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Surface Plasmon-Based Pulse Splitter and Polarization Multiplexer.

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The Journal of Physical Chemistry Letters
|November 2, 2018
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Summary
This summary is machine-generated.

Investigating surface plasmon polaritons (SPPs) launched by s-polarized light reveals a unique bifurcated wave packet structure. This discovery offers potential for advanced nanophotonic circuits, including polarization multiplexing and pulse splitting applications.

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Ultrafast Optics

Background:

  • Surface plasmon polaritons (SPPs) are crucial for nanoscale light manipulation.
  • Exciting SPPs with different polarizations can yield distinct propagation characteristics.

Purpose of the Study:

  • To investigate the spatial and temporal properties of SPPs launched by s-polarized femtosecond laser excitation.
  • To explore the potential applications of s-polarized launched SPPs in nanophotonic devices.

Main Methods:

  • Utilizing photoemission electron microscopy to study SPPs.
  • Employing a pump-probe technique with orthogonally polarized femtosecond laser pulses.
  • Conducting finite difference time domain (FDTD) calculations for corroboration.

Main Results:

  • Observed an s-polarized launched SPP with a distinct bifurcated spatial profile, comparable in intensity to p-polarized excitation.
  • Characterized the SPP as two spatially distinct, temporally phase-locked wave packets, one-half period out of phase.
  • Experimental findings were consistent with FDTD simulations.

Conclusions:

  • S-polarized excitation generates a unique SPP mode with potential for polarization multiplexing.
  • The observed SPP wave packet structure can be harnessed for applications like pulse splitting in nanophotonic circuits.