Optical concatenation of a large number of beads with a single-beam optical tweezer
Por:
Avila, Remy, Ascencio-Rodriguez, Joaquin, Tapia-Merino, Daniel, Rodriguez-Herrera, Oscar G., Gonzalez-Suarez, Arturo
Publicada:
1 abr 2017
Categoría:
Atomic and molecular physics, and optics
Resumen:
Optical tweezers consist of the spatial confinement of microscopic
dielectric particles by the action of forces produced by the change in
momentum of the photons of a highly focused laser beam that are deviated
by the particle. In experiments that use a single laser beam, it is
common to capture not only one but a few particles in the optical trap.
However, to our knowledge, the formation of a long chain of beads
optically confined with a single laser beam has never been reported. In
this work, up to 73 silica spheres immersed in water are seen
concatenated along the propagation direction of a 976-nm wavelength
Gaussian laser of 300 mW of power. This long chain of beads is obtained
when the laser is focused through an oil-immersion DIN microscope
objective with 100x magnification and a numerical aperture of 1.25. When
performing the same experiment using an infinity-corrected UplanFLN 100x
objective with a numerical aperture of 1.3, the maximum number of
concatenated beads is only 14. Our results suggest that the mechanisms
responsible for the observed phenomena involve successive refocusing of
the laser beam by each trapped sphere, optically induced dipole coupling
(commonly referred to as optical binding), and aberrations generated by
the DIN microscope objective. (C) 2017 Optical Society of America
Filiaciones:
Avila, Remy:
Univ Nacl Autonoma Mexico, Ctr Fis Aplicada & Tecnol Avanzada, Campus Juriquilla,Apdo Postal 1-1010, Queretaro 76000, Mexico
Ascencio-Rodriguez, Joaquin:
Univ Nacl Autonoma Mexico, Ctr Fis Aplicada & Tecnol Avanzada, Campus Juriquilla,Apdo Postal 1-1010, Queretaro 76000, Mexico
Zona Univ, Univ Veracruzana, Fac Fis, Xalapa 91090, Veracruz, Mexico
Tapia-Merino, Daniel:
Univ Nacl Autonoma Mexico, Ctr Fis Aplicada & Tecnol Avanzada, Campus Juriquilla,Apdo Postal 1-1010, Queretaro 76000, Mexico
Rodriguez-Herrera, Oscar G.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Aplicadas & Desarrollo Tecnol, Mexico City 04510, DF, Mexico
Gonzalez-Suarez, Arturo:
Univ Nacl Autonoma Mexico, Ctr Fis Aplicada & Tecnol Avanzada, Campus Juriquilla,Apdo Postal 1-1010, Queretaro 76000, Mexico
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