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Modal liquid crystal microaxicon array.

José Francisco Algorri, Virginia Urruchi, Noureddine Bennis

|July 1, 2014

Summary

A new tunable liquid crystal microaxicon array offers reconfigurable, low-voltage control over Bessel beams. This innovation enables precise adjustments to beam diameter and phase, paving the way for advanced optical applications.

Area of Science:

Optics and Photonics
Micro-optics
Liquid Crystal Devices

Background:

Microaxicon arrays are crucial for generating Bessel beams, which have applications in optical trapping and microscopy.
Existing microaxicon technologies often lack tunability, reconfigurability, or are complex and costly to fabricate.

Purpose of the Study:

To propose and experimentally demonstrate a novel tunable liquid crystal microaxicon array.
To achieve simple, low-voltage, and reconfigurable control over microaxicon parameters and Bessel beam characteristics.

Main Methods:

Fabrication of a microaxicon array using liquid crystal technology.
Application of four control voltages to independently tune the array's optical properties.
Experimental characterization of the generated Bessel beams and wavefront quality.

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Main Results:

Demonstrated tunable microaxicons with diameters ranging from 107 to 77 μm.
Achieved phase profile tunability from 12π to 24π radians, modifying the effective cone angle.
Confirmed control over the nondiffractive Bessel beam distance with low RMS wavefront deviation (λ/3).

Conclusions:

The proposed liquid crystal microaxicon array offers a simple, low-cost, and reconfigurable solution for generating tunable Bessel beams.
This technology has the potential to advance optical applications and reduce fabrication costs for micro-optical devices.