skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Three-dimensional light trap for reflective particles

Abstract

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.

Inventors:
 [1]
  1. (Tijeras, NM)
Issue Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
872458
Patent Number(s):
5939716
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
three-dimensional; light; trap; reflective; particles; containing; particle; index; refraction; surrounding; media; cage; beam; single; source; illuminates; optics; generates; set; discrete; focussed; beams; emanate; exit; aperture; focus; focal; plane; located; close; spots; defines; surrounds; creates; circumscribes; zone; lies; apply; constraining; forces; created; radiation; pressure; force; field; diffractive; element; multiplexed; lens; dammann; grating; phase; combination; focusing; generate; zoom; adjust; size; permitting; various; sizes; captured; contained; various sizes; phase element; single source; focusing lens; light beam; focal plane; focal spot; diffractive element; exit aperture; active element; source illuminates; radiation pressure; three-dimensional light; focal spots; reflective particle; /250/

Citation Formats

Neal, Daniel R. Three-dimensional light trap for reflective particles. United States: N. p., 1999. Web.
Neal, Daniel R. Three-dimensional light trap for reflective particles. United States.
Neal, Daniel R. Fri . "Three-dimensional light trap for reflective particles". United States. https://www.osti.gov/servlets/purl/872458.
@article{osti_872458,
title = {Three-dimensional light trap for reflective particles},
author = {Neal, Daniel R.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

Patent:

Save / Share: