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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Ultrawide-bandwidth slow-light system based on THz plasmonic graded metallic grating structures.

Qiaoqiang Gan1, Zhan Fu, Yujie J Ding

  • 1Center for Optical Technologies, Electrical and Computer Engineering Department, Lehigh University, Bethlehem, Pennsylvania 18015, USA. qig206@lehigh.edu

Physical Review Letters
|July 23, 2008
PubMed
Summary

Researchers developed a new method to slow terahertz (THz) waves using graded metallic gratings. This technique effectively stops THz waves at specific locations, enabling tunable wave manipulation across a wide spectrum.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Terahertz (THz) wave manipulation is crucial for advanced spectroscopy and imaging.
  • Controlling the speed and propagation of THz waves remains a significant challenge.

Purpose of the Study:

  • To introduce a novel mechanism for significantly slowing down THz waves.
  • To demonstrate the use of metallic grating structures with graded depths for THz wave control.

Main Methods:

  • Utilizing metallic grating structures with varying depths to alter dispersion curves and cutoff frequencies.
  • Investigating the group velocity of spoof surface plasmons at cutoff frequencies.
  • Analyzing the tunability of wave stopping positions by adjusting grating depth gradients.

Main Results:

  • Achieved extremely low group velocity for spoof surface plasmons at cutoff frequencies, effectively stopping THz waves.
  • Demonstrated that THz waves are localized at different positions based on their frequencies.
  • Showcased that the separation of stopped waves can be precisely tuned by modifying the grating depth gradient.

Conclusions:

  • The proposed graded metallic grating structure offers an effective method for slowing down THz waves over an ultrawide spectral band.
  • The structure exhibits potential for operation across various temperatures, although stringent temperature stability is required.