Wavelength and Focal Length Tunable Reflective Fresnel Lenses Using Liquid Crystal Spatial Light Modulators

Chi-Tang Huang^1*, Sheng-Le Wang¹, Tsung-Yi Hou¹, Cheng-Kai Liu¹, Ko-Ting Cheng¹

¹Department of Optics and Photonics, National Central University, Taoyuan, Taiwan

* Presenter:Chi-Tang Huang, email:h84515@gmail.com

We demonstrated electrically switchable wavelength and focal length tunable reflective Fresnel lenses using reflective liquid crystal spatial light modulator (RLC-SLM). The experimentally obtained maximum diffraction efficiencies of ~38%, close to the theoretical limit value of ~40.5%. On the basis of the real time switches of Fresnel Zone Plates (FZP), the desired color light focusing based on color sequential and additive color techniques can be realized.

Keywords: Liquid Crystal, Spatial Light Modulator, Fresnel Zone Plate, Color Sequential Technology