Abstract
In this paper, we present the construction of a trifocal lens system by combining a liquid-crystal (LC) lens and an ordinary lens. The focusing properties of the proposed system can be controlled by changing the polarization state of the incident light wave. The characteristics of the fabricated lens system were evaluated and it was confirmed that the system converged light at three focal points. It was also confirmed that the intensity of the light collected at each focal point could be regulated by controlling the polarization state of incident light and the retardation of the LC Fresnel lens in the proposed trifocal lens system.
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