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Generation and Conversion Dynamics of Dual Bessel Beams with a Photonic Spin-Dependent Dielectric Metasurface
- Source :
- Physical Review Applied. 15
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- A Bessel beam has the properties of propagation invariance and a self-healing effect, leading to a variety of interesting phenomena and applications. Recently, as a planar diffractive element with miniaturized size, metasurfaces are widely employed to manipulate light in the subwavelength region, including generating a Bessel beam. However, such a metasurface-generated Bessel beam allows output light with no tunable functions. Here, with the interplay of the geometric phase and the dynamic phase, we propose a method to generate and allow conversion from any orthogonal polarizations to independent Bessel beams with a single-layer dielectric metasurface. The simulation results indicate that the arbitrary conversion between different Bessel beams is related to the spin-dependent orbit motion caused by the tight-focusing effect, leading to the singularity of the spot. This physical mechanism is well studied and the theoretical model for revealing the dependence of different incident polarization on the conversion dynamics is presented. Our approach paves a way for efficient generation and multifunctional applications, ranging from high-numerical-aperture devices to compact nanophotonic platforms for spin-dependent structured beams.
- Subjects :
- Physics
business.industry
Phase (waves)
Nanophotonics
Physics::Optics
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
Polarization (waves)
01 natural sciences
symbols.namesake
Planar
Optics
Geometric phase
0103 physical sciences
symbols
Bessel beam
Photonics
010306 general physics
0210 nano-technology
business
Bessel function
Subjects
Details
- ISSN :
- 23317019
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- Physical Review Applied
- Accession number :
- edsair.doi...........c426fa9b2438959ba7a13e3a4146f921