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Related Experiment Video

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Terahertz tunable three-dimensional photonic jets.

Behrooz Rezaei1, Babak Yahyapour2,3, Arash Darafsheh4

  • 1Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz, Tabriz, Iran. rezaeibhr@yahoo.com.

Scientific Reports
|July 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers created tunable terahertz photonic jets using dielectric micro-objects coated with a bulk Dirac semimetal layer. Adjusting the semimetal

Keywords:
3D FDTDBulk Dirac semimetalPhotonic jetTerahertz

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Photonic jets are localized electromagnetic fields near transparent micro-objects.
  • Terahertz (THz) regime offers unique properties for light-matter interactions.

Purpose of the Study:

  • To demonstrate the formation of tunable 3D photonic jets in the terahertz regime (terajets).
  • To investigate the dynamic modulation of terajets using dielectric micro-objects coated with a bulk Dirac semimetal (BDS) layer.

Main Methods:

  • Utilized dielectric micro-objects (spheres, cylinders, cubes) coated with a BDS layer.
  • Employed uniform beam illumination and varied the Fermi energy of the BDS layer.
  • Analyzed terajets for TE and TM polarizations and studied the impact of incident beam obliquity.

Main Results:

  • Successfully formed 3D tunable terajets by coating dielectric micro-objects with a BDS layer.
  • Demonstrated dynamic modulation of terajet optical characteristics by tuning the BDS layer's refractive index via Fermi energy.
  • Observed polarization dependency and preservation of focal region intensity over a wide angular range for asymmetric terajets.

Conclusions:

  • Tunable terajets can be generated using BDS-coated dielectric micro-objects.
  • Fermi energy tuning of the BDS layer provides dynamic control over terajet properties.
  • Asymmetric terajets with preserved intensity show potential for scanning device applications.