Polarization-dependent fluorescence from an anisotropic gold/polymer hybrid nano-emitter

Abstract

International audienceBased on nanoscale photopolymerization triggered by the dipolar surface plasmon mode, we developed a light-emitting gold nanoparticle/Eosin Y-doped polymer hybrid nanostructure. Due to the anisotropic spatial distribution of the dipolar surface plasmon mode during photopolymerization, this nano-emitter is anisotropic in both geometry and emission. The trapped dye molecules in the hybrid nanostructure display fluorescence intensity that is dependent upon the polarization of the incident excitation light. This nano-emitter further allows the photo-selection of fluorescence configuration (i.e., molecule concentration and refractive index of active medium) by controlling the incident polarization

Plasmon-based photopolymerization: near-field probing, advanced photonic nanostructures and nanophotochemistry

“…Unlike conventional hybrid plasmonic light-emitting systems with a random or isotropic distribution of dye molecules around the metal nanoparticle [64,65], this anisotropic spatial distribution of dye allows an optical selection of the molecules by using incident polarization. A recent study has been published on an anisotropic NE based on an isolated gold nanosphere with a diameter of 70 nm [66]. Linear polarization of the incident light produced 15 nm thick polymer structures integrated in the Y-axis as figure 9(A) presents.…”

“…respectively, where q is the intrinsic (free space) quantum yield and γ 0 ex is the excitation rate of the dye molecule in free space, Q is the nanoparticle-modified quantum yield and γ ex is the excitation rate of the dye molecule by the local electric field. Q can be calculated from the Mie Theory [66,67]. γ 0 ex and γ ex are expressed as functions of the incident field and local electric field, i.e., γ 0…”

“…It should be stressed out that the molecular dipole orientation was not controlled in this experiment. An averaged molecule orientation was therefore applied for the calculation [66,67]. As a consequence…”

“…In the case of NES x , considering equation ( 5), the optical near-field enhances the local electromagnetic field at any point in the vicinity of metal nanoparticle except for the points where n ⊥ E loc . As a consequence, fluorescence of a certain percentage (η) of the molecules in the photopolymer nanostructure can be enhanced by the near-field when the incident polarization is oriented perpendicular to the polymer lobes [66]. In this situation, equation ( 11) can be modified as The first component on the right side of equation (12) represents the molecules excited by both S x and S y configurations, while the second component represents the molecules distributed in the near-field of S x and outside the nearfield of S y .…”

Influence of Cracks on the Optical Properties of Silver Nanocrystals Supracrystal Films

“…Noble metal nanocrystals had aroused the interest of researchers over the past few decades owing to their particular optical properties. These peculiarities were driven by the localized surface plasmon resonance (LSPR), which induced a strong optical absorption evolving with several parameters such as the geometry, size, or chemical environment of nanostructures. − Silver (Ag) was identified as the “best” noble metal for its optical properties; however, it is difficult to characterize mainly due to surface oxidation. Although there has been a recent review on silver parameters, large uncertainties still exist on some parameters …”