Extending the lateral trapping force of optical tweezers

2007 ◽  
Author(s):  
Andrew C. Richardson ◽  
S. Nader S. Reihani ◽  
Lene B. Oddershede
Keyword(s):  
Optical Tweezers ◽  
Trapping Force

Calculation of Maxwell Stress Tensor Using 3D FDTD for Trapping Force in Near-Field Optical Tweezers

2011 ◽  
Vol 697-698 ◽  
pp. 590-595 ◽  
Author(s):  
Bing Hui Liu ◽  
Li Jun Yan ◽  
Yang Wang
Keyword(s):  
Stress Tensor ◽  
Optical Tweezers ◽  
Near Field ◽  
Fdtd Method ◽  
Direct Calculation ◽  
Maxwell Stress ◽  
Nano Particle ◽  
Fiber Probe ◽  
Maxwell Stress Tensor ◽  
Trapping Force

New forms of trapping force are proposed for the design of near-field optical tweezers. Without the limitation of dipole approximation, the trapping force acting on a nano-particle located in near-field region can be solved by direct calculation of Maxwell stress tensor using 3D FDTD method. The new forms are used to design near-field optical trapping with a metal-coated fiber probe. Calculations show that the fiber probe can trap a nano-particle with tens of nanometres diameter to different positions with different distance from the probe tip. In order to achieve higher trapping capability, the feasibility of near-field trapping near the optical fiber probe after adding the AFM metallic probe is shown by analyzing trapping forces along three axis directions. The correctness of new forms is demonstrated by numerical results.

Haptic Feedback of Trapping Force in Manipulating Optical Tweezers

2007 ◽  
pp. 1309-1312
Author(s):  
Hirotsugu Minowa ◽  
Megumi Nakao ◽  
Tetsuo Sato ◽  
Tadao Sugiura ◽  
Kotaro Minato
Keyword(s):  
Optical Tweezers ◽  
Haptic Feedback ◽  
Trapping Force

Influence of slow light effect on trapping force in optical tweezers

2022 ◽  
Author(s):  
Jixiong Pu ◽  
Haotian Chen ◽  
Huichuan Lin ◽  
Philip Jones ◽  
Ziyang Chen ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Slow Light ◽  
Light Effect ◽  
Trapping Force

Evaluation of a Trapping Potential Measurement Technique for Optical Tweezers Using Simulations and Experiments

2009 ◽  
Author(s):  
Arvind Balijepalli ◽  
Thomas W. LeBrun ◽  
Jason J. Gorman ◽  
Satyandra K. Gupta
Keyword(s):  
Optical Tweezers ◽  
Measurement Method ◽  
Force Measurement ◽  
Optical Trap ◽  
Two Dimensions ◽  
Trapping Potential ◽  
Potential Measurement ◽  
Trapping Force ◽  
Dynamics Simulations ◽  
Trapping Forces

A technique to measure the trapping force in an optical tweezers, without making any prior assumptions about the trap shape, has been extended to two-dimensions. The response of a trapped micro or nanoparticle to a step input is measured and then used to calculate the trapping force experienced by the particle as a function of its position in the trap. Langevin dynamics simulations have been implemented to evaluate the performance of this measurement method in two-dimensions and to evaluate whether the particle’s motion away from the measurement plane due to diffusion gives rise to an error in the trapping force measurement. Preliminary experimental results are also presented to demonstrate this method in the laboratory. This force measurement method provides insight into the trapping behavior of micro and nanoparticles in an optical trap beyond the region, close to the trap center, where the trapping force is assumed to vary linearly with the particle’s displacement. The measured trapping forces, from simulations and laboratory experiments, are then integrated to recover the shape of the optical trapping potential.

Nanometric plasmonic optical trapping on gold nanostructures

2019 ◽  
Vol 86 (3) ◽  
pp. 30501
Author(s):  
Domna G. Kotsifaki ◽  
Mersini Makropoulou ◽  
Alexander A. Searfetinides
Keyword(s):  
Optical Tweezers ◽  
Single Molecule ◽  
Optical Trapping ◽  
Numerical Aperture ◽  
Resonance Wavelength ◽  
Objective Lens ◽  
Plasmonic Nanostructures ◽  
Theoretical Support ◽  
Trapping Force ◽  
Trapping Forces

The precise noninvasive optical manipulation of nanometer-sized particles by evanescent fields, instead of the conventional optical tweezers, has recently awaken an increasing interest, opening a way for investigating phenomena relevant to both fundamental and applied science. In this work, the optical trapping force exerted on trapped dielectric nanoparticle was theoretically investigated as a function on the trapping beam wavelength and as a function of several plasmonic nanostructures schemes based on numerical simulation. The maximum optical trapping forces are obtained at the resonance wavelength for each plasmonic nanostructure geometry. Prominent tunabilities, such as radius and separation of gold nanoparticles as well as the numerical aperture of objective lens were examined. This work will provide theoretical support for developing new types of plasmonic sensing substrates for exciting biomedical applications such as single-molecule fluorescence.

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