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Updated: Jul 4, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Aberration reduction and unique light focusing in a photonic crystal negative refractive lens
Tomohiko Asatsuma1, Toshihiko Baba
1Yokohama National University, Department of Electrical and Computer Engineering 79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501, Japan.
Abstract:
Light focusing characteristics of a negative refractive lens fabricated out of a silicon-on-insulator photonic crystal (PC) slab are investigated theoretically and experimentally. It focuses in the near infrared, but the focal spot is degraded by a lens aberration. To reduce the aberration, we designed a composite PC that gives rise to a narrower focal spot. In addition, two unique functions of this lens are demonstrated: refocusing outside of the PC and parallel focusing, enabling image transfer and real image formation, respectively. These results prove the feasibility of an in-plane free space optical network based on negative refraction.

