title: Extraordinary transmittance in three dimensional crater, pyramid, and hole-array structures prepared through reversal imprinting of metal films.
abstract: We used a reversal imprinting-in-metal (RIM) process to fabricate various three-dimensional (3D) metal structures under low pressure. Molds featuring different shapes were used to pattern various subwavelength metal structures, including pyramidal, hole-array, and crater-like structures. Refractive index matching and cavity effects both enhanced the degree of transmission of these structured metal films. The crater-like structure appears to be a promising material because of the unique properties imparted by the elongated and gradually tapering spacing of its cavities. From both near-field simulations and experimentally obtained optical spectra, we found that the cavity effect in the crater-like structure led to significantly enhanced transmission of the optical intensity. Thus, this RIM process allows the ready fabrication of various two- and three-dimensional metallic structures for use in surface plasmon-based devices.
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan. hsuenlichen@ntu.edu.tw
authors.forename: H L
authors.initials: HL
authors.lastname: Chen
authors.forename: S Y
authors.initials: SY
authors.lastname: Chuang
authors.forename: W H
authors.initials: WH
authors.lastname: Lee
authors.forename: S S
authors.initials: SS
authors.lastname: Kuo
authors.forename: W F
authors.initials: WF
authors.lastname: Su
authors.forename: S L
authors.initials: SL
authors.lastname: Ku
authors.forename: Y F
authors.initials: YF
authors.lastname: Chou