Abstract

An optical head employing a concentric-circular grating coupler (CGC) and a concentric-circular focusing grating coupler (CFGC) is proposed, and its operating principle and characteristics are reported. Satisfaction with a prerequisite for the head, i.e., the removal of aberrations caused by deviations in wavelength and the effective index, is theoretically achieved by application of the concept of optimization of an annular aperture. With CGC and CFGC fabricated by an electron-beam-writing method, we experimentally confirmed its fundamental characteristics of light input, waveguiding, output, and convergence, with an elliptical focusing spot converging at half-intensity widths of 1.8 and 4.0 μm.

© 1994 Optical Society of America

Aberrations and convergence characteristics of a concentric-circular focusing grating coupler: analysis

Seiji Nishiwaki
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Fabrication of a concentric-circular focusing grating coupler by a conic-wave-front interference method and light-convergence experiments using the coupler

Seiji Nishiwaki, Jun-ichi Asada, Kiyoko Ohshima, and Tetsuo Kitagawa
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Fabrication of aberration-free focusing grating couplers

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Aberration characterizations of a focusing grating coupler in an integrated-optic disk pickup device

Shogo Ura, Toshiaki Suhara, and Hiroshi Nishihara
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