Ferstl, M.M.FerstlFrisch, A.-M.A.-M.Frisch2022-03-092022-03-091996https://publica.fraunhofer.de/handle/publica/327377Various 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.encomputer-generated holographyelectro-optical switchesfresnel diffractionlenseslight diffractionliquid crystal devicesmicromachiningmicromechanical devicesoptical fabricationoptical focusingoptical glassoptical interconnectionsquartzswitchingzone platesswitchable fresnel zone lenseson-axis fresnel zone lensesoff-axis fresnel zone lensesfocal lengthaperturequartz glassmicrostructuring techniqueskinoform profilediffractive optical elementsstaircase-like profilediscrete phase levelselectrically switchable lensesliquid crystal-filled structured surfaceac voltagefocusing lens statetransparent glass-plate stateoptical propertiesswitching behaviour621conference paper