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In vitro measurements of PA signal amplitudes of GNSs with and without silica shells during laser irradiation. (a) PA signal amplitudes from bare GNSs (black circles) and silica-coated GNSs (red squares) during laser irradiation. (b) Attenuations of PA signal amplitudes from bare GNSs and silica-coated GNSs after laser irradiation (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
