Results 141 to 150 of about 534,558 (401)

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source

A modal model for diffraction gratings [PDF]

, 2002
A description of an algorithm for a rather general modal grating calculation is presented. Arbitrary profiles, depth, and permittivity are allowed. Gratings built up from sub-gratings are allowed, as are coatings on the sidewalls of lines, and arbitrary complex structure. Conical angles and good conductors are supported.
arxiv   +1 more source

Improved 8-channel silicon mode demultiplexer with grating polarizers.

Optics Express, 2014
An improved 8-channel silicon mode demultiplexer is realized with TE-type and TM-type grating polarizers at the output ends, and these gratings serve as fiber-chip couplers simultaneously. The present 8-channel silicon mode demultiplexer includes a three-
Jian Wang, Pengxin Chen, Sitao Chen, Yaocheng Shi, D. Dai   +4 more
semanticscholar   +1 more source

Biocompatibility of Water‐Dispersible Pristine Graphene and Graphene Oxide Using a Close‐to‐Human Animal Model: A Pilot Study on Swine

Advanced Healthcare Materials, EarlyView.
Graphene‐based materials are attracting considerable interest for biomedical applications. Analysis of their biocompatibility is required before their clinical translation, and swine represents an excellent close‐to‐human model. This study evaluates the toxicological and immunological impact of pristine graphene and graphene oxide through a compendium ...
Paola Nicolussi, Giovannantonio Pilo, Maria Giovanna Cancedda, Guotao Peng, Ngoc Do Quyen Chau, Alejandro De la Cadena, Renzo Vanna, Yarjan Abdul Samad, Tanweer Ahmed, Jeremia Marcellino, Giuseppe Tedde, Linda Giro, Acelya Ylmazer, Federica Loi, Gavina Carta, Loredana Secchi, Silvia Dei Giudici, Simona Macciocu, Dario Polli, Yuta Nishina, Ciriaco Ligios, Giulio Cerullo, Andrea Ferrari, Alberto Bianco, Bengt Fadeel, Giulia Franzoni, Lucia Gemma Delogu   +26 more
wiley   +1 more source

Long period grating in multicore optical fiber: an ultra-sensitive vector bending sensor for low curvatures.

Optics Letters, 2014
Long period grating was UV inscribed into a multicore fiber consisting of 120 single mode cores. The multicore fiber that hosts the grating was fusion spliced into a single mode fiber at both ends.
P. Saffari, T. Allsop, Adedotum Adebayo, D. Webb, R. Haynes, M. Roth   +5 more
semanticscholar   +1 more source

Perovskite Light‐Emitting Diodes with Quantum Wires and Nanorods

Advanced Materials, EarlyView.
This review focuses on low‐dimensional perovskite materials and discusses their applications in light‐emitting diodes (LEDs). Special attention is given to the introduction of perovskite quantum wires and nanorods, two unique types of one‐dimensional (1D) materials, and their interesting optoelectronic properties.
Qianpeng Zhang, Daquan Zhang, Zebing Liao, Yang Bryan Cao, Mallem Kumar, Swapnadeep Poddar, Junchao Han, Ying Hu, Hualiang Lv, Xiaoliang Mo, Abhishek Kumar Srivastava, Zhiyong Fan   +11 more
wiley   +1 more source

Thin Film Stoichiometry and Defects Management for Low Threshold and Air Stable Near‐Infrared Perovskite Laser

Advanced Materials, EarlyView.
As defect density in 3D perovskites is controlled by adjusting excess formamidinium iodide concentration, shallow defects acts as a carrier sink for amplified spontaneous emission (ASE). A comprehensive charge carrier dynamic model is presented to understand the critical factor of the reduction of ASE threshold.
Chun‐Sheng Jack Wu, Andrea Olivati, Giulia Folpini, Heyong Wang, Annamaria Petrozza   +4 more
wiley   +1 more source

Higher dispersion and efficiency Bragg gratings for optical spectroscopy [PDF]

arXiv, 2018
Massively multiplexed spectroscopic stellar surveys such as MSE present enormous challenges in the spectrograph design. The combination of high multiplex, large telescope aperture, high resolution (R~40,000) and natural seeing implies that multiple spectrographs with large beam sizes, large grating angles, and fast camera speeds are required, with high
arxiv  

Bragg-Grating Enhanced Narrow-Band Spontaneous Parametric Down Conversion [PDF]

, 2009
We propose a new method to narrow the linewidth of entangled photons generated from spontaneous parametric down conversion (SPDC). An internal Bragg grating is incorporated onto a nonlinear optical crystal waveguide. We study theoretically the spectral characteristics of SPDC under two Bragg grating structures. We show that using the Bragg grating with
arxiv   +1 more source

Silicon mode multi/demultiplexer based on multimode grating-assisted couplers.

Optics Express, 2013
A simple and low-crosstalk 1 × 4 silicon mode (de)multiplexer based on multimode grating-assisted-couplers is proposed. Mode transitions can be flexibly controlled by designing the grating period at the phase-matching condition.
H. Qiu, Hui Yu, T. Hu, G. Jiang, Haifeng Shao, P. Yu, Jianyi Yang, Xiaoqing Jiang   +7 more
semanticscholar   +1 more source