Subwavelength-resolvable focused non-Gaussian beam shaped with a binary diffractive optical element

Michael R. Wang, Xu Guang Huang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The diffraction-limited spot size limits the optical disk storage capacity and microscopic resolution. We describe a technique to shape a focused Gaussian beam into a superresolving beam by using a diffractive optical element fabricated by laser-assisted chemical etching. The focused shaped beam has a smaller width and a longer depth of focus than a similarly focused Gaussian beam. Using the diffraction-limited shaped beam along with threshold writing, we achieved a written pit size of less than 0.33 μm at a 695-nm laser wavelength, compared with a 0.7-μm focused Gaussian spot size (full width at e-2 of the peak) with the same focusing lens. The energy conversion efficiency for the beam shaping was ∼81%.

Original languageEnglish (US)
Pages (from-to)2171-2176
Number of pages6
JournalApplied Optics
Issue number11
StatePublished - Apr 10 1999

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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