Results 11 to 20 of about 46,635 (50)

Multimodal Imaging in Stem Cell Therapy for Retinal Disease

Photonics
Stem cell therapy has emerged as a promising approach for treating various retinal diseases, particularly degenerative retinal diseases such as geographic atrophy in age-related macular degeneration (AMD), retinitis pigmentosa (RP), and Stargardt disease.
Mi Zheng, Yannis M. Paulus
doaj   +1 more source

Observation of higher-order deterministic optical vortices from random vortex beams

APL Photonics
Optical vortices in coherent beams have been identified as spiral phases with intensity nulls at singularities, while in random beams, they appear as coherence vortices in correlation functions, often not matching intensity nulls. Observing deterministic
Yonglei Liu, Siyu Xu, Peipei Peng, Yongtao Zhang, Siting Dai, Yahong Chen, Yangjian Cai, Fei Wang   +7 more
doaj   +1 more source

Asymmetry Analysis of the Autler–Townes Doublet in the Trap-Loss Fluorescence Spectroscopy of Cesium MOT with Single-Step Rydberg Excitation

Photonics
The Autler–Townes (AT) doublet, a fundamental manifestation of quantum interference effects, serves as a critical tool for studying the dynamic behavior of Rydberg atoms.
Xiaokai Hou, Yuewei Wang, Jun He, Junmin Wang   +3 more
doaj   +1 more source

Improved Optical Signal Processing with On-Chip Programmable Filter

Photonics
Bandwidth-limited transmitters have become a severe issue with the rapid growth of bandwidth-hungry services. We investigate the impact of an on-chip optical pre-emphasizer on a bandwidth-limited transmitter and quantitatively analyze the results of ...
Tiantian Li, Yumeng Liu, Luwen Xing, Shuo Lang, Zhangfeng Ge, Dongdong Han, Zhanqiang Hui, Huimin Du, Haowen Shu   +8 more
doaj   +1 more source

Effect of Lower-Level Relaxation on the Pulse Generation Performance of Q-Switched Nd:YAG Laser

Photonics
When analyzing and designing Q-switched Nd:YAG lasers, the impact of lower-energy-level relaxation on the pulse waveform is often ignored. This approximation typically does not result in significant deviations when the laser pulse duration is much longer
Fuqiang Ma, Shiyu Wang, Bingbin Li, Peijin Shang, Jinyou Li, Zheyuan Li   +5 more
doaj   +1 more source

Hybrid Method for Solving the Radiative Transport Equation

Photonics
The spherical harmonics method (PN method) is often used for solving the radiative transport equation in terms of analytical functions. A severe and unsolved problem in this context was the evaluation of the angle-resolved radiance near sources and ...
André Liemert, Dominik Reitzle, Alwin Kienle   +2 more
doaj   +1 more source

Dynamically Tunable Singular States Through Air-Slit Control in Asymmetric Resonant Metamaterials

Photonics
This study presents a novel method for dynamically tuning singular states in one-dimensional (1D) photonic lattices (PLs) using air-slit-based structural modifications. Singular states, arising from symmetry-breaking-induced resonance radiation, generate
Yeong Hwan Ko, Robert Magnusson
doaj   +1 more source

Adaptive Generation Method for Small Volume Easy Fabrication Freeform Unobscured Three-Mirror Systems Based on Machine Learning

Photonics
Freeform unobscured multiple-mirror systems have been widely applied in high-precision optical fields due to their high imaging quality and no chromatic aberration and central obstruction.
Yiwei Sun, Yangjie Wei, Ji Zhao
doaj   +1 more source

Series/Parallel Boost/Buck DC/DC Converter as a Visible Light Communication HB-LED Driver Based on Split Power

Photonics
This paper presents a high-brightness LED (HB-LED) driver for visible light communication (VLC) based on two converters. The first is a high-frequency buck DC/DC converter and the second is a low-frequency boost DC/DC converter, connected in series with ...
Daniel G. Aller, Diego G. Lamar, Juan R. Garcia-Mere, Marta M. Hernando, Juan Rodriguez, Javier Sebastian   +5 more
doaj   +1 more source

Optical Link Design for Quantum Key Distribution-Integrated Optical Access Networks

Photonics
To achieve commercial scalability, fiber-based quantum key distribution (QKD) systems must be integrated into existing optical communication infrastructures, rather than deployed exclusively on dedicated dark fibers.
Sunghyun Bae, Seok-Tae Koh
doaj   +1 more source