Results 81 to 90 of about 223,073 (288)
A Chirped Subwavelength Grating With Both Reflection and Transmission Focusing
IEEE Photonics Journal, 2013 A planar lens composed of a chirped subwavelength grating (CSG) structure with high numerical aperture (NA) was designed and analyzed in this paper. The reflectivity, transmission, and phase were calibrated as a function of the grating dimension using ...
Xiaomin Lv +7 more
doaj +1 more source
Advanced Functional Materials, EarlyView.Molten KNO2 treatment induces a lowrefractive index disordered carbon shell on fluorescent nanodiamonds, enhancing fluorescence emission while preserving spin coherence. Machine learningassisted correlative TEMPL enables direct single‐particle resolution of this enhancement relative to air‐oxidized nanodiamonds of similar morphology, establishing a ...
Parkarsh Kumar +10 more
wiley +1 more source
Thin metalens with high numerical aperture
Computer Optics, 2017 We designed, numerically simulated, fabricated and characterized a thin metalens in an amorphous silicon film. The lens has a diameter of 30 µm, a 633-nm focal length equal to the incident wavelength, a 220-nm period of the subwavelength features, and a 110-nm relief depth.
V. Kotlyar +4 more
openaire +1 more source
Advanced Functional Materials, EarlyView.Two pyridinium‐based ionic liquid templated hybrid manganese halides, (C4Py)2[MnCl4] and (C4Py)2[MnBr4], display similar bulk structures but show significantly different photoluminescence behaviors due to the bromine heavy‐atom effect. Their stable local Mn environments remain intact even in the molten state, allowing applications such as luminescence ...
Biswajit Bhattacharyya +22 more
wiley +1 more source
Numerical evaluation of the performance of different materials in nonlinear optical applications
Results in Physics, 2019 In this research paper, a D-shape structure of photonic crystal fiber (PCF) is introduced. Here, prime optical transmission characteristics like as nonlinearity, numerical aperture (NA), effective area, confinement loss are obtained by selecting finer ...
Bipul Biswas +4 more
doaj +1 more source
Energy Science & Engineering, 2020 The fluid‐solid coupling simulation of fractured coal and rock is helpful to study the influence of the fracture structure on the stress sensitivity of the permeability.
Yuandong Qiao +3 more
doaj +1 more source
Micro-optic lens for data storage [PDF]
A new type of microlens for data storage applications that has improved off-axis performance is described. The lens consists of a micro Fresnel pattern on a curved substrate. The radius of the substrate is equal to the focal length of the lens.
Erwin, J. Kevin +4 more
core +1 more source
Speckle‐Engineered Upconversion Amplification in Nanoemulsion‐Templated Hydrogel Microdomes
Advanced Functional Materials, EarlyView.Nanoemulsion‐confined PEGDA microdomes generate speckle‐like excitation fields that strongly amplify upconversion luminescence upon dehydration, enabling filter‐free visible readout with reversible on–off switching. DMD‐based lithography yields scalable, shape‐programmable arrays for moisture‐responsive displays and optical encryption.
Chaeyeong Ryu +13 more
wiley +1 more source
Applied SciencesIn order to investigate the effects of gravel particle size and geogrid aperture on the bearing performance of geosynthetic-encased stone columns, a discrete–continuum coupled numerical model was established based on laboratory test results, and a series
Jia Lu +4 more
doaj +1 more source
Advanced Functional Materials, EarlyView.Auxeticity‑by‑Assembly converts freeform photovoltaics from cut‑defined layouts to assembly‑defined systems. Standardized interlocking units generate negative‑Poisson‑ratio, reconfigurable architectures, while hinge regions are wired by selectively activatable AgNW–GO@EGaIn composite interconnects and a folding‑enabled interconnector layer. A decimeter‑
Seok Joon Hwang +15 more
wiley +1 more source