Unlocking the quantum potential of nitrogen-vacancy (NV) centers in diamonds has led to innovative advancements in sensing applications. By coupling NV centers with plasmonic nanostructures, ultrasensitive biolabels are envisioned. To this end, we exploit DNA self-assembly to create hybrid plasmonic nanodiamonds, featuring a closed nanocavity encapsulating a single nanodiamond. Correlated spectroscopy reveals enhanced brightness and emission rates, crucial for quantum sensing. This synergy between plasmonics and diamond fluorescence augments photon emission intensity and accelerates emission rates, enabling improved temporal resolution. These nanodiamonds hold promise as stable single-photon sources and versatile platforms for probing quantum effects in biology. This talk highlights the development, properties, and potential applications of these nanodiamonds, bridging quantum sensing and biomedicine, and fostering transformative changes in biophotonics.
Unlocking the potential of colloidal metamaterials—artificial materials mirroring molecular structures—holds promise for diverse applications, from optical engineering to catalytic chemistry. Yet, orchestrating precise self-assembly of colloidal metamaterials remains challenging due to the lack of regioselective surface chemistry. Addressing this, we introduce a novel strategy employing DNA-patched nanoparticles to drive the self-assembly of colloidal metamolecules. By utilizing magnetic bead-assisted DNA cluster transfer, we overcome geometrical constraints, enabling regioselective DNA patches. This approach is highly scalable and versatile, affording diverse configurations. We showcase the creation of gold and silver nanoparticle-based colloidal metamolecules, demonstrating the strategy's broad applicability. Notably, we employ this method to position fluorescent nanodiamonds within silver nanocube dimers, enabling precise control over photophysical properties. Our approach revolutionizes colloidal metamaterial synthesis, paving the way for tailored nanoscale functionalities in fields such as biological sensing and optical physics.
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