Results 61 to 70 of about 855,719 (327)

Optical Lenses for Atomic Beams [PDF]

, 2009
Superpositions of paraxial laser beam modes to generate atom-optical lenses based on the optical dipole force are investigated theoretically. Thin, wide, parabolic, cylindrical and circular atom lenses with numerical apertures much greater than those ...
A. E. Siegman, B. Ward, H. A. Haus, H. J. Metcalf, Ole Steuernagel   +4 more
core   +2 more sources

Diffraction-limited axial double foci and optical traps generated by optimization-free planar lens

Nanophotonics, 2020
Axial diffraction-limited multiple foci are a kind of investigated focal field for trapping multiple nano-particles. We first experimentally generated diffraction-limited axial double foci by optimization-free binary planar lens and theoretically ...
Ma Long, Guan Jian, Wang Yiqun, Chen Chen, Zhang Jianlong, Lin Jie, Tan Jiubin, Jin Peng   +7 more
doaj   +1 more source

Optical gradient force assist maneuver

Optics Letters, 2016
We describe an energy transfer process whereby a moving particle loses (or gains) kinetic energy upon interacting with the moving optical potential of a swept beam of light. This approach is akin to a gravitational assist maneuver for interplanetary satellite propulsion. Special consideration is given to the stopping condition.
Alexandra B, Artusio-Glimpse, Jacob H, Wirth, Grover A, Swartzlander   +2 more
openaire   +2 more sources

Attractive optical forces from black–body radiation [PDF]

Optics in the Life Sciences, 2013
Blackbody radiation around hot objects induces ac Stark shifts of the energy levels of nearby atoms and molecules. These shifts are roughly proportional to the fourth power of the temperature and induce a force decaying with the third power of the distance from the object.
M. Sonnleitner, M. Ritsch-Marte, H. Ritsch   +2 more
openaire   +3 more sources

Multiple Beam Laser Guidance for Patterning Irregularly Shaped Cells

Frontiers in Physics, 2020
Laser cell patterning is a distinctly effective technique for creating cell arrangements in culture that replicate in vivo tissue structure for studying contact-mediated cell-cell interactions. Conventional laser-based single-cell-manipulation techniques
Lucas Schmidt, Zhonghai Wang, Xiaoqi Yang, Tong Ye, Thomas K. Borg, Yonghong Shao, Bruce Z. Gao   +6 more
doaj   +1 more source

Numerical and Experimental Investigation on the Optical Manipulation from an Axicon Lensed Fiber

Micromachines, 2021
Here we numerically and experimentally studied the optical trapping on a microsphere from an axicon lensed fiber (ALF). The optical force from the fiber with different tapered lengths and by incident light at different wavelengths is calculated ...
Wu Zhang, Yanxiao Lin, Yusong Gao, Zekai Guo, Xiangling Li, Yuhong Hu, Pengcai Dong, Qifan Zhang, Xiaohui Fang, Meng Zhang   +9 more
doaj   +1 more source

A Comparative Study of Cerebral Oxygenation During Exercise in Hemodialysis and Peritoneal Dialysis Patients

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou, Konstantina Dipla, Danai Faitatzidou, Fotini Iatridi, Areti Georgiou, Artemios Karagiannidis, Erasmia Sampani, Chrysostomos Dimitriadis, Aggelos Koutlas, Andreas Zafeiridis, Pantelis Sarafidis   +10 more
wiley   +1 more source

Integrated Hybrid Tweezer for Particle Trapping with Combined Optical and Acoustic Forces

Applied Sciences, 2023
We propose an on-chip integrated hybrid tweezer that can simultaneously apply optical and acoustic forces on particles to control their motions. Multiple potential wells can be formed to trap particles, and the acoustic force generated by an interdigital
Sen Li, Xin Tong, Lutong Cai, Lin Zhang
doaj   +1 more source

Predicting the Future Burden of Renal Replacement Therapy in Türkiye Using National Registry Data and Comparative Modeling Approaches

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Chronic kidney disease is a growing public health problem worldwide, and the number of patients requiring renal replacement therapy is steadily increasing. Türkiye has experienced a similar rise in both the incidence and prevalence of renal replacement therapy over the past decades; however, national‐level projections of future ...
Arzu Akgül, Neriman Sıla Koç, Berrak Itır Aylı   +2 more
wiley   +1 more source

Mechanisms of parasite‐mediated disruption of brain vessels

FEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira, Sílvia Arroz‐Madeira, Cláudio A. Franco, Sara Silva Pereira   +3 more
wiley   +1 more source