Depth of focus in multilayered media-a long-neglected phenomenon aroused by immersion lithography

Burn-Jeng Lin

doi:10.1117/1.1637591

1 January 2004 Depth of focus in multilayered media-a long-neglected phenomenon aroused by immersion lithography

Burn-Jeng Lin

Author Affiliations +

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 3, Issue 1, (January 2004). https://doi.org/10.1117/1.1637591

Abstract

Depth of focus (DOF) is the gating factor of resolution and an indicator of the feasibility of a given technology node. However, its meaning is ambiguous. Sometimes it is used to indicate the longitudinal range of a good image governed by diffraction. Other times it is used as a budget for mechanical and optical tolerances. Another source of confusion is that the longitudinal range of a good diffracted image is usually evaluated for an air medium, ignoring the wavelength compression effect of the photoresist, as well as the fact that at least two media have to be within the longitudinal range of the good image. An immersion system with a high-index coupling medium makes the situation even more complicated. We classify the types of DOF into diffraction DOF, required DOF, and available DOF, then show the mutual dependence of these parameters and their significance in subwavelength imaging. The impact and DOF-resolution tradeoff, with and without a high-index coupling medium, is also explored.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Burn-Jeng Lin "Depth of focus in multilayered media-a long-neglected phenomenon aroused by immersion lithography," Journal of Micro/Nanolithography, MEMS, and MOEMS 3(1), (1 January 2004). https://doi.org/10.1117/1.1637591

Published: 1 January 2004

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