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Switchable Fresnel zone lenses for optical interconnections

: Ferstl, M.; Frisch, A.-M.

Motamedi, M.E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Microelectronic structures and MEMS for optical processing II : 14-15 October 1996, Austin, Texas
Bellingham/Wash.: SPIE, 1996 (SPIE Proceedings Series 2881)
ISBN: 0-8194-2279-7
Conference "Microelectronic Structures and MEMS for Optical Processing" <2, 1996, Austin/Tex.>
Fraunhofer HHI ()
computer-generated holography; electro-optical switches; fresnel diffraction; lenses; light diffraction; liquid crystal devices; micromachining; micromechanical devices; optical fabrication; optical focusing; optical glass; optical interconnections; quartz; switching; zone plates; switchable fresnel zone lenses; on-axis fresnel zone lenses; off-axis fresnel zone lenses; focal length; aperture; quartz glass; microstructuring techniques; kinoform profile; diffractive optical elements; staircase-like profile; discrete phase levels; electrically switchable lenses; liquid crystal-filled structured surface; ac voltage; focusing lens state; transparent glass-plate state; optical properties; switching behaviour

Various on-axis and off-axis Fresnel zone lenses with different focal lengths and apertures were fabricated in quartz glass by means of microstructuring techniques. The kinoform profile of the diffractive optical elements was approximated by a staircase-like profile with a number of discrete phase levels. Dynamic, i.e. electrically switchable, lenses have been realized by filling the structured surface with liquid crystal. By applying an AC voltage, the elements can be switched from the state of a "focusing lens" to that of a "transparent glass-plate". The optical properties of the lenses and the switching behaviour were studied. Experimental measurements are compared with theoretical results.