16
A. Hu et al.
Fig. 1.8 The extinction spectra of silver nanoplates in a variety of sizes. (Reprinted with permission
from [75]. Copyright 2011 American Chemical Society)
Fig. 1.9 The polarization dependence of the LSPs for nanoparticles in orthogonal directions.
(Reprinted with permission from [76]. Copyright 2015 Royal Society of Chemistry)
1.3.3 Propagation Along an Optical Nanofiber (Optical
Mode) and Metallic Nanowire (Plasmonic Mode)
Conventional dielectric fibers can guide electromagnetic modes with the core diameter thicker than the cut-off diameter. The lateral mode size in a dielectric fiber is
limited by the diffraction limit to the order of λ/n, and will restrict higher degrees
of miniaturization. Shown in Fig. 1.10, when the fiber diameter d is decreased,
the evanescent fields of the fundamental mode extend deeper into the surrounding
medium, which will degenerate the field confinement. Further decreasing the fiber
diameter eventually turns the guided mode into a bulk plane-wave in the medium
surrounding the fiber. The smallest mode size of conventional dielectric fiber is thus
limited to a micrometer scale [77, 78].
Optical Nanofibers are one-dimensional (1D) nanoscale optical fibers with diameters in subwavelength scale (several hundred nanometers or less) respect to the guided
light [79]. Compared with commercial glass fibers with diameters from several
A. Hu et al.
Fig. 1.8 The extinction spectra of silver nanoplates in a variety of sizes. (Reprinted with permission
from [75]. Copyright 2011 American Chemical Society)
Fig. 1.9 The polarization dependence of the LSPs for nanoparticles in orthogonal directions.
(Reprinted with permission from [76]. Copyright 2015 Royal Society of Chemistry)
1.3.3 Propagation Along an Optical Nanofiber (Optical
Mode) and Metallic Nanowire (Plasmonic Mode)
Conventional dielectric fibers can guide electromagnetic modes with the core diameter thicker than the cut-off diameter. The lateral mode size in a dielectric fiber is
limited by the diffraction limit to the order of λ/n, and will restrict higher degrees
of miniaturization. Shown in Fig. 1.10, when the fiber diameter d is decreased,
the evanescent fields of the fundamental mode extend deeper into the surrounding
medium, which will degenerate the field confinement. Further decreasing the fiber
diameter eventually turns the guided mode into a bulk plane-wave in the medium
surrounding the fiber. The smallest mode size of conventional dielectric fiber is thus
limited to a micrometer scale [77, 78].
Optical Nanofibers are one-dimensional (1D) nanoscale optical fibers with diameters in subwavelength scale (several hundred nanometers or less) respect to the guided
light [79]. Compared with commercial glass fibers with diameters from several