Mutual optimization of resolution enhancement techniques

Bruce W. Smith

doi:10.1117/1.1450596

1 July 2002 Mutual optimization of resolution enhancement techniques

Bruce W. Smith

Author Affiliations +

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 1, Issue 2, (July 2002). https://doi.org/10.1117/1.1450596

Abstract

As subhalf wavelength optical lithography is pursued, the variety of imaging requirements increases. This can result in complex combinations of various resolution enhancement techniques. Optimization based on simple standards or rules is not possible. Problems often arise as analysis is carried out in a spatial domain, where mask and image properties are evaluated using sizing or dimensional evaluations. A more appropriate perspective for image optimization is that of the lens pupil, in a spatial frequency domain. In this paper, we describe the common characteristics of resolution enhancement, beyond the historical comparisons of alternating phase shifting masking (PSM) and strong OAI. Enhancement techniques including assist feature optical proximity correction (OPC), custom illumination, attenuated PSM, and pupil filtering are described from a spatial frequency standpoint where each can be utilized to take advantage of strengths and avoid weaknesses. As a result of this type of analysis, we will also describe an alternative OPC method in which assist features of varying tone, referred to as gray bars, provide significant image improvement.

©(2002) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Bruce W. Smith "Mutual optimization of resolution enhancement techniques," Journal of Micro/Nanolithography, MEMS, and MOEMS 1(2), (1 July 2002). https://doi.org/10.1117/1.1450596

Published: 1 July 2002

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE