Embedding a nondiffracting defect site in helical lattice wave-field by optical phase engineering

TL;DR

This paper introduces a phase engineering method to create nondiffracting defect sites within helical lattice wave-fields, enabling scalable and wavelength-independent optical structures with potential applications in various media.

Contribution

A novel technique for optically inducing nondiffracting defect sites in helical lattice wave-fields using phase superposition of a Bessel beam and a lattice wave-field.

Findings

Successful numerical and experimental generation of ND defect beams.

The method is wavelength independent and scalable.

Potential for applications in photosensitive media.

Abstract

We present a technique to optically induce a defect site in helical lattice wave-field where the combined wave-field continues to maintain its nondiffracting (ND) nature. This is done by coherently superposing a helical lattice wave-field and a Bessel beam by method of phase engineering. The results are confirmed by numerical simulations and experimentally as well by generating the ND defect beam by displaying the numerically calculated phase pattern on a phase-only spatial light modulator. This technique is wavelength independent, completely scalable, and can easily be used to generate or transfer these structures in any photosensitive medium.