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Three-dimensional light trap for reflective particles

Patent ·
OSTI ID:872458
 [1]
  1. Tijeras, NM
+ Show Author Affiliations
A system for containing either a reflective particle or a particle having an index of refraction lower than that of the surrounding media in a three-dimensional light cage. A light beam from a single source illuminates an optics system and generates a set of at least three discrete focussed beams that emanate from a single exit aperture and focus on to a focal plane located close to the particle. The set of focal spots defines a ring that surrounds the particle. The set of focussed beams creates a "light cage" and circumscribes a zone of no light within which the particle lies. The surrounding beams apply constraining forces (created by radiation pressure) to the particle, thereby containing it in a three-dimensional force field trap. A diffractive element, such as an aperture multiplexed lens, or either a Dammann grating or phase element in combination with a focusing lens, may be used to generate the beams. A zoom lens may be used to adjust the size of the light cage, permitting particles of various sizes to be captured and contained.
Research Organization:
SANDIA CORP
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
US 5939716
OSTI ID:
872458
Country of Publication:
United States
Language:
English

References (6)

Multitiered wavefront sensor using binary optics
  • Neal, Daniel R.; Warren, Mial E.; Gruetzner, James K.
  • 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, SPIE Proceedings https://doi.org/10.1117/12.176045
conference May 1994
Optical trapping of metallic Rayleigh particles journal January 1994
The TEM∗01 mode laser beam—A powerful tool for optical levitation of various types of spheres journal September 1978
Optical trapping and manipulation of single cells using infrared laser beams journal December 1987
Optical trapping and manipulation of viruses and bacteria journal March 1987
Acceleration and Trapping of Particles by Radiation Pressure journal January 1970

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