Influence of natural surface layers on massive copper optical properties in a wide spectral range

Abstract

Optical properties of flawless bulk copper sample has been studied based on spectroellipsometry measurements in wide spectral interval (hν=0.18-4.87 eV) at various angles of light incidence. The main characteristics of electronic subsystem of this metal and values of main energy intervals in a band structure were determined for both oxidized and unoxidized copper sample.

Single-Particle Emission Spectroscopy Resolves d-Hole Relaxation in Copper Nanocubes

“…We attribute the emission peak to radiative interband transitions from the sp-band to the d-band to near the L symmetry point of the Brillouin zone of bulk copper, supported by previous ensemble studies of copper nanoparticles 39−43 and copper films. 34,35 The 633 nm excitation, with an energy below the 600 nm emission maximum but above the interband threshold of 653 nm (1.9 eV), 35,68,69 results in a spectrum that tapers off toward lower emission energies (Figure 2D). In addition, the interband recombination between electrons above the Fermi level and dholes contributes to the anti-Stokes emission from CuNCs with 633 nm excitation (Figure 2D).…”

“…The excitation wavelength dependency of the emission QY allowed us to resolve excited-state decay of d-holes. Gold nanocubes (AuNCs) of similar side lengths, shapes, and plasmonic resonance energies (Figure S1) were compared to CuNCs (Figure ) to study the effect of the band structure on d-holes as both metals have similar interband gaps at around 1.9 eV. ,− …”