@article{oai:ynu.repo.nii.ac.jp:00004094,
 author = {Asatsuma, Tomohiko and Baba, Toshihiko},
 issue = {12},
 journal = {Optics express},
 month = {Jun},
 note = {application/pdf, 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.},
 pages = {8711--8719},
 title = {Aberration reduction and unique light focusing in a photonic crystal negative refractive lens},
 volume = {16},
 year = {2008}
}