New waveguide grating lenses for coupling a guided wave to a spherical wave, focusing in the air, have been designed. The lenses have the advantages of high efficiency and high practicability for fabrication. Chirped and curved grating lenses were fabricated on PMMA waveguides by an electron beam exposure system.
© 1984 Optical Society of America
Gen-ichi Hatakoshi, Harumi Fujima, and Kenya Goto, "Waveguide grating lenses for optical couplers," Appl. Opt. 23, 1749-1753 (1984)