Optics: measuring and testing – By particle light scattering
Patent
1993-09-03
1994-11-08
Rosenberger, Richard A.
Optics: measuring and testing
By particle light scattering
250251, G01N 2147
Patent
active
053631900
ABSTRACT:
A microscopic specimen such as a cell organelle or a tissue cell generally has a non-rotational symmetrical refractive index distribution. Converging onto the microscopic specimen a laser beam with a non-rotational symmetrical intensity distribution (an elliptical pattern) traps the specimen, with the direction of the major axis of the specimen aligned with the direction of the major axis of the elliptical pattern of the laser beam. This is because the laser beam with the non-rotational symmetrical refractive index distribution has a non-rotational symmetrical trapping force, and hence can trap the specimen with non-rotational symmetrical refractive index distribution in a dynamically reliable manner. Thus, rotation of the major axis of the intensity distribution of the laser beam causes rotation of the trapped specimen.
REFERENCES:
patent: 3808550 (1974-04-01), Ashkin
patent: 4092535 (1978-05-01), Ashkin et al.
patent: 5170890 (1992-12-01), Wilson et al.
patent: 5198369 (1993-03-01), Itoh et al.
Ashkin et al "Observation of Light Scattering from Nonspherical Particles Using Optical Levitation", Applied Optics, vol. 19, No. 5, (1 Mar. 1980) pp. 660-668.
Inaba Humio
Kikuchi Susumu
Sato Shun'ichi
Olympus Optical Co,. Ltd.
Rosenberger Richard A.
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