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Preparation of Free-Surface Hyperbolic Water Vortices

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Tailoring focused optical vortices by using spiral forked plates.

Yonghao Liang, Enliang Wang, Hailiang Li

|February 16, 2019

Summary

This summary is machine-generated.

We introduce spiral forked plates (SFPs), a novel optical element that generates two focused optical vortices (OVs) simultaneously. SFPs manipulate topological charges and suppress unwanted diffraction, advancing applications in orbital angular momentum superpositions.

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Area of Science:

Optics and Photonics
Vortex Beam Generation
Nanophotonics

Background:

Optical vortices (OVs) carry orbital angular momentum (OAM), enabling advanced applications.
Simultaneous generation of multiple OVs with controlled properties is challenging.
Current methods often lack efficiency or flexibility in manipulating OAM.

Purpose of the Study:

To propose and demonstrate a single optical element for generating two tightly focused OVs.
To investigate the manipulation of topological charges (TCs) of generated OVs.
To explore the potential of this element in OAM superposition applications.

Main Methods:

Designing and fabricating spiral forked plates (SFPs) by combining spiral zone plates (SZPs) and forked gratings (FGs) using a logic XOR operation.
Utilizing theoretical modeling to predict the performance of SFPs.
Conducting experimental verification of the OV generation and TC manipulation capabilities.

Main Results:

SFPs successfully generate two tightly focused OVs simultaneously.
The zeroth-order diffraction is completely suppressed.
The topological charges of the generated OVs can be precisely manipulated by adjusting the TCs of the SZP and FG components, following a specific TC transformation rule.

Conclusions:

SFPs offer an efficient and flexible method for generating and controlling multiple OVs.
This technology shows significant promise for miniaturization and integration in OAM superposition applications.
The demonstrated TC transformation rule provides a pathway for designing complex OAM states.