Waveguide, recording head, and recording device

摘要

Incident light can be efficiently converted into near-field light whose spot size is small. A waveguide 10 includes: a metallic member 11 made of a metallic material; and a dielectric member 12 made of a dielectric material. The metallic member 11 includes a first interface 16 and a second interface 18 so as to sandwich the dielectric member 12. The first interface and the second interface are provided so that an inter-interface distance therebetween may decrease from ends 16c and 18c to ends 16d and 18d. The first interface 16 and the second interface 18 have flections P16 and P18, respectively.