We analyze the statistical properties of the photons emitted at the junction of a scanning tunneling microscope at the solid/liquid interface by time-autocorrelated two-photon counting measurements, with time resoluti...We analyze the statistical properties of the photons emitted at the junction of a scanning tunneling microscope at the solid/liquid interface by time-autocorrelated two-photon counting measurements, with time resolutions down to the nanosecond scale. In the case of a gold-gold junction immersed in an inhomogeneous liquid, we show that the tip-induced luminescence exhibits a clear bunching phenomenon depending on the tip-sample distance.展开更多
A simple hand calculation method based on group theory is proposed to predict the near field maps of finite metallic nanoparticles(MNP)of canonical geometries:prism,cube,hexagon,disk,sphere,etc.corresponding to low or...A simple hand calculation method based on group theory is proposed to predict the near field maps of finite metallic nanoparticles(MNP)of canonical geometries:prism,cube,hexagon,disk,sphere,etc.corresponding to low order localized surface plasmon resonance excitations.In this article,we report the principles of the group theory approach and demonstrate,through several examples,the general character of the group theory method which can be applied to describe the plasmonic response of particles of finite or infinite symmetry point groups.Experimental validation is achieved by collection of high-resolution subwavelength near-field maps by photoemission electron microscopy(PEEM)on a representative set of Au colloidal particles exhibiting either finite(hexagon)or infinite(disk,sphere)symmetry point groups.展开更多
文摘We analyze the statistical properties of the photons emitted at the junction of a scanning tunneling microscope at the solid/liquid interface by time-autocorrelated two-photon counting measurements, with time resolutions down to the nanosecond scale. In the case of a gold-gold junction immersed in an inhomogeneous liquid, we show that the tip-induced luminescence exhibits a clear bunching phenomenon depending on the tip-sample distance.
基金The CEA authors acknowledge financial support by the French National Agency(ANR)in the frame of its program in Nanosciences and Nanotechnologies(PEEM Plasmon Project ANR-08-NANO-034,ANR P2N 2013-Samiré)NanosciencesÎle-de-France(PEEM Plasmonics project)+1 种基金the“Triangle de la Physique”(PEPS Project 2012-035T)the doctoral school“Ecole Doctorale Ondes et Matière(EDOM)”.
文摘A simple hand calculation method based on group theory is proposed to predict the near field maps of finite metallic nanoparticles(MNP)of canonical geometries:prism,cube,hexagon,disk,sphere,etc.corresponding to low order localized surface plasmon resonance excitations.In this article,we report the principles of the group theory approach and demonstrate,through several examples,the general character of the group theory method which can be applied to describe the plasmonic response of particles of finite or infinite symmetry point groups.Experimental validation is achieved by collection of high-resolution subwavelength near-field maps by photoemission electron microscopy(PEEM)on a representative set of Au colloidal particles exhibiting either finite(hexagon)or infinite(disk,sphere)symmetry point groups.
