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Engineering of orbital angular momentum supermodes in coupled optical waveguides
A Turpin1, G Pelegrí1, J Polo1
1Departament de Física, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Spain.
Scientific Reports
|April 27, 2017
Summary
Researchers demonstrated orbital angular momentum (OAM) bright and dark supermodes in coupled waveguides. Dissipation enables filtering of dark supermodes, paving the way for OAM mode cloners and inverters.
Area of Science:
- Optics and Photonics
- Waveguide Physics
Background:
- Orbital angular momentum (OAM) modes possess unique spiral phase fronts.
- Coupled waveguide systems are fundamental for optical signal processing.
Purpose of the Study:
- To investigate the existence and behavior of OAM bright and dark supermodes in evanescently coupled cylindrical waveguides.
- To explore the coupling dynamics of OAM modes in triangular waveguide configurations.
- To demonstrate the potential for OAM mode filtering and manipulation.
Main Methods:
- Theoretical analysis of three evanescently coupled cylindrical waveguides.
- Investigating mode coupling in a triangular arrangement of waveguides.
- Simulating the effect of dissipation on dark supermodes.
Main Results:
- Existence of OAM bright and dark supermodes demonstrated.
- Complex inter-waveguide mode couplings observed due to OAM spiral phase fronts.
- Dissipation successfully filters out dark supermodes.
Conclusions:
- OAM supermodes exhibit distinct coupling behaviors in waveguide systems.
- Triangular waveguide arrangements lead to unique OAM mode interactions.
- Dissipative filtering offers a method for designing OAM mode cloners and inverters.
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