Patent ID: 9291560
Filing Date: 2016-03-22
CPC Classification: G01N,G11B

Claim Text:
1. A system comprising: a near field transducer (NFT) subassembly including an input coupler proximate a first surface and an NFT optical antenna proximate a second surface; an excitation light source configured to provide excitation radiation to the near field transducer subassembly; an optical filter configured to substantially pass a portion of photoluminescent radiation emitted by the NFT optical antenna in response to the excitation radiation and to substantially block the excitation radiation; a detector configured to detect the portion of photoluminescent radiation and to output an output signal in response to detection of the portion of photoluminescent radiation; a focusing lens configured to focus the excitation radiation onto the input coupler of the NFT subassembly; and an objective lens configured to collect photoluminescent radiation emitted by the NFT toward the optical filter.