title: A photonic-crystal optical antenna for extremely large local-field enhancement.
abstract: We propose a novel design of an all-dielectric optical antenna based on photonic-band-gap confinement. Specifically, we have engineered the photonic-crystal dipole mode to have broad spectral response (Q~70) and well-directed vertical-radiation by introducing a plane mirror below the cavity. Considerably large local electric-field intensity enhancement~4,500 is expected from the proposed design for a normally incident planewave. Furthermore, an analytic model developed based on coupled-mode theory predicts that the electric-field intensity enhancement can easily be over 100,000 by employing reasonably high-Q (~10,000) resonators.
authors.affiliation: Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Hyun-Joo
authors.initials: HJ
authors.lastname: Chang
authors.forename: Se-Heon
authors.initials: SH
authors.lastname: Kim
authors.forename: Yong-Hee
authors.initials: YH
authors.lastname: Lee
authors.forename: Emil P
authors.initials: EP
authors.lastname: Kartalov
authors.forename: Axel
authors.initials: A
authors.lastname: Scherer