Abstract
A novel liquid crystal microlens array with tunable multifocal capability, high optical power and fill-factor is proposed and experimentally demonstrated. A specific hole pattern design produces a multifocal array with only one voltage control. Three operations modes are possible, “Off”, “Tunable Multifocal” and “Unifocal”. The design is patterned in both substrates. Then, the substrates are arranged in symmetrical configuration. The result is a high optical power in comparison with typical hole patterned structures. Besides, it is proposed a hexagonal pattern that produces a high fill factor, specially indicated for some applications as Integral Imaging. The array has several useful characteristics for this type of application: tunability for the loss of resolution; multifocal for extended DOF; high fill factor for increase the number of views; and low power consumption for integration in portable devices. Moreover, the optical characteristics of the proposed device could bring new applications in other fields.
Highlights
Research on liquid crystal (LC) lenses has gained an increasing interest in recent years
In31 LC microlenses were proposed in order to increase the viewing angle or field of view (FOV)
The tunability is based on the properties of LC materials
Summary
José Francisco Algorri[1], Noureddine Bennis[2], Virginia Urruchi[1], Przemek Morawiak[2], José Manuel Sánchez-Pena1 & Leszek R. A novel liquid crystal microlens array with tunable multifocal capability, high optical power and fill-factor is proposed and experimentally demonstrated. The optical characteristics of the proposed device could bring new applications in other fields. Three operations modes are possible, OFF, tunable multifocal and unifocal These modes can be controlled with only one low voltage signal. The array has several useful characteristics for this type of application: tunability for the loss of resolution; multifocal for extended DOF; high fill factor for increase the number of views; and low power consumption for integration in portable devices. The optical characteristics of this device could bring new applications in other fields
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