Aspherical liquid crystal lenses based on a variable transmission electrode

Author:

Bennis N.1,Jankowski T.2,Morawiak P.1,Spadlo A.1,Zografopoulos D. C.ORCID,Sánchez-Pena J. M.3,López-Higuera J. M.456ORCID,Algorri J. F.456ORCID

Affiliation:

1. Military University of Technology

2. Warsaw University of Technology

3. Carlos III University

4. University of Cantabria

5. Instituto de Salud Carlos III

6. Instituto de Investigación Sanitaria Valdecilla (IDIVAL)

Abstract

In this work, a technique to generate aspherical liquid crystal lenses with positive and negative optical power is experimentally demonstrated. The main enabling element is a micro-metric electrode with variable spatial size. This produces a decreasing resistance towards the lens centre that generates the desired voltage/phase profiles. Then, the voltage is homogeneously distributed across the active area of the lens by micro-metric concentric electrodes. As it is demonstrated, the phase shift can be controlled with voltages from 0 to 4.5 VRMS. As a result, parabolic profiles are obtained both for negative and positive optical powers. Furthermore, this approach avoids some disadvantages of previous techniques; parabolic profiles can be obtained with only one lithographic step and one or two voltage sources. Other complex aspherical profiles could be fabricated using the same technique, such as elliptical or hyperbolic ones.

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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