title: Fabrication of an optical lens array using ultraviolet light and ultrasonication.
abstract: A technique to form an optical lens array using an ultraviolet (UV)-curable resin and ultrasound was investigated. A UV-curable gel film was formed on a glass plate having four lead zirconate titanate (PZT) transducers. Excitation of the transducers generated a lattice flexural vibration mode on the glass plate. The acoustic radiation force acted to deform the surface of the gel film, so that a lens array could be fabricated on the gel film. The lens array was exposed to UV light under ultrasonication to cure the UV-curable film. The quality factor of the transducer resonance was decreased upon curing of the resin film because the cured resin dampened the vibration of the plate. The acoustic characteristics of the UV-curable gel film were measured by using an ultrasound pulse technique at the MHz range. The sound speed of the gel increased from 987 to 1006 m/s (increase of 1.9%) as the UV exposure time increased. The attenuation coefficient also increased and the larger attenuation of the resin caused the lens array to have a lower quality factor.
authors.affiliation: Faculty of Life and Medical Sciences, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan; Wave Electronics Research Center, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan.
authors.forename: Satoki
authors.initials: S
authors.lastname: Taniguchi
authors.affiliation: Faculty of Science and Engineering, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan; Wave Electronics Research Center, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan. Electronic address: dkoyama@mail.doshisha.ac.jp.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Koyama
authors.affiliation: Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: Faculty of Science and Engineering, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan; Wave Electronics Research Center, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe, Kyoto 610-0321, Japan.
authors.forename: Mami
authors.initials: M
authors.lastname: Matsukawa
mesh_terms: D000162:Acoustics; D005782:Gels; D014159:Transducers; D014465:Ultrasonics; D014466:Ultraviolet Rays
chemical_list: D005782:Gels
keywords: Acoustic radiation force; Flexural vibration; Lens array; Ultraviolet-curable resin