Development of subwavelength structure coating (SWC) and its application to imaging lenses

Takeharu Okuno

doi:10.1117/12.868985

1 September 2010 Development of subwavelength structure coating (SWC) and its application to imaging lenses

Takeharu Okuno

Proceedings Volume 7652, International Optical Design Conference 2010; 765203 (2010) https://doi.org/10.1117/12.868985
Event: International Optical Design Conference 2010, 2010, Jackson Hole, WY, United States

Abstract

Canon Inc. released the new EF 24mm f/1.4L II USM lens with a subwavelength structure coating (SWC), a new type of high performance anti-reflective coating, in December 2008. The subwavelength structure, which is made from microcrystalline alumina, can be formed on large, curved surfaces using a simple sol-gel process. Furthermore, by inserting a thin-film layer with an intermediate refractive index between the lens and the microcrystalline alumina, it is possible to achieve superior anti-reflection performance matching various lens refractive indexes. This report presents the principles and performance of SWC and describes the application of SWC to imaging lenses.

Citation Download Citation

Takeharu Okuno "Development of subwavelength structure coating (SWC) and its application to imaging lenses", Proc. SPIE 7652, International Optical Design Conference 2010, 765203 (1 September 2010); https://doi.org/10.1117/12.868985

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