Aberration reduction and unique light focusing in a photonic crystal negative refractive lens.
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.
Yokohama National University, Department of Electrical and Computer Engineering 79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501, Japan.
Tomohiko
T
Asatsuma
Toshihiko
T
Baba
D016477:Artifacts; D003198:Computer Simulation; D003461:Crystallography / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D017785:Photons; D012031:Refractometry; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*
D012825:Silicon