Results 71 to 80 of about 368,356 (303)

Photonic Engineering Enables All‐Passive Upconversion Imaging with Low‐Intensity Near‐Infrared Light

Advanced Functional Materials, EarlyView.
A passive upconversion imaging system enables the observation of scenes illuminated by low‐intensity incoherent near‐infrared light from 750 to 930 nm, by converting it into the visible without the use of external power. The upconverter is enabled by triplet–triplet annihilation in a bulk heterojunction, with absorption enhanced by plasmonic resonators
Rabeeya Hamid, Demeng Feng, Pournima Narayanan, Justin S. Edwards, Manchen Hu, Emma Belliveau, Minjeong Kim, Shenwei Yin, Sanket Deshpande, Chenghao Wan, Linda Pucurimay, David A. Czaplewski, Daniel N. Congreve, Mikhail A. Kats   +13 more
wiley   +1 more source

Optical Design of a Near-infrared Spectrograph Prototype for LAMOST

The Astronomical Journal
The Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) has demonstrated exceptional capability in optical spectroscopic surveys. To overcome its inherent limitations in observing late-type stars and regions of high extinction, we present ...
Xiaojie Zhang, Yonghui Hou, Jun Li, Haoran Yu, Hangxin Ji   +4 more
doaj   +1 more source

Analysis of the Optical Turbulence Model Using Meteorological Data

Remote Sensing, 2022
The model of atmosphere optical turbulence is important in the research field of laser atmospheric transmission, and plays a key role in astronomical site selection. In this paper, the single and overall statistical analysis between different outer scale
Manman Xu, Shiyong Shao, Ningquan Weng, Qing Liu   +3 more
doaj   +1 more source

Exploiting Two‐Photon Lithography, Deposition, and Processing to Realize Complex 3D Magnetic Nanostructures

Advanced Functional Materials, EarlyView.
Two‐photon lithography (TPL) enables 3D magnetic nanostructures with unmatched freedom in geometry and material choice. Advances in voxel control, deposition, and functionalization open pathways to artificial spin ices, racetracks, microrobots, and a number of additional technological applications.
Joseph Askey, Arjen van den Berg, Sandra Ruiz Gomez, Claire Donnelly, Dirk Grundler, Sam Ladak   +5 more
wiley   +1 more source

Alignment and bonding of silicon mirrors for high-resolution astronomical x-ray optics

Astronomical Telescopes + Instrumentation, 2018
Recent advances in the fabrication of silicon mirrors and their alignment and integration methods make it possible to build large-area, lightweight, high-resolution x-ray telescopes with arc-second angular resolution.
Kai-wing Chan, J. Mazzarella, T. Saha, Will Zhang, R. Mcclelland, M. Biskach, Peter M. Solly, R. Riveros, Ai Numata   +8 more
semanticscholar   +1 more source

Unprecedented Spin‐Lifetime of Itinerant Electrons in Natural Graphite Crystals

Advanced Functional Materials, EarlyView.
Graphite exhibits extraordinary spintronic potential, with electron spin lifetimes reaching 1,000 ns at room temperature ‐ over 100 times longer than graphene‐based devices. Magnetic resonance spectroscopy reveals strong anisotropy: out‐of‐plane spins live 50 times longer than their in‐plane counterparts.
Bence G. Márkus, Dávid Beke, Lili Vajtai, András Jánossy, László Forró, Ferenc Simon   +5 more
wiley   +1 more source

Astronomical demonstration of an optical vortex coronagraph

Optics Express, 2008
Using an optical vortex coronagraph and simple adaptive optics techniques, we have made the first convincing demonstration of an optical vortex coronagraph that is coupled to a star gazing telescope. We suppressed by 97% the primary star of a resolvable binary system, Cor Caroli. The stars had an angular separation of 1.9lambda/D at our imaging camera.
Grover A, Swartzlander, Erin L, Ford, Rukiah S, Abdul-Malik, Laird M, Close, Mary A, Peters, David M, Palacios, Daniel W, Wilson   +6 more
openaire   +2 more sources

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

GRAVITY: getting to the event horizon of Sgr A*

, 2008
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motions of matter close to the event horizon of Sgr A*, the massive black hole ...
Bartko, H., Baumeister, H., Berger, J. P., Boehm, A., Brandner, W., Cassaing, F., Clenet, Y., Dodds-Eden, K., Eckart, A., Eisenhauer, F., Fedou, P., Gendron, E., Genzel, R., Gillessen, S., Graeter, A., Hamaus, N., Haubois, X., Haug, M., Henning, T., Hippler, S., Hofmann, R., Hormuth, F., Houairi, K., Jocou, L., Kellner, S., Kervella, P., Klein, R., Kolmeder, J., Lacour, S., Laun, W., Lenzen, R., Malbet, F., Naranjo, V., Neumann, U., Paumard, T., Perraut, K., Perrin, G., Pfuhl, O., Rabien, S., Ramos, J. R., Richichi, A., Rohloff, R. -R., Rouan, D., Rousset, G., Schoeller, M., Straubmeier, C., Thiel, M., Ziegleder, J.   +47 more
core   +2 more sources

Impact of Lattice Heterogeneity on Broadband Optical Retardation in Stacked 2D Perovskite Single Crystals

Advanced Functional Materials, EarlyView.
It is shown that interfaces between organic and inorganic layers govern long‐range stacking disorder and in‐plane anisotropy in 2D metal‐halide perovskites. By comparing single‐cation AB‐AB and ordered mixed‐cation ABCD‐ABCD stackings, SCXRD reveals enhanced mosaicity, while optics confirm high birefringence.
Yixuan Dou, Nicholas Nici, Sunhao Liu, Xiaoming Wang, Yanfa Yan, Carla Slebodnick, Lina Quan   +6 more
wiley   +1 more source