Optical properties of solid Na and Li between 0.6 and 3.8 eV

Abstract

Optical constants of Na and Li in the form of evaporated thick solid films have been determined between 0.6 and 3.8 eV by ellipsometry. Measurements were made at room temperature through the quartz substrate at the quartz-metal interface. The optical conductivity of Na agrees well with the earlier data of Smith, while that of Li exhibits considerable differences from the results of Mathewson and Myers. The parameters of the nearly-free-electron model have been derived from the real part of the dielectric function, and the results compared with previous data.

Size dependence of multipolar plasmon resonance frequencies and damping rates in simple metal spherical nanoparticles

“…9) with the following parameters: ε N a ∞ = 1.06 [13], ω Fig. 1 a) and b)) reproduces the optical constants n measured for liquid and solid sodium [14,15] (open and closed circles on Fig. 1) quite well.…”

“…1) quite well. However, the dielectric properties for lithium [15] (squares in Fig. 1 a) and b)) and cesium [16] (triangles in Fig.…”

“…Below we discuss the trends of expected corrections to the plasmon resonance frequencies due to the modifications in parameters ε ∞ , ω p and γ entering the metal dielectric function 9. We also demonstrate the importance of the optical properties of environment in determining the position of plasmon resonance of given polarity l. Experimental: Cs [15] Na liquid [13] Na solid [14] Li [14] Re(e) were assumed. Plasmon oscillations are always damped (Fig.…”

“…Let's notice, that the optical constants of metals [14,15,16] were measured in high vacuum conditions and for metals of extremely clean surfaces. However, optical experiments with metal nanoparticles are performed usually under less strict laboratory conditions, for rather contaminated particles.…”

Size dependent index of refraction and absorption of a spherical metal cluster

“…The maximum is always ''blue'' shifted with respect to the resonance frequency (R). In the studied range of frequencies the values of differs dramatically from the bulk value ( 1.99 [22]) satisfied for frequencies fulfilling the condition:…”