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Photonic nanohelix generated by a binary spiral axicon.
Applied Optics
|May 4, 2016
Summary
Researchers created a helical light beam, a photonic nanohelix, using a specialized optical element called a binary spiral axicon. This breakthrough offers precise control over light shaping for advanced optical applications.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Beam Shaping
Background:
- Generating controlled light structures is crucial for advanced optical applications.
- Diffraction of light by specialized optical elements offers a pathway to novel beam profiles.
Purpose of the Study:
- To demonstrate the generation of a helical photonic nanojet (photonic nanohelix).
- To investigate the influence of illuminating beam parameters on the photonic nanohelix characteristics.
- To experimentally validate the simulated results.
Main Methods:
- Solving the Helmholtz equation using the finite element method for simulation.
- Utilizing a binary spiral axicon for beam diffraction.
- Employing a near-field scanning optical microscope for experimental validation.
Main Results:
- Simulated photonic nanohelix with a depth of focus (DOF) of 2.21 μm and FWHM of 304.5 nm.
- Experimental validation showing a DOF of 2.00±0.25 μm and FWHM of 339±5 nm.
- Achieved intensity maximum 11.59 times higher than the incident beam.
Conclusions:
- The study successfully demonstrates the generation of a photonic nanohelix using a binary spiral axicon.
- The results confirm the feasibility of controlling photonic nanohelix properties through beam parameters.
- Experimental validation aligns with theoretical predictions, confirming the potential of this technique.
