Results 51 to 60 of about 7,273,771 (379)

Off-Axis Co-Optical Path Large-Range Line Scanning Chromatic Confocal Sensor

Photonic Sensors
This article proposes a line scanning chromatic confocal sensor to solve the problem of limited chromatic confocal measurement due to the small measurement range and low measurement efficiency in the industrial inspection process.
Meizhong Liao, Yuqi Yang, Xiaolian Lu, Haiqi Li, Jun Zhang, Jinfeng Wang, Zhe Chen   +6 more
doaj   +1 more source

Information Theoretic Limits of Improved ACO-OFDM Receivers in Optical Intensity Channels With Time Dispersion

IEEE Open Journal of the Communications Society
From an information-theoretic perspective, we investigate performance of asymmetrically clipped optical OFDM (ACO-OFDM) in intensity modulated optical wireless systems.
Xiaozhen Liu, Jing Zhou, Wenyi Zhang
doaj   +1 more source

3D Visible‐Light Invisibility Cloak

Advanced Science, 2018
The concept of an invisibility cloak is a fixture of science fiction, fantasy, and the collective imagination. However, a real device that can hide an object from sight in visible light from absolutely any viewpoint would be extremely challenging to ...
Bin Zheng, Rongrong Zhu, Liqiao Jing, Yihao Yang, Lian Shen, Huaping Wang, Zuojia Wang, Xianmin Zhang, Xu Liu, Erping Li, Hongsheng Chen   +10 more
doaj   +1 more source

Experimental Comparison of PAM, CAP, and DMT Modulations in Phosphorescent White LED Transmission Link

IEEE Photonics Journal, 2015
In the paper, an experimental comparison of pulse amplitude, carrierless amplitude-phase, and discrete multitone modulations is carried in a visible light communications link employing white phosphorescent light-emitting diode (LED) as a transmitter.
G. Stepniak, L. Maksymiuk, J. Siuzdak
doaj   +1 more source

Integrated avalanche photodetectors for visible light

Nature Communications, 2021
Integrated photodetectors are essential for scalable photonic platforms, yet most efforts are concerted on the developing devices operating at infrared telecommunication wavelengths.
Salih Yanikgonul, Victor Leong, Jun Rong Ong, Ting Hu, Shawn Yohanes Siew, Ching Eng Png, Leonid Krivitsky   +6 more
doaj   +1 more source

DRL-Based IRS-Assisted Secure Visible Light Communications

IEEE Photonics Journal, 2022
In this paper, we develop a novel Physical Layer Security (PLS) technique for a Visible Light Communication (VLC) system composed of light fixtures assisted by mirror array sheets serving as Intelligent Reflecting Surfaces (IRS).
Danya A. Saifaldeen, Bekir S. Ciftler, Mohamed M. Abdallah, Khalid A. Qaraqe   +3 more
doaj   +1 more source

Near-infrared and visible light dual-mode organic photodetectors

Science Advances, 2020
A dual-mode photodetector with bias-switchable spectral response offers detection and monitoring in two distinct bands. We report a dual-mode organic photodetector (OPD) that has a trilayer visible light absorber/optical spacer/near-infrared (NIR) light ...
Zhaojue Lan, Yanlian Lei, W. Chan, Shuming Chen, D. Luo, F. Zhu   +5 more
semanticscholar   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Standardization of a new photodiagnosis method based on LEDs for patients with solar urticaria sensitive to visible light [PDF]

, 2015
Standard methods for photodiagnosis of solar urticaria are based in exposure of patient skin to different polychromatic UV and visible sources where minimal urticarial doses for different spectral bands (UVB and UVA) are established.
Aguilera-Arjona, Jose, Carrascosa, Jose Manel, De-Argila, Diego, De-Gálvez-Aranda, María Victoria, Gardeazabal, Jesús, Herrera-Ceballos, Enrique, Perez-Ferriols, Amparo, Rodríguez-Granados, Teresa   +7 more
core  

Using metallic photonic crystals as visible light sources

, 2012
In this paper we study numerically and experimentally the possibility of using metallic photonic crystals (PCs) of different geometries (log-piles, direct and inverse opals) as visible light sources. It is found that by tuning geometrical parameters of a
Belousov, Sergei, Bogdanova, Maria, Deinega, Alexei, Deng, Tao, Eiderman, Sergey, Lozovik, Yurii, Midha, Vikas, Polischuk, Ilya, Potapkin, Boris, Ramamurthi, Badri, Valuev, Ilya   +10 more
core   +1 more source