Far-infrared studies of two-dimensional random metal-insulator composites

Noh, T. W.; Song, PH; Lee, Sung‐Ik; Harris, Daniel C.; Gaines, J. R.; Garland, J. C.

doi:10.1103/physrevb.46.4212

Cited by 20 publications

(13 citation statements)

References 36 publications

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“…For example, the anomalous absorption in the near-infrared spectral range leads to unusual behavior of the transmittance and reflectance of the film. [20][21][22][23][24][25] A number of effectivemedium theories were proposed for calculation of the optical properties of random films, including the Maxwell-Garnett and Bruggeman approaches and their various modifications; 2,22,23,26 these approaches, however, do not allow one to calculate the local fields, experiencing giant spatial fluctuations associated with the existence of the hot spots. A theory for the local-field distribution in percolation films has been developed in Refs.…”

Section: And 17͒mentioning

confidence: 99%

Near-field optical studies of semicontinuous metal films

et al. 2001

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Local field distributions in random metal-dielectric films near a percolation threshold are experimentally studied using scanning near-field optical microscopy ͑SNOM͒. The surface-plasmon oscillations in such percolation films are localized in small nanometer-scale areas, ''hot spots,'' where the local fields are much larger than the field of an incident electromagnetic wave. The spatial positions of the hot spots vary with the wavelength and polarization of the incident beam. Local near-field spectroscopy of the hot spots is performed using our SNOM. It is shown that the resonance quality-factor of hot spots increases from the visible to the infrared. Giant local optical activity associated with chiral plasmon modes has been obtained. The hot spot's large local fields may result in local, frequency and spatially selective photomodification of percolation films.

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Section: And 17͒mentioning

confidence: 99%

Near-field optical studies of semicontinuous metal films

et al. 2001

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“…Near and well-below the percolation threshold, the anomalous absorbance can be as high as 50%. [12][13][14][15][16]20 A number of theories were proposed for calculation of the optical properties of semicontinuous random films, including the effective-medium approaches, 30,31 their various modifications, 3,16,17,[32][33][34][35][36] and the renormalizationgroup method ͑see, e.g. Refs.…”

Section: Introductionmentioning

confidence: 99%

Local electric and magnetic fields in semicontinuous metal films: Beyond the quasistatic approximation

et al. 2000

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A theory of optical, infrared, and microwave response of metal-dielectric inhomogeneous films is developed. The generalized Ohm's law is formulated for the important case, when the inhomogeneity length scale is comparable with or larger than the skin ͑penetration͒ depth in metal grains. In this approach electric and magnetic fields outside a film can be related to the currents inside the film. Our computer simulations, with the use of the generalized Ohm's law approximation, reproduce the experimentally observed prominent absorption band near the percolation threshold. Calculations show that the local electric and magnetic fields experience giant spatial fluctuations. The fields are localized in small spatially separated peaks: electric and magnetic hot spots. In these hot spots the local fields ͑both electric and magnetic͒ exceed the applied field by several orders of magnitude. It is also shown that transmittance of a regular array of small holes in a metal film is strongly enhanced when the incident wave is in resonance with surface polaritons in the film. In addition, there is a skin resonance in transmission, which is of a purely geometrical nature.

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“…6,[8][9][10] A number of effective-medium theories were proposed for calculation of the optical properties of semicontinuous random films, including the Maxwell-Garnett 11 and Bruggeman 12 approaches and their various modifications. [5][6][7]13 The renormalization group method is also widely used to calculate effective dielectric response of 2D percolating films near the percolation threshold ͑see Refs. 14 and 15, and references therein͒.…”

Section: Introductionmentioning

confidence: 99%

Theory of giant Raman scattering from semicontinuous metal films

et al. 1997

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The local electric fields in a semicontinuous metal film are shown to exhibit giant fluctuations in the visible and infrared spectral ranges, when the dissipation in metallic grains is small. The field fluctuations result in significantly enhanced Raman scattering from semicontinuous metal films. The scaling analysis is performed to describe giant Raman scattering in the vicinity of the percolation threshold. A theory of Raman scattering from these films is developed. A numerical method based on the theory is suggested and used to calculate Raman scattering from silver semicontinuous films. Results of the simulations are compared with recent experimental observations. ͓S0163-1829͑97͒03119-6͔

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Far-infrared studies of two-dimensional random metal-insulator composites

Cited by 20 publications

References 36 publications

Near-field optical studies of semicontinuous metal films

Near-field optical studies of semicontinuous metal films

Local electric and magnetic fields in semicontinuous metal films: Beyond the quasistatic approximation

Theory of giant Raman scattering from semicontinuous metal films

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