Invention Grant
- Patent Title: Sub-resolutional grayscale reticle
- Patent Title (中): 子分辨灰度光罩
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Application No.: US12193568Application Date: 2008-08-18
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Publication No.: US07887980B2Publication Date: 2011-02-15
- Inventor: Bruce D. Ulrich , Yoshi Ono , Wei Gao
- Applicant: Bruce D. Ulrich , Yoshi Ono , Wei Gao
- Applicant Address: US WA Camas
- Assignee: Sharp Laboratories of America, Inc.
- Current Assignee: Sharp Laboratories of America, Inc.
- Current Assignee Address: US WA Camas
- Agency: Law Office of Gerald Maliszewski
- Agent Gerald Maliszewski
- Main IPC: G03F1/00
- IPC: G03F1/00 ; G03F7/00

Abstract:
A sub-resolutional grayscale reticle and associated fabrication method have been presented. The method provides a transparent substrate, and forms a plurality of coincident partial-light transmissive layers overlying the transparent substrate. A pattern is formed, sub-resolutional at a first wavelength, in at least one of the transmissive layers. If there are n transmissive layers, the reticle transmits at least (n+1) intensities of light. In one aspect, each of the plurality of transmissive layers has the same extinction coefficient and the same thickness. In other aspects, the transmissive layers may have different thickness. Then, even if the extinction coefficients are the same, the attenuation of light through each layer is different. The transmission characteristics of the reticle can be further varied if the transmissive layers have different extinction coefficients. Likewise, the transmission characteristics through the sub-resolutional patterns can be varied.
Public/Granted literature
- US20100040958A1 Sub-Resolutional Grayscale Reticle Public/Granted day:2010-02-18
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