Abstract
The virtual modes are obtained for a free-electron-gas model of a metallic slab. These modes, excitations of the crystal which couple to radiative fields outside the slab, correspond to a mixture of collective electron motion and photons. It is shown that a knowledge of the virtual modes leads to a complete understanding of those aspects of the optical properties related to the long-wavelength collective behavior of the electrons. In particular, the existence of radiative surface modes is established. These modes markedly affect the low-frequency optical properties. Manifestations of the virtual modes in experimental situations other than optical investigations are discussed. The dispersion of the ordinary nonradiative surface plasmons at long wavelengths is also calculated using the same general technique. The result is in accord with a previous calculation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
