Adjustable hybrid diffractive/refractive achromatic lens

Pouria Valley, Nickolaos Savidis, Jim Schwiegerling, Mohammad Reza Dodge, Gholam Peyman, N. Peyghambarian

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We demonstrate a variable focal length achromatic lens that consists of a flat liquid crystal diffractive lens and a pressure-controlled fluidic refractive lens. The diffractive lens is composed of a flat binary Fresnel zone structure and a thin liquid crystal layer, producing high efficiency and millisecond switching times while applying a low ac voltage input. The focusing power of the diffractive lens is adjusted by electrically modifying the sub-zones and re-establishing phase wrapping points. The refractive lens includes a fluid chamber with a flat glass surface and an opposing elastic polydimethylsiloxane (PDMS) membrane surface. Inserting fluid volume through a pump system into the clear aperture region alters the membrane curvature and adjusts the refractive lens' focal position. Primary chromatic aberration is remarkably reduced through the coupling of the fluidic and diffractive lenses at selected focal lengths. Potential applications include miniature color imaging systems, medical and ophthalmic devices, or any design that utilizes variable focal length achromats.

Original languageEnglish (US)
Pages (from-to)7468-7479
Number of pages12
JournalOptics Express
Volume19
Issue number8
DOIs
StatePublished - Apr 11 2011

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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