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Design of Prismatic Beams for Bending01:23

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
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Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
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Beam bending via plasmonic lenses.

Yanhui Zhao1, Sz-Chin Steven Lin, Ahmad Ahsan Nawaz

  • 1Department of Engineering Science and Mechanics, Pennsylvania State University, State College, Pennsylvania 16802, USA.

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|December 18, 2010
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Researchers developed novel plasmonic lenses capable of focusing and bending electromagnetic (EM) waves. These lenses achieve beam bending up to 8 degrees, offering potential in photonic communication and plasmonic circuits.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Plasmonics

Background:

  • Plasmonic lenses offer unique light manipulation capabilities.
  • Controlling electromagnetic wave propagation is crucial for advanced optical devices.

Purpose of the Study:

  • To design and characterize plasmonic lenses that can focus and bend electromagnetic waves.
  • To investigate the mechanism of beam bending through asymmetric phase retardation.

Main Methods:

  • Fabrication and characterization of three types of plasmonic lenses.
  • Numerical investigation of optical wave propagation using the finite-difference time-domain (FDTD) method.

Main Results:

  • The designed plasmonic lenses successfully focused and bent electromagnetic waves.
  • Beam bending up to 8 degrees off the axial direction was observed under normal incidence.
  • Effective beam bending was confirmed for both normal and tilted incidence.

Conclusions:

  • The developed plasmonic lenses demonstrate significant beam bending capabilities.
  • These lenses offer a large bending range and operate effectively in the far field.
  • Potential applications include photonic communication and integrated plasmonic circuits.