Abstract

Until now, several attempts have been made to obtain axicons by using liquid crystals. Previous results had always a considerable deviation from the linear response and the resulting aperture is square. In addition, classical fabrications methods are expensive and only produce fixed phase profiles. In this study, a novel structure to obtain tunable axicons with a perfect conical shape and a circular aperture is proposed and theoretically studied. The proposed optical device is based on nematic liquid crystal and phase shifted electrical signals. A simulation program consisted of Finite Elements Method to solve the voltage distribution combined with the Frank-Oseen equation to solve the molecular position of the nematic liquid crystal is employed. This device is totally reconfigurable by using low voltage signals. The focus depth and the position of this one can be controlled electrically.

Details

Title
Liquid Crystal Lensacons, Logarithmic and Linear Axicons
Author
Algorri, Jose Francisco; Urruchi, Virginia; García-Camara, Braulio; Sanchez-Pena, Jose Manuel
Pages
2593-2604
Publication year
2014
Publication date
2014
Publisher
MDPI AG
e-ISSN
19961944
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1530354201
Copyright
Copyright MDPI AG 2014