Teoretické srovnání optických pastí vytvořených stojatím vlněním

Theoretical comparsion of optical traps created by standing wave and single beam

článek v časopise - ostatní, Jost

en

We used generalised Lorenz-Mie scattering theory (GLMT) to compare submicron-sized particle optical trapping in a single focused beam and a standing wave. We focus especially on the study of maximal axial trapping force, minimal laser power necessary for confinement, axial trap position, and axial trap stiffness in dependency on trapped sphere radius, refractive index, and Gaussian beam waist size. In the single beam trap (SBT), the range of refractive indices which enable stable trapping depends strongly on the beam waist size (it grows with decreasing waist). On the contrary to the SBT, there are certain sphere sizes (non-trapping radii) that disable sphere confinement in standing wave trap (SWT) for arbitrary value of refractive index. For other sphere radii we show that the SWT enables confinement of high refractive index particle in wider laser beams and provides axial trap stiffness and maximal axial trapping force at least by two orders and one order bigger than in SBT, respectively. (C) 2003 Elsevier Science B.V. All rights reserved.

Článek pojednává o teoretické srovnání optických pastí vytvořených stojatím vlněním

We used generalised Lorenz-Mie scattering theory (GLMT) to compare submicron-sized particle optical trapping in a single focused beam and a standing wave. We focus especially on the study of maximal axial trapping force, minimal laser power necessary for confinement, axial trap position, and axial trap stiffness in dependency on trapped sphere radius, refractive index, and Gaussian beam waist size. In the single beam trap (SBT), the range of refractive indices which enable stable trapping depends strongly on the beam waist size (it grows with decreasing waist). On the contrary to the SBT, there are certain sphere sizes (non-trapping radii) that disable sphere confinement in standing wave trap (SWT) for arbitrary value of refractive index. For other sphere radii we show that the SWT enables confinement of high refractive index particle in wider laser beams and provides axial trap stiffness and maximal axial trapping force at least by two orders and one order bigger than in SBT, respectively. (C) 2003 Elsevier Science B.V. All rights reserved.

single beam trap, optical trapping, optical tweezers, standing wave, Mie scattering, Gaussian laser beam, FOCUSED LASER-BEAM, LORENZ-MIE THEORY, GAUSSIAN-BEAM, DIELECTRIC PARTICLES, MANIPULATION, FORCE, MICROPARTICLES, SCATTERING, TWEEZERS, FIELDS

15.05.2003

0030-4018

Optics Communications

220

4-6

12