2016 CAP Congress / Congrès de l'ACP 2016

Orienting an ensemble of dipoles near a dielectric interface

15 Jun 2016, 14:30

15m

Colonel By B205 (University of Ottawa)

Oral (Non-Student) / orale (non-étudiant) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) W2-5 Thin Films II (DCMMP-DSS) / Couches minces II (DPMCM-DSS)

Speaker

Jonathon David White (Yuan Ze University)

Description

Fluorescence of single dipole emitters near a dielectric interface are studied. A 15 nm thick layer of polystyrene lightly doped with Rhodamine 6G was spin-cast onto cleaned glass and PMMA coated glass slides. Flourescence lifetime was found to increase by a factor of three as the PMMA spacer layer thickness was increased. This lifetime increase is accounted for by a change in the ensemble averaged distribution of the dipole orientation from isotropic to perpendicular to the interface as the spacer layer thickness increases. This reorientation occurs proceeds takes place over a 200nm range (from 100 to 300nm) of buffer layer thicknesses. The ability to tune dipole orientation and hence charge injection into 2D materials.