Plasmon modes

Inset Figure 8 shows that the sizes of most of the particles remain similar. However, it can be observed that, in part of the TEM pattern, some particles form chains, which are either close together or coalesced. The presence of the two plasmon modes (Fig. 8B) indicates an optical anisotropy due to the nonspherical shape of the particles, as shown on the TEM grid (inset Fig. 8). 

Rendell, R., Scalapino, D. and Miihlschlegel, B. (1978) Role of local plasmon modes in light emission from small-particle tunnel junctions. Rhys. Rev. Lett., 41, 1746-1750. 

Wavefunction Images of Plasmon Modes of Cold Nanorod — Near-Field Transmission Method... 

Figure 3.4 Schematic view of plasmon modes of a metal nanorod.

In summary, it has been demonstrated that plasmon-mode wavefunctions of gold nanoparticles resonant with the incident light can be visualized by near-field transmission imaging. 

In this chapter, we have provided an overview of near-field imaging and spectroscopy of noble metal nanoparticles and assemblies. We have shown that plasmon-mode wavefunctions and enhanced optical fields of nanoparticle systems can be visualized. The basic knowledge about localized electric fields induced by the plasmons may lead to new innovative research areas beyond the conventional scope of materials. 

Near-field optical imaging of plasmon modes in gold nanorods. J. Chem. Phys., 122, 154701 (5 pages). 

Imura, K. and Okamoto, H. (2008) Ultrafast photoinduced changes of eigenfunctions of localized plasmon modes in gold nanorods. Phys. Rev. B, 77, 041401(R) (4 pages). 

Plasmon mode imaging of single gold nanorods./. Am. Chem. Soc., 126, 12730-12731. 

Near-field two-photon-induced photoluminescence from single gold nanorods and imaging of plasmon modes. J. Phys. Chem. B, 109, 13214-13220. 

Fig. 9.9 The calculated mode profiles for (a) a surface plasmon mode propagating along a 50 nm thick Au film, with an excitation wavelength of X 800 nm (note the plasmon field amplitude within the Au film is multiplied by 10 for clarity), and (b) a silicon PWEF waveguide with silicon core thickness of 220 nm, for an input wavelength of X 1550 nm...

Mirkin CA, Millstone JE, Park S, Shuford KL, Qin L, Schatz GC (2005) Observation of a Quadrupole Plasmon Mode for a Colloidal Solution of Gold Nanoprisms. J Am Chem Soc 127 5312-5313... 

Here, Ti, T2 and 02022 are the widths and resonance frequencies of the surface plasmon modes of the carbon cage, respectively [44] (the plasmons at the inner and outer surfaces are coupled oscillators and have two normal modes [59])... 

Decreasing the BWF component of the G-mode in nanotube water solution and in a film with organic molecules supports the assumption that coupling between plasmon modes and the G-mode is weaker in individual nanotubes and thin bundles than in thick bundles. 

Bemdt, R., and J. K. Gimzewski. 1991. Inelastic tunneling excitation of tip-induced plasmon modes on noble-metal surfaces. Phys. Rev. Lett. 67 3796-3799. 

ASpr = 520 to 540 nm), with colloidal dispersions producing a characteristic wine-red color. If the Au nanoparticles are smaller than 5 nm, the LSPR peak is broadened due to surface scattering.14 If the nanospheres are much greater than 40 nm (the approximate mean free path of an electron in Au), the LSPR shifts to longer wavelengths due to retardation effects, and secondary peaks may appear due to multipolar plasmon modes. 

Infrared active modes couple to the free carrier plasma and the energy of the coupled phonon-plasmon mode is sensitive to the electron density [3,20-22], In the range 1 x 1017 cm 3 < n < 1019 cm 3 the following approximation can be used for the free electron density as a function of the Ai(LO) mode frequency vmax [21] ... 

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