We propose a method to pattern organic optically active materials based on local photo-bleaching for making wavelength selective grating. Usually, photo-bleaching is considered as a limitation for organic emitter. Here, this property is exploited to locally suppress dye emission and absorption at the microscale with abrupt interface and no changes in layer thickness. Periodic patterns were fabricated and exhibit diffraction only at 590nm wavelength with spectral selectivity of 11nm. Based on laser writer flexibility and efficiency, this study shows the potential of local photo-bleaching for several applications like wavelength selective grating fabrication.

The fabrication of nanostructured samples assembling organic, inorganic emitters, and plasmons has been widely explored in the last decades in the context of energy-harvesting applications or for the design of optoelectronic devices. However, understanding the interaction between each component in such a complex scenario is a challenge. Here we report on the energy transfer between ensembles of inorganic quantum dots and organic J-aggregates mediated by surface plasmon polaritons. The two emitters' species are spatially separated on the surface of a continuous silver film in an optically structured sample in order to measure the impact of their relative separation on the energy transfer. We introduce a theoretical model of the photoluminescence of the system to quantify the energy transfer between the two species through the chemical potential of photons.

Local photo-bleaching in dye layers is a promising method to pattern organic emitters for photonics applications like strong coupling researches or wavelength selective grating fabrication with TDBC J-aggregate layers. However, the understanding of the material change with bleaching in such layers is still ambiguous which limits this method to fully exploit its potential. Raman spectroscopy is a fast, non-destructive and readily technique to probe a material with micrometer spatial resolution but the conditions to explore bleached TDBC layers are not well known. In this work we have investigated active and bleached TDBC layers by Raman spectroscopy at different wavelengths in correlation with their optical properties. For active TDBC, Raman vibrations are well evidenced only in resonant configuration with suitable probe wavelengths (i.e when layer absorption is high and emission is low). For bleached TDBC, since layer absorption is limited to the UV range, Raman peaks are observed only under UV illumination with similar transitions compared to active layer which indicates that TDBC molecules are barely affected by the bleaching mechanism, even if the optical properties are changed around the fundamental transition. Such assumption was confirmed by XPS measurements indicating close stoichiometry and limited changes in the N chemical bonds between active and bleached material. This study allows a better understanding of the local photobleaching in TDBC dye layer for photonics applications and highlights the deep UV Raman spectroscopy as relevant tool for studying bleached organic emitters.