Multicolor Microscopy and Spectroscopy Reveals the Physics of the One-Photon Luminescence in Gold Nanorods

Abstract

This work demonstrates for the first time that one-photon luminescence in gold nanorods is an entirely plasmon-induced process. To achieve this goal, we used confocal microscopy in combination with higher order laser modes as well as light spectroscopy. We show that gold nanorod luminescence can be produced in three different ways: first, by directly exciting their longitudinal and transversal plasmon modes; second, by an energy transfer from the transversal to the longitudinal plasmon mode promoted by electron−holes pairs; and third, by conversion of directly excited electron holes pairs into the longitudinal plasmon mode.

Synthesis, Structure, and Frequency‐Doubling Effect of Calcium Cyanurate

“…[16] The crystal powders were both ground in agate mortars before recording NLO-spectra. [18,19]. A detailed description can be found in Refs.…”

Nanoplasmonic Photoluminescence Spectroscopy at Single‐Particle Level: Sensing for Ethanol Oxidation

“…[14] They found that the PL spectrum closely reproduces the shape of the scattering spectrum and assigned the PL to the radiative decay of surface plasmons.B yc ollecting the PL spectrum of as ingle Au NR with 785 nm excitation, they excluded that interband transitions are the cause of the PL. Such aP Lm echanism of single Au NR was also confirmed and elucidated by Wackenhut et al [15] After understanding the intrinsical physics of PL in single Au NRs,t he PL spectroscopy can be explored as ad irect nanoplasmonic probe of local catalytic reactions on excited Au NRs.Herein, we describe as ensing method for plasmoninduced ethanol oxidation reactions at the single-particle level by using plasmonic PL spectroscopy.Ethanol oxidation is ac ommon model reaction relevant for photocatalytic H 2 production, since ethanol is widely used as an efficient electron donor.T his work can help us to better understand the interaction between ethanol and photo-excited Au NPs in direct SPR-induced photocatalysis as well as in the system of plasmonic photocatalyst, for example,A u-TiO 2 .…”

“…It indicates that electron transfer does not equally affect the transverse and longitudinal modes.F urthermore, compared with the emission from the TSPR mode (ca. 5f s), the emission linked to the LSPR mode has arelatively longer lifetime ranging from 9t o1 8f s. [15] It indicates that the LSPR PL is easier to be influenced for the occurrence of interfacial interactions. Thus,t he LSPR PL can be explored as ad irect nanoplasmonic probe for local catalytic reactions on excited Au NPs.…”

Tuning the fields focused by a high NA lens using spirally polarized beams (Invited Paper)

“…[1,2]. In parallel, the exploitation of anisotropic polarized excitation sources like radially/azimuthally polarized doughnut beams (R/APDBs) have been essential, e.g., for increasing the excitation and detection efficiency in near-field tip-enhanced microscopy [3,4] , revealing the orientation, shape, and structure of strongly polarized nanostructures [5][6][7][8] , or increasing the ability to disclose the organization of collagen domains in animal and human skin [9] . These and other prominent studies have relied on sophisticated and ingeniously made light sources integrated into self-build microscopes.…”