Optical element having periodic structure and optical...

Optical: systems and elements – Polarization without modulation – Polarization by reflection or refraction

Reexamination Certificate

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C359S489060, C359S489070

Reexamination Certificate

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08009355

ABSTRACT:
An optical element includes a first periodic structure portion being formed on a base portion and having a one-dimensional periodic structure in which a first medium and a second medium with a smaller refractive index than that of the first medium are alternately disposed in a first direction, and a second periodic structure portion being formed on the first periodic structure portion and having a periodic structure in which a third medium and a fourth medium with a smaller refractive index than that of the third medium are alternately disposed in the first direction. At an interface between the first and second periodic structure portions, a ratio of the first medium in the first periodic structure portion and a ratio of the third medium in the second periodic structure portion are different from each other. The element has a good form birefringence effect and a high reflection-suppressing effect.

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M. Born et al., Principles of Optics, 6th Edition, 1980, pp. 705-708, Pargamon Press.
H. Kikuta et al, Achromatic quarter-wave plates using the dispersion of form birefringence, Applied Optics., Mar. 1, 1997, pp. 1566-1572, vol. 36, No. 7, Optical Society of America.

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