Tunable-focus flat liquid-crystal diffractive lens

Pouria Valley, David L. Mathine, Mohammad Reza Dodge, James T Schwiegerling, Gholam Peyman, Nasser N Peyghambarian

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

We demonstrate an innovative variable-focus flat liquid-crystal diffractive lens (LCDL) with 95% diffraction efficiency and millisecond switching times using a ±2.4 V ac input. This lens is based on the electrical modulation of a 3μm layer of nematic liquid-crystal sandwiched between a Fresnel zone electrode structure and a reference substrate. Each zone is divided into 12 subzones to digitize the phase profiles and define the phase wrapping points. The focusing power can rapidly be switched by electrically changing the number of subzones and re-establishing the wrapping points. Potential applications include zooms with no moving parts and autofocus lenses for compact imaging devices.

Original languageEnglish (US)
Pages (from-to)336-338
Number of pages3
JournalOptics Letters
Volume35
Issue number3
DOIs
Publication statusPublished - Feb 1 2010

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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