Phase-shifting masks with sub-wavelength diffractive optical elements
US8122388B2 · kind B2 · utility
2Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2008 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Apr 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/705
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention discloses a method of designing a set of two tiled masks, as well as, a mask including: a first tile, the first tile being transparent to a light, the first tile having a first characteristic linear dimension that is 15% or less of a wavelength of the light; a second tile, the second tile being transparent to the light, the second tile having a second characteristic linear dimension that is 15% or less of the wavelength of the light; and a third tile, the third tile being opaque to the light, the third tile having a third characteristic linear dimension that is 15% or less of the wavelength of the light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.