title: Multiple Bragg diffraction in polymeric photonic crystals.
abstract: A systematic study of the angle-resolved photonic stop band of three-dimensionally (3D) ordered polymeric photonic crystals fabricated using a colloidal self-assembling method is presented. The first-order photonic stop band shows a single peak in reflection and shifts toward shorter wavelengths for larger angles of incidence. Beyond an angle of incidence of 45 degrees , a new peak arises in the reflection spectrum due to the coupling of the incident light into other directions of the fcc Brillouin zone. The predominant contribution is identified as being due to reflection from the (200) plane.
authors.affiliation: Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India.
authors.forename: Rajesh V
authors.initials: RV
authors.lastname: Nair
authors.forename: R
authors.initials: R
authors.lastname: Vijaya