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Related Concept Videos

Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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Unsymmetric Bending - Angle of Neutral Axis01:15

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Standing Waves in a Cavity

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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Published on: March 19, 2016

Transformation bending device emulated by graded-index waveguide.

Y Wang1, C Sheng, H Liu

  • 1Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.

Optics Express
|June 21, 2012
PubMed
Summary

Researchers created a transformation device using a gradient-index waveguide to guide visible light around corners. This method minimizes scattering and reflection losses, matching experimental with numerical findings.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Transformation optics enables novel light manipulation.
  • Gradient-index (GRIN) materials offer spatially varying refractive properties.
  • Dielectric waveguides are fundamental components in integrated photonics.

Purpose of the Study:

  • To emulate a transformation device using a gradient-index waveguide.
  • To demonstrate guiding visible light around a sharp corner with low loss.
  • To validate the proposed method through experimental and numerical comparisons.

Main Methods:

  • Fabrication of a gradient thickness dielectric waveguide to achieve a spatially varied effective index.
  • Design and simulation of a transformation device based on the GRIN waveguide.
  • Experimental demonstration of visible light guiding around a 90-degree bend.

Main Results:

  • Successful emulation of a transformation device using a tailored GRIN waveguide.
  • Demonstration of visible light propagation around a sharp corner with minimal scattering and reflection losses.
  • Experimental results closely aligned with numerical simulations, validating the design.

Conclusions:

  • Gradient-index waveguides provide a viable platform for realizing transformation optics devices.
  • The proposed method offers a practical approach for low-loss light guiding in integrated photonic circuits.
  • This technology has potential applications in compact optical routing and manipulation.