title: Electrically switchable phase-type fractal zone plates and fractal photon sieves.
abstract: Electrically switchable phase-type fractal zone plates and fractal photon sieves were fabricated using polymer-dispersed liquid crystal material based on a photomask. While both exhibited similar first-order diffraction behavior, the fractal photon sieves showed greatly suppressed diffraction at higher orders. Compared with current amplitude-type photomasks, our switchable, phase-type devices demonstrated higher diffraction efficiency, an important factor in the future development of adaptive optics.
authors: Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors: Yan Jun
authors: YJ
authors: Liu
authors: Hai Tao
authors: HT
authors: Dai
authors: Xiao Wei
authors: XW
authors: Sun
authors: Tony Jun
authors: TJ
authors: Huang