Optical element, polarization filter, optical isolator, and optical apparatus
An optical element transmits incident light having a particular polarization direction mainly by 0-order transmission and diffracts incident light having a perpendicular polarization direction. The optical element includes a periodic structure having a period equal to or greater than the wavelength...
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Main Authors | , , |
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Format | Patent |
Language | Chinese English |
Published |
11.04.2012
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Subjects | |
Online Access | Get full text |
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Summary: | An optical element transmits incident light having a particular polarization direction mainly by 0-order transmission and diffracts incident light having a perpendicular polarization direction. The optical element includes a periodic structure having a period equal to or greater than the wavelength of the incident light. The periodic structure includes first and second subwavelength concave-convex structures formed perpendicularly adjacent to each other in each period of the periodic structure. The first and the second subwavelength concave-convex structures have a period less than the wavelength of the incident light. A filling factor and a groove depth of the first and the second subwavelength concave-convex structures are determined such that they have the same effective refraction index with respect to the incident light having the particular polarization direction and a phase difference p with respect to the incident light having the particular polarization direction. |
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Bibliography: | Application Number: CN2010818508 |