Modeling of optical forces in a speckle field

2021 ◽  
Author(s):  
Oleg V. Angelsky ◽  
Dmytro Ivanskyi ◽  
Vladyslav M. Tkachuk ◽  
Jun Zheng
Keyword(s):  
Optical Forces ◽  
Speckle Field

scholarly journals Integrated Double-Sided Random Microlens Array Used for Laser Beam Homogenization

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 673
Author(s):  
Wei Yuan ◽  
Cheng Xu ◽  
Li Xue ◽  
Hui Pang ◽  
Axiu Cao ◽  
...  
Keyword(s):  
Laser Beam ◽  
Microlens Array ◽  
Energy Utilization ◽  
Utilization Rate ◽  
Periodic Lattice ◽  
Lattice Distribution ◽  
Speckle Field ◽  
High Laser ◽  
Alignment Problem ◽  
In Series

Double microlens arrays (MLAs) in series can be used to divide and superpose laser beam so as to achieve a homogenized spot. However, for laser beam homogenization with high coherence, the periodic lattice distribution in the homogenized spot will be generated due to the periodicity of the traditional MLA, which greatly reduces the uniformity of the homogenized spot. To solve this problem, a monolithic and highly integrated double-sided random microlens array (D-rMLA) is proposed for the purpose of achieving laser beam homogenization. The periodicity of the MLA is disturbed by the closely arranged microlens structures with random apertures. And the random speckle field is achieved to improve the uniformity of the homogenized spot by the superposition of the divided sub-beams. In addition, the double-sided exposure technique is proposed to prepare the rMLA on both sides of the same substrate with high precision alignment to form an integrated D-rMLA structure, which avoids the strict alignment problem in the installation process of traditional discrete MLAs. Then the laser beam homogenization experiments have been carried out by using the prepared D-rMLA structure. The laser beam homogenized spots of different wavelengths have been tested, including the wavelengths of 650 nm (R), 532 nm (G), and 405 nm (B). The experimental results show that the uniformity of the RGB homogenized spots is about 91%, 89%, and 90%. And the energy utilization rate is about 89%, 87%, 86%, respectively. Hence, the prepared structure has high laser beam homogenization ability and energy utilization rate, which is suitable for wide wavelength regime.

scholarly journals Optical Forces at the Nanoscale: Size and Electrostatic Effects

Nano Letters ◽  
2017 ◽  
Vol 18 (1) ◽  
pp. 602-609 ◽  
Author(s):  
Paloma Rodríguez-Sevilla ◽  
Katarzyna Prorok ◽  
Artur Bednarkiewicz ◽  
Manuel I. Marqués ◽  
Antonio García-Martín ◽  
...  
Keyword(s):  
Optical Forces ◽  
Electrostatic Effects

scholarly journals Plasmonic linear nanomotor using lateral optical forces

2020 ◽  
Vol 6 (45) ◽  
pp. eabc3726
Author(s):  
Yoshito Y. Tanaka ◽  
Pablo Albella ◽  
Mohsen Rahmani ◽  
Vincenzo Giannini ◽  
Stefan A. Maier ◽  
...  
Keyword(s):  
Laser Beam ◽  
Incident Light ◽  
Lateral Force ◽  
Diffraction Limit ◽  
Propagation Direction ◽  
Optical Force ◽  
Optical Forces ◽  
Incident Laser ◽  
New Class ◽  
Force Direction

Optical force is a powerful tool to actuate micromachines. Conventional approaches often require focusing and steering an incident laser beam, resulting in a bottleneck for the integration of the optically actuated machines. Here, we propose a linear nanomotor based on a plasmonic particle that generates, even when illuminated with a plane wave, a lateral optical force due to its directional side scattering. This force direction is determined by the orientation of the nanoparticle rather than a field gradient or propagation direction of the incident light. We demonstrate the arrangements of the particles allow controlling the lateral force distributions with the resolution beyond the diffraction limit, which can produce movements, as designed, of microobjects in which they are embedded without shaping and steering the laser beam. Our nanomotor to engineer the experienced force can open the door to a new class of micro/nanomechanical devices that can be entirely operated by light.

Numerical studies of optical forces from adiabatic rapid passage

2011 ◽  
Vol 84 (1) ◽  
Author(s):  
Daniel Stack ◽  
John Elgin ◽  
Petr M. Anisimov ◽  
Harold Metcalf
Keyword(s):  
Optical Forces ◽  
Adiabatic Rapid Passage ◽  
Numerical Studies ◽  
Rapid Passage

scholarly journals Optical forces through guided light deflections

2013 ◽  
Vol 21 (1) ◽  
pp. 581 ◽  
Author(s):  
Darwin Palima ◽  
Andrew Rafael Bañas ◽  
Gaszton Vizsnyiczai ◽  
Lóránd Kelemen ◽  
Thomas Aabo ◽  
...  
Keyword(s):  
Optical Forces

Generalized Mie theory of optical forces

2012 ◽  
Vol 29 (4) ◽  
pp. 855 ◽  
Author(s):  
Alessandro Salandrino ◽  
Shima Fardad ◽  
Demetrios N. Christodoulides
Keyword(s):  
Mie Theory ◽  
Optical Forces

scholarly journals Dominant chiral optical forces in the vicinity of optical nanofibers

2016 ◽  
Vol 41 (20) ◽  
pp. 4735 ◽  
Author(s):  
M. H. Alizadeh ◽  
B. M. Reinhard
Keyword(s):  
Optical Forces
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