Lenses made of Bragg-type gratings and used for integrated optics are fabricated by the technique of electron-beam pattern generation, chemical etching, and printing. They consist of straight lines of varying inclination and spacing. Focusing action is demonstrated experimentally.
© 1978 Optical Society of America
Gen-ichi Hatakoshi and Shun-ichi Tanaka, "Grating lenses for integrated optics," Opt. Lett. 2, 142-144 (1978)