Clusters of Closely Spaced Gold Nanoparticles as a Source of Two-Photon Photoluminescence at Visible Wavelengths


  • This work was supported by KAKENHI Grant-in-Aid for Scientific Research on the Priority Area “Strong Photons-Molecules Coupling Fields (No. 470)” from the Ministry of Education, Culture, Sports, Science and Technology of Japan. This work was also partially supported by Grants-in-Aid no. 17360110 and 18850001, and by Hokkaido Innovation through Nanotechnology Support (HINTS) from the Ministry of Education, Science, Sports, and Culture of Japan.


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Gold nanostructures consisting of nanoblocks separated by a few nanometer-wide gaps were fabricated, and found to exhibit strong photoluminescence due to enhancement of the optical near-field localized in the nanogaps. The fabricated structures demonstrate a nanostructured metallic material capable of efficient photoluminescence, whose efficiency can be adjusted by tailoring the nanogap width.