Circumferentially isotropic phase plate, method of making the sa

Details Circumferentially isotropic phase plate, method of making the sa Circumferentially isotropic phase plate, method of making the sa

1996-11-22

1998-12-08

Shafer, Ricky D.

Optical: systems and elements

Polarization without modulation

Depolarization

359483, 359900, 356365, 356367, G02B 530, G01J 400

Patent

active

058478728

ABSTRACT:
The circumferentially isotropic phase plate of the present invention includes (i) a plurality of first material layers which are formed by a first material on a transparent substrate and disposed in concentric circles around a predetermined axis within a plane orthogonal to an incident direction of a bundle of rays and (ii) a plurality of second material layers which are formed by a second material having a refractive index different from that of the first material and disposed in concentric circles around the predetermined axis so as to fill a space between the plurality of the first material layers, wherein the plurality of the first and second material layers are formed such that each layer thickness along the incident direction of the bundle of rays becomes uniform along a circumferential direction of the concentric circles, thereby constituting, as a whole, a form birefringent body which is isotropic in the circumferential direction of the concentric circles. Accordingly, the bundle of rays transmitted through this phase plate has a polarization distribution in which at least one of ellipticity and principal-axis azimuth continuously changes along the circumferential direction around the predetermined axis.

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Tae Jin Kim, et al. "Volume Holographic Phase-Retardation Elements", Optics Letters, vol. 20, No. 19, pp. 2030-2032, Oct. 1995.
Fang Xu, et al., "Fabrication, Modeling, and Characterization of Form-Birefringent Nanostructures", Optics Letters, vol. 20, No. 24, pp. 2457-2459, Dec. 1995.
Oyo Butaurl Kogaku Sensho (Applied Physical Engineering Selection) :2 Oyo Kogaku (Applied Optical) II, Tokyo: Balfukan, 1990, pp. 192-195.
M. Born and E. Wolf, Principles of Optics, 3rd edition, pp. 705-708, Jan. 1950, Pergamon Press, London.

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