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Träfflista för sökning "L773:1674 4128 OR L773:1674 4594 "

Sökning: L773:1674 4128 OR L773:1674 4594

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1.
  • Wei, M., et al. (författare)
  • Differential absorption optical coherence tomography with strong absorption contrast agents of gold nanorods
  • 2009
  • Ingår i: Frontiers of Optoelectronics in China. - : Springer Science and Business Media LLC. - 1674-4128 .- 1674-4594. ; 2:2, s. 141-145
  • Tidskriftsartikel (refereegranskat)abstract
    • Plasmon-resonant gold nanorods (GNRs) are demonstrated as strong absorption contrast agents for optical coherence tomography (OCT). OCT imaging of tissue phantoms doped with GNRs of different resonant wavelengths and concentrations is studied. To utilize the high absorption property of GNRs, a differential absorption OCT imaging is introduced to retrieve the absorption information of GNRs from conventional backscattered signals. It is shown that the contrast of the OCT image can be enhanced significantly when the plasmon resonant wavelength of the GNRs matches the central wavelength of the OCT source.
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2.
  • Yan, Min, et al. (författare)
  • Engineering modes in optical fibers with metamaterial
  • 2009
  • Ingår i: Frontiers of Optoelectronics in China. - : Springer Science and Business Media LLC. - 1674-4128 .- 1674-4594. ; 2:2, s. 153-158
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we report a preliminary theoretical study on optical fibers with fine material inclusions whose geometrical inhomogeneity is almost indistinguishable by the operating wavelength.We refer to such fibers as metamaterial optical fibers, which can conceptually be considered as an extension from the previously much publicized microstructured optical fibers. Metamaterials can have optical properties not obtainable in naturally existing materials, including artificial anisotropy as well as graded material properties. Therefore, incorporation of metamaterial in optical fiber designs can produce a new range of fiber properties. With a particular example, we will show how mode discrimination can be achieved in a multimode Bragg fiber with the help of metamaterial. We also look into the mean field theory as well as Maxwell-Garnett theory for homogenizing a fine metamaterial structure to a homogeneous one. The accuracies of the two homogenization approaches are compared with full-structure calculation.
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