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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17790–17798

Increased process latitude in absorbance-modulated lithography via a plasmonic reflector

Charles W. Holzwarth, John E. Foulkes, and Richard J. Blaikie  »View Author Affiliations

Optics Express, Vol. 19, Issue 18, pp. 17790-17798 (2011)

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Absorbance-modulated lithography is a relatively new optical patterning method where a thin layer of photochromic molecules is placed between the far-field optics and photoresist. These molecules can be made transparent or opaque by illuminating with wavelengths λ1 or λ2, respectively. By simultaneously illuminating this layer with patterns of both wavelengths it is possible to create an absorption mask capable of subwavelength resolution. This resolution comes at the price of limited contrast and depth-of-focus resulting in poor process latitude. Here it is shown that by using TM polarization for λ1 and integrating a plasmonic reflector process latitude is increased by up to 66%.

© 2011 OSA

OCIS Codes
(110.5220) Imaging systems : Photolithography
(160.4330) Materials : Nonlinear optical materials
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Imaging Systems

Original Manuscript: July 11, 2011
Revised Manuscript: August 7, 2011
Manuscript Accepted: August 8, 2011
Published: August 25, 2011

Charles W. Holzwarth, John E. Foulkes, and Richard J. Blaikie, "Increased process latitude in absorbance-modulated lithography via a plasmonic reflector," Opt. Express 19, 17790-17798 (2011)

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