Prototype mode index lens for heat assisted magnetic recording

L. Zhou, J. A. Bain, T. E. Schlesinger, M. Lang, T. D. Muster

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Mode index lenses for light delivery intended for use as part of a heat-assisted magnetic recording head were designed and tested. The waveguides in which these lenses were constructed consisted of a Si 3N 4 guiding layer on top of a SiO 2 cladding layer with thickness of 1 μm. The top confining layer of the waveguide was air. Mode index lenses were created by using Si 3N 4 regions of two different thicknesses (350 nm and 140 nm), having mode indices of 1.925 and 1.745, respectively. A scanned optical fiber was used to profile light scattered out of the waveguide. The measured spot size is 2.2 μm at the exit of the final lens in a three-lens sequence, which is an upper bound on the actual spot size with this resolution set by limitations of the measurement system.

Original languageEnglish (US)
Pages (from-to)28-33
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventOptical Data Storage 2004 - Monterey, CA, United States
Duration: Apr 18 2004Apr 21 2004

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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