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Optimal in-depth trapping by tuning the correction collar of a dry objective lens
, Article Journal of the Optical Society of America B: Optical Physics ; Volume 39, Issue 12 , 2022 , Pages 3209-3215 ; 07403224 (ISSN) ; Mahdavi, S. M ; Reihani, S. N. S ; Sharif University of Technology
Optica Publishing Group (formerly OSA)
2022
Abstract
Optical tweezers are proven and indispensable micro-manipulation tools. It is very common to use an immersion-assisted high NA objective for optical trapping of micrometer-sized beads. However, such objectives suffer from low working depth range. Here we show, both by theory and experiment, that a dry objective can be utilized for optimal trapping of even sub-micrometer objects. For the first time, to the best of our knowledge, we were able to stably trap polystyrene beads with radii of 270 and 175 nm in 3D using an objective with numerical aperture of 0.9. © 2022 Optica Publishing Group
Planar molecular dynamics simulation of metallic nanoparticles manipulation
, Article 2008 8th IEEE Conference on Nanotechnology, IEEE-NANO, Arlington, TX, 18 August 2008 through 21 August 2008 ; 2008 , Pages 163-164 ; 9781424421046 (ISBN) ; Meghdari, A ; Jalili, N ; Amiri, F ; Sharif University of Technology
2008
Abstract
The aim of this research is to conduct atomistic investigations of physical interaction analysis of nanoscale objects manipulation. The system consists of tip, particle and substrate. The manipulation tool moves with a constant speed while pushing the particle in a desired direction. The focus of the research is on ultra-fine metallic nanoparticles. To perform this research, Nose-Hoover dynamics and Sutton-Chen interatomic potential will be used to investigate the behavior of the aforementioned system which is made from different transition metals. The effects of size, material type and temperature on the success of the process have been investigated by planar molecular dynamics. © 2008 IEEE...