Yun-Hsing Fan | PubMed Health

PubMed2005

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.

Journal Article↗

PubMed2004

Liquid-crystal microlens arrays using patterned polymer networks.

A real-time dynamically tunable-focus microlens array made from a polymer-liquid-crystal (LC) composite is demonstrated. The polymer was first patterned in microlens array cavities by lamination, and the LC-monomer mixture was then injected to the molded polymer cavities and finally stabilized by UV light-induced networks. Using this new fabrication method, we demonstrated a lens with a spherical shape and a glazed surface. This LC-based microlens can reach approximately 100% light efficiency for linearly polarized light. The saturation voltage of the lens is approximately 60 Vrms, and the response time is approximately 30 ms.

Journal Article↗