Spatiotemporally controlled nano-sized third harmonic generation agents

Biomedical Optics Express
Dmitry NevozhayKonstantin V Sokolov

Abstract

Here, we present a new class of third harmonic generation (THG) imaging probes that can be activated with precise spatiotemporal control using non-linear excitation. These probes consist of lipid-coated perfluorocarbon nanodroplets with embedded visible chromophores. The droplets undergo phase transition from liquid to gas upon heating mediated by two-photon absorption of NIR light by the embedded dyes. Resulting microbubbles provide a sharp, local refractive index mismatch, which makes an excellent source of THG signal. Potential applications of these probes include activatable THG agents for biological imaging and "on-demand" delivery of various compounds under THG monitoring.

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Citations

Dec 8, 2020·Biomedical Optics Express·Paul BoernerKonstantin V Sokolov
Jun 7, 2021·Current Opinion in Cell Biology·Kendelle J MurphyPaul Timpson

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