We have devised an optical high-throughput nanosized beam-generating structure consisting of butted gratings with small numbers of periods. We analyzed the structure of these grating by the transverse resonance method. We then demonstrated that it is possible to achieve a beam spot of 45 nm × 60 nm (FWHM) with this structure for the optical heads used in ultrahigh-density recording, such as those used in laser-assisted magnetic recording storage.
© 2004 Optical Society of America
(210.0210) Optical data storage : Optical data storage
(210.3810) Optical data storage : Magneto-optic systems
(230.0230) Optical devices : Optical devices
(230.1950) Optical devices : Diffraction gratings
Shin-ya Hasegawa and Fumihiro Tawa, "Generation of Nanosized Optical Beams by Use of Butted Gratings with Small Numbers of Periods," Appl. Opt. 43, 3085-3096 (2004)