New Insight into Collimated Plasmon Beam: Nondiffracting versus Linear Focusing

Abstract

We worked out a new group of collimated plasmon beams by the means of in-plane diffraction with symmetric phase modulation. As the phase type changes from 1.8 to 1.0, the beam undergoes an interesting evolution from focusing to a straight line. Upon this, an intuitive diagram was proposed to elucidate the beam nature and answer the question whether they are nondiffracting or linear focusing. Based on this diagram, we further achieved a highly designable scheme to modulate the beam intensity (e.g., 'lossless' plasmon). Our finding holds remarkable generality and flexibility in beam engineering and would inspire more intriguing photonic designs.

References in corpus (4)

• Generation and near-field imaging of Airy surface plasmons
• Plasmonic Airy Beam on Metal Surface
• Nonparaxial Mathieu and Weber accelerating beams
• Non-Paraxial Accelerating Beams

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• Coherence and aberration effects in surface plasmon polariton imaging
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• Mode-matching metasurfaces: coherent reconstruction and multiplexing of surface waves
• Diffraction-Free Bloch Surface Waves