Abstract
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 language | English (US) |
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Pages (from-to) | 28-33 |
Number of pages | 6 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5380 |
DOIs | |
State | Published - 2004 |
Event | Optical Data Storage 2004 - Monterey, CA, United States Duration: Apr 18 2004 → Apr 21 2004 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering