title: Negative dispersion retarder using two negative birefringence films.
abstract: The achromatic response and wide viewing angle for varying wavelength of incident light are of long waiting research to be utilized it for the display devices. Such response can be obtained by employing the retarder that exhibits negative birefringence and negative dispersion. In this paper, negative dispersion half-wave retarder and negative dispersion quarter-wave retarder have been demonstrated by optimizing the retardation and the angle between the extraordinary axes of polystyrene and poly-methylmethacrylate films. The optimum angles for half and quarter-wave retarders were found to be 40° and 70°, respectively for different retardation values of polystyrene and poly-methylmethacrylate films.
authors.forename: Anoop Kumar
authors.initials: AK
authors.lastname: Srivastava
authors.forename: Seungbin
authors.initials: S
authors.lastname: Yang
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Lee