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Plasmonic enhancement of gold nanorods. a) Absorbance of aqueous gold nanorod solution in relation to the laser wavelength (inset: transmission electron microscopy image of gold nanorods, scale bar = 50 nm). b) Mechanism of the photothermal effect, where the nanorods absorb near-infrared light at their surface plasmon resonance (800 nm) to produce a thermal output.
