Negative Refraction in Photonic Crystals
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.
Pietro VINCENZINI and Giancarlo RIGHINI
T. Baba et al., "Negative Refraction in Photonic Crystals", Advances in Science and Technology, Vol. 55, pp. 91-100, 2008