Optical properties of thin metal films

Abstract

were determined on the basis of measured index of refraction in region of wavelength λ = 241216 Å. Two types of relations were used for the calculation. Some of them were obtained, with taking into account that refractive index of absorbing medium can be presented in the form ñ = n ± iae. Other were obtained from Maxwell boundary condition. Both approaches give rise to very close results for ae, however the dependences n = f(λ) for λ > 200 Å are essentially different. The reasons of such differences are discussed.

Optical Chopper Driven by the Casimir Force

“…According to the approach of Refs. [68][69][70], for atomically thin metallic films illuminated with visible light at the normal incidence good agreement with the measurement results is reached if in the coefficientsr (v,m) andr (m,g) entering Eq. (10) one puts κ (m) = 0.…”

“…I, atomically thin metallic films are characterized by the increased transparency and this fact should be taken into account in computations. There are several phenomenological approaches developed to gain a better understanding of relevant physical mechanisms (see, e.g., [55,[66][67][68][69][70]). According to the approach of Refs.…”

Plasmonic Properties of Close-Packed Metallic Nanoparticle Mono- and Bilayers

“…(ω) of a gold thin film 60,61 , in which we considered the dielectric function of gold calculated by the Lorentz-Drude model 62 , while for silver, F (ω) is a step-like (sigmoid) function that mimics the absorbance spectrum of a silver thin film. F (ω) is included in order to take the interband transitions into account in the fittings and α is the fitting parameter that accounts for the intensity of these transitions in the material.…”

“…To provide a relation between d and the plasmon energy and lifetime, the absorbance spectra were fitted by where ℏ ω ≡ E exc is the excitation energy, n is the number of plasmon modes, I j is the intensity, E j is the spectral position, and Γ j is the fwhm of the j -th plasmon mode. For gold, F (ω) is the characteristic absorbance A 0 (Au) (ω) of a gold thin film, , in which we considered the dielectric function of gold calculated by the Lorentz–Drude model, while for silver, F (ω) is a steplike (sigmoid) function that mimics the absorbance spectrum of a silver thin film. F (ω) is included in order to take the interband transitions into account in the fittings and α is the fitting parameter that accounts for the intensity of these transitions in the material.…”