Method for compensating for phase variations in an interferometric tapered waveguide in a heat assisted magnetic recording head
US9286920B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2013 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Feb 3, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method fabricates an interferometric tapered waveguide (ITWG) for a heat-assisted magnetic recording (HAMR) transducer. The ITWG is defined from at least one waveguide layer. The waveguide layer(s) include an energy sensitive core layer. The energy sensitive core layer has an index of refraction that varies in response to exposure to energy having a particular wavelength range. The step of defining the ITWG includes defining a plurality of arms for the ITWG. At least one phase difference between the arms is determined. At least one of the arms is exposed to the energy such that the index of refraction of the energy sensitive core layer in the arm(s) is changed and such that the phase difference(s) between the arms is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.