People know that the plasmonic-metal nanostructures have an enormous enhancement in both local electric field and absorption/scattering events under incident light irradiation with an appropriate frequency. When we want to compare the light absorption efficiency between these material with the traditional light-absorber, such as the semiconductors and the dye molecules which have a similar absorption spectrum, are there any quantitative ways to tell us the results? for example, use the effective cross-section of light absorption?
Yes, such numbers are available. For example, the absorption cross-section of 40nm Au NP is 2.93X10^-15 m^2 that corresponds to the molar absorption coefficient of 7.66X10^9 M^-1cm^-1 at 528 nm. This value is 5 orders larger than the molar extinction coefficient for indocyanine green: 1.08 X10^4 M^-1 cm^-1 at 778 nm.
Similarly other strongly absorbing dyes such as rhodamine-6G (1.16X 10^5 M^-1 cm^-1 at 530 nm) and malachite green (1.49X 10^5 M^-1 cm^-1 at 617 nm) have
4 orders much lower absorption as compared to the nanoparticles.
Source: Jain et al "Calculated Absorption and Scattering Properties of Gold Nanoparticles of Different Size, Shape, and Composition: Applications in Biological Imaging and Biomedicine,"J. Phys. Chem. B 2006, 110, 7238-7248
Yes, such numbers are available. For example, the absorption cross-section of 40nm Au NP is 2.93X10^-15 m^2 that corresponds to the molar absorption coefficient of 7.66X10^9 M^-1cm^-1 at 528 nm. This value is 5 orders larger than the molar extinction coefficient for indocyanine green: 1.08 X10^4 M^-1 cm^-1 at 778 nm.
Similarly other strongly absorbing dyes such as rhodamine-6G (1.16X 10^5 M^-1 cm^-1 at 530 nm) and malachite green (1.49X 10^5 M^-1 cm^-1 at 617 nm) have
4 orders much lower absorption as compared to the nanoparticles.
Source: Jain et al "Calculated Absorption and Scattering Properties of Gold Nanoparticles of Different Size, Shape, and Composition: Applications in Biological Imaging and Biomedicine,"J. Phys. Chem. B 2006, 110, 7238-7248
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