly bent waveguide are measured in both the linear and nonlinear regimes and compared with mean‐field‐based numerical simulations. A slowdown of the polariton speed is found when the particles cross...

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