Design of an integrated gradient-index light condenser for the light delivery in a heat-assisted magnetic recording head

Kun Tang*, Qian Wang, Gurpreet Singh, Seng Tiong Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this paper, the authors have designed a light condenser device based on the integrated gradient-index (GRIN) lens for the light delivery in a heat-assisted magnetic recording head. The function of the GRIN light condenser is to solve the mode size mismatch and to realize a smooth and efficient light condensation between an external laser diode and a nano-waveguide. Two realizable approaches based on the alloying and two-material film stack to actualize the equivalent index profile have been discussed. From the numerical examples, optimized coupling efficiencies of 93.2% and 86.0% can be achieved for the case of transverse electric and transverse magnetic polarized light, respectively.

Original languageEnglish (US)
Article number6650078
JournalIEEE Transactions on Magnetics
Volume50
Issue number4
DOIs
StatePublished - Apr 2014

Keywords

  • Gradient refractive index
  • Heat-assisted magnetic recording
  • Light condenser
  • Light delivery system
  • coupling Efficiency

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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