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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Bends and splitters in graphene nanoribbon waveguides.

Xiaolong Zhu1, Wei Yan, N Asger Mortensen

  • 1DTU Fotonik - Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

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|March 14, 2013
PubMed
Summary

We studied bends and splitters in graphene nanoribbon waveguides. Sub-wavelength widths prevent additional loss, enabling compact terahertz devices.

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Area of Science:

  • Optoelectronics
  • Nanotechnology
  • Photonics

Background:

  • Graphene nanoribbon waveguides are being explored for terahertz (THz) applications.
  • Waveguide components like bends and splitters are crucial for integrated photonic circuits.
  • Graphene's optical properties present unique opportunities and challenges for device design.

Purpose of the Study:

  • To evaluate the performance of bends and splitters in graphene nanoribbon waveguides.
  • To determine if these components introduce additional losses beyond the inherent loss of graphene.
  • To explore the potential for realizing ultra-compact THz devices using these components.

Main Methods:

  • Numerical simulations were performed to analyze the behavior of bends and splitters.
  • Transmission line theory was employed for qualitative interpretation of simulation results.
  • The impact of nanoribbon width, specifically sub-wavelength dimensions, was investigated.

Main Results:

  • Bends and splitters in graphene nanoribbon waveguides do not induce additional optical loss.
  • This loss-free performance is achieved when the nanoribbon width is sub-wavelength.
  • Transmission line theory provides a valid framework for understanding the observed phenomena.

Conclusions:

  • Sub-wavelength graphene nanoribbons are suitable for creating low-loss waveguide components.
  • The findings support the development of compact and efficient devices for terahertz applications.
  • This research opens avenues for novel integrated photonic circuits in the THz spectrum.