Patent ID: 9484051
Filing Date: 2016-11-01
CPC Classification: G11B

Claim Text:
1. A heat assisted magnetic recording (HAMR) write apparatus coupled with a laser for providing energy, the HAMR write apparatus comprising: a pole for writing to a region of the media, the pole including a media-facing surface; at least one coil for energizing the pole; a waveguide optically coupled with the laser and including a core and cladding; a near-field transducer (NFT), the waveguide for directing a portion of the energy toward the NFT, the NFT located in a transmission direction from the core of the waveguide; and at least one antireflective mechanism residing in at least one of a first position in the waveguide, a second position in the NFT and a third position between the waveguide and the NFT; wherein the at least one antireflective mechanism has a location selected from the first position within the waveguide and the third position between the waveguide and the NFT; wherein the at least one antireflective mechanism includes a material having a thickness along the transmission direction selected to reduce reflections in a reflection direction opposite to the transmission direction, the material being selected from a high index material and a metal, the high index material having an index of refraction not less than a waveguide core index of refraction, the thickness of the metal being not more than one and one half multiplied by a metal skin depth.