Back to results
US 2011/0255390 A1Published application
Optical element, optical apparatus, optical pickup, optical information processing apparatus, optical attenuator, polarization conversion element, projector optical system, and optical apparatus system
AssigneeRicoh Company, Ltd.
InventorHideaki Hirai
Life of this patent
Estimating the term…
Abstract
A disclosed optical element includes three or more sub-wavelength convexo-concave structures having pitches less than a wavelength of an incident light incident to the optical element and having groove depths equal to each other and a periodic structure having the three or more sub-wavelength convexo-concave structures, the pitch of the periodic structure greater than the wavelength of the incident light, in which a predetermined polarization direction of the incident light is diffracted mainly into a specific order.
Claims12
An optical element comprising:
- three or more sub-wavelength convexo-concave structures having pitches less than a wavelength of an incident light incident to the optical element and having groove depths equal to each other;
- and
- a periodic structure having the three or more sub-wavelength convexo-concave structures, the pitch of the periodic structure greater than the wavelength of the incident light, wherein
- a predetermined polarization direction of the incident light is diffracted mainly into a specific order.
1 more element
Dependencies are inferred from the claim text.