Submicrometer lithography by near-field optical microscopy

Saulius Juodkazis, Y. Arisawa, S. Matsuo, H. Misawa, R. Tomasiunas, J. Vaitkus

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Optimization of (i) intensity of illumination and (ii) thickness of resist was made looking for the conditions when high spatial resolution could be achieved by optical near-field lithography. Standard set-up of near-field illumination through a tapered Al-coated fiber tip was employed for the exposure of positive resist OFPR-5000(EG), which is photo-sensitive for wavelength λ < 450 nm. Tip was scanned along the line at near-field conditions of constant sample-to-tip separation to produce adjustable exposure dose of the spin-coated resist film. Femtosecond, 120 fs, pulses of the power P < 1 mW (at 82 MHz repetition rate) at 400 nm were coupled into a fiber (< 1 m length) and delivered to the surface of the resist for illumination.The issues of NSOM fabrication using tapered Al-coated tips are addressed. To achieve a reproducible and high aspect ratio (approaching 1: 1) NSOM-based lithography there should be found resists allowing to produce thin films (< 100 nm) with low surface roughness (< 10 nm).

Original languageEnglish
Pages (from-to)42-47
Number of pages6
JournalProceedings of SPIE-The International Society for Optical Engineering
Volume4318
DOIs
Publication statusPublished - 2001

Keywords

  • Al-coated silica tapered tips
  • Lithography
  • Near-field optical microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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