Fluorescent photochromic molecules have two photocyclization states and the change between the fluorescent form and non-fluorescent form is reversible and depends on the wavelength of light. By placing these molecules in the vicinity of a silver nanowire, featuring the plasmon resonance, we can control the photoswitching properties of these emitters. In this work, we deposited a submicron droplet of molecules on one end of a nanowire and used focused laser to remotely change the photocyclization state of the molecule via surface plasmon polariton propagation. The effects observed for such a unique system can be applied for quantum optics and sensing.
Photon avalanche is one of the anti-Stokes upconversion processes characterized by highly nonlinear response of the emission intensity to excitation power density changes. By exceeding the critical pumping power threshold, even minute increase of this power results in a steep increase (by 2-3 orders of magnitude) of the emission intensity. While photon avalanche has been observed in bulk materials since 80-ties, it was reported in thulium-doped nanocrystals only recently, enabling to use them for single excitation beam super-resolution imaging. In current work we explore new perspectives for nanoscale avalanche phenomenon by combining the avalanching materials with plasmonically active metallic nanostructures.
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