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Optical Intensity Discrimination with Engineered Interface States in Topological Photonic Crystals.

Bartosz Janaszek1,2, Paweł Szczepański1,2

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Summary
This summary is machine-generated.

We developed a novel 1D photonic crystal with graphene that shows tunable, intensity-dependent transmission. This nonlinear device can control laser pulses, offering an alternative to saturable absorbers.

Keywords:
Kerr effectnonlinear DBRoptical coatingsphotonic crystalstopological states

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Photonic crystals are crucial for controlling light.
  • Nonlinear optical elements are needed for advanced laser applications.
  • Graphene's unique properties offer new possibilities in optical devices.

Purpose of the Study:

  • To propose a novel 1D photonic crystal structure.
  • To achieve tunable, intensity-dependent transmission.
  • To explore its application as a nonlinear DBR element for laser pulse generation.

Main Methods:

  • Designing a 1D photonic crystal with nonlinear graphene-spacer-graphene truncation.
  • Utilizing synthetic geometrical space to engineer Fermi arc states.
  • Investigating the support of topologically protected Tamm plasmon polaritons.

Main Results:

  • Demonstrated a tunable, non-monotonic, and intensity-dependent transmission response.
  • Observed an intensity-dependent transmission peak in the THz spectral range.
  • The structure supports topologically protected Tamm plasmon polaritons.

Conclusions:

  • The proposed structure acts as a nonlinear DBR element for laser cavities.
  • It enables controllable pulse shaping, mode-locking, and Q-switching.
  • Offers a new route for compact, reconfigurable nonlinear reflectors.