title: Dual Airy beam.
abstract: We derive a general form of Airy wave function which satisfies paraxial equation of diffraction. Based on this, we propose a new form of Airy beam, which is composed of two symmetrical Airy beams which accelerate mutually in the opposite directions. This 'dual' Airy beam shows several distinguishing features: it has a symmetric transverse intensity pattern and improved self-regeneration property. In addition, we can easily control the propagation direction. We also propose 'quad' Airy beam, which forms a rectangular shaped optical array of narrow beams that travel along a straight line. We can control its propagation direction without changing transverse intensity patterns. These kinds of superposed optical beams are expected to be useful for various applications with their unique properties.
authors.affiliation: National Creative Research Center for Active Plasmonics Application Systems Inter-University Semiconductor Research Center and School of Electrical Engineering Seoul National University, Gwanak-Gu Gwanakro 599, Seoul 151-744, Korea.
authors.forename: Chi-Young
authors.initials: CY
authors.lastname: Hwang
authors.forename: Dawoon
authors.initials: D
authors.lastname: Choi
authors.forename: Kyoung-Youm
authors.initials: KY
authors.lastname: Kim
authors.forename: Byoungho
authors.initials: B
authors.lastname: Lee