Hermaphroditic liquid-crystal microlens.
We demonstrate a flat microlens that exhibits hermaphroditic focusing properties. When the input polarization is parallel (perpendicular) to the liquid-crystal directors, the lens exhibits a positive (negative) focal length. To select the proper polarization, we could rotate the polarizer (or the lens) mechanically or by use of an electrically controlled twisted nematic liquid-crystal cell. Details of the lens structure and of the device's fabrication and performance are described.
Ren
Hongwen
H
College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.
Wu
Janet R
JR
Fan
Yun-Hsing
YH
Lin
Yi-Hsin
YH
Wu
Shin-Tson
ST