title: Extreme stiffness hyperbolic elastic metamaterial for total transmission subwavelength imaging.
abstract: Subwavelength imaging by metamaterials and extended work to pursue total transmission has been successfully demonstrated with electromagnetic and acoustic waves very recently. However, no elastic counterpart has been reported because earlier attempts suffer from considerable loss. Here, for the first time, we realize an elastic hyperbolic metamaterial lens and experimentally show total transmission subwavelength imaging with measured wave field inside the metamaterial lens. The main idea is to compensate for the decreased impedance in the perforated elastic metamaterial by utilizing extreme stiffness, which has not been independently actualized in a continuum elastic medium so far. The fabricated elastic lens is capable of directly transferring subwavelength information from the input to the output boundary. In the experiment, this intriguing phenomenon is confirmed by scanning the elastic structures inside the lens with laser scanning vibrometer. The proposed elastic metamaterial lens will bring forth significant guidelines for ultrasonic imaging techniques.
authors.affiliation: WCU Multiscale Design Division, School of Mechanical and Aerospace Engineering,Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Hyuk
authors.initials: H
authors.lastname: Lee
authors.affiliation: Institute of Advanced Machines and Design, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Joo Hwan
authors.initials: JH
authors.lastname: Oh
authors.affiliation: Center for Safety Measurement, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu,Daejon 305-340, Korea.
authors.forename: Hong Min
authors.initials: HM
authors.lastname: Seung
authors.affiliation: Center for Safety Measurement, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu,Daejon 305-340, Korea.
authors.forename: Seung Hyun
authors.initials: SH
authors.lastname: Cho
authors.affiliation: WCU Multiscale Design Division, School of Mechanical and Aerospace Engineering,Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.|Institute of Advanced Machines and Design, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Yoon Young
authors.initials: YY
authors.lastname: Kim