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Volumn 112, Issue 16, 2008, Pages 6293-6298

Light localization effect on the optical properties of opals doped with gold nanoparticles

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; ASTROPHYSICS; CYTOTOXICITY; ELECTROMAGNETISM; GOLD; MICROSPHERES; NANOPARTICLES; NANOSTRUCTURED MATERIALS; NANOSTRUCTURES; OPTICAL PROPERTIES; PHOTONIC CRYSTALS; POLYMER BLENDS; SEMICONDUCTING CADMIUM TELLURIDE; SILICATE MINERALS;

EID: 47249114833     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp711040r     Document Type: Article
Times cited : (44)

References (50)
  • 26
    • 47249127482 scopus 로고    scopus 로고
    • Transmittance spectra in Figure 2 are reported in arbitrary units to better compare spectra for thin AuNP doped opals with much thicker bare ones in particular for what concerns the spectral shift due to infiltration and the shape of spectra.
    • Transmittance spectra in Figure 2 are reported in arbitrary units to better compare spectra for thin AuNP doped opals with much thicker bare ones in particular for what concerns the spectral shift due to infiltration and the shape of spectra.
  • 27
    • 47249114267 scopus 로고    scopus 로고
    • As we showed in a previous paper (see Adv. Func. Mater. 2007, 17, 2770) the random distribution of AuNP inside the highly doped opals interstices removes the symmetry of the system thus making the photonic band structure unaffected by light polarization, conversely from that observed in bare opals
    • As we showed in a previous paper (see Adv. Func. Mater. 2007, 17, 2770) the random distribution of AuNP inside the highly doped opals interstices removes the symmetry of the system thus making the photonic band structure unaffected by light polarization, conversely from that observed in bare opals
  • 28
    • 47249147367 scopus 로고    scopus 로고
    • see Appl. Phys. Lett. 2002, 82, 4068 (03) and references cited therein, For this reason, we report in this paper the dispersion of the spectra for TE polarization only. Data for TM polarization are identical within experimental error for all samples investigated
    • (see Appl. Phys. Lett. 2002, 82, 4068 (03) and references cited therein). For this reason, we report in this paper the dispersion of the spectra for TE polarization only. Data for TM polarization are identical within experimental error for all samples investigated.
  • 30
    • 47249088929 scopus 로고    scopus 로고
    • The dielectric constant of interstices partially filled with AuNP is determined by inversion of the Lorentz-Lorenz, effective medium formula by using neff values determined from the Bragg-Snell fit as an input, being n, 1.59 for PS microspheres. This method was previously discussed in: Adv. Func. Mater. 2007, 17, 2770
    • eff values determined from the Bragg-Snell fit as an input, being n = 1.59 for PS microspheres. This method was previously discussed in: Adv. Func. Mater. 2007, 17, 2770.
  • 31
    • 47249141064 scopus 로고    scopus 로고
    • The PBG structure has been calculated with a code based on the plane wave expansion (see Pavarini, E, et al. Phys. Rev. B 2005, 72, 045102, Input data of this code are the sphere diameter, the lattice type, the fraction compact in our case, and the real dielectric constant of sphere and interstices. The calculation gives a rough estimate of the position of the photonic band of the opal since it neglects the dispersion of the refractive index and the imaginary part of the dielectric function [see Joannopulos, J. D, Meade, R. D, Win, J. N. Photonic Crystals: Molding the Flow of the Light; Princeton University Press: Princeton, NJ, 1995, However, a careful analysis of the reflectance spectra shows that in the spectral range of surface plasmon resonance, no spectral features are observed except the interference fringes having an intensity less than 1, and noise level less 0.3% with respect to the photonic stop band. This sets the upper sensitivity
    • The PBG structure has been calculated with a code based on the plane wave expansion (see Pavarini, E.; et al. Phys. Rev. B 2005, 72, 045102). Input data of this code are the sphere diameter, the lattice type, the volume fraction (compact in our case), and the real dielectric constant of sphere and interstices. The calculation gives a rough estimate of the position of the photonic band of the opal since it neglects the dispersion of the refractive index and the imaginary part of the dielectric function [see Joannopulos, J. D.; Meade, R. D.; Win, J. N. Photonic Crystals: Molding the Flow of the Light; Princeton University Press: Princeton, NJ, 1995]. However, a careful analysis of the reflectance spectra shows that in the spectral range of surface plasmon resonance, no spectral features are observed except the interference fringes having an intensity less than 1 % and noise level less 0.3% with respect to the photonic stop band. This sets the upper sensitivity limit for plasmon band intensity and means that the intensity of the plasmon band is at least more than 30 times lower than that of the stop band. This implies a relatively low absorption of AuNP. In fact, the only minor suggestion for the presence of an absorption is provided by the reduction of reflectance background for photon energies immediately below the stop band. This fact makes us confident that our band structure calculation is, as a first approximation, reasonable and the effect of absorption can be treated as a perturbation and then interpreted in a qualitative way.


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