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Self-organized monocrystalline Au nanoparticles with potential applicationsin plasmonics are grown in a SrTiO$_3$ matrix by a novel two-step depositionprocess. The crystalline preferred orientation of these Au nanoparticles isinvestigated by synchrotron hard x-ray diffraction. Nanoparticlespreferentially align with the (111) direction along the substrate normal (001),whereas two in-plane orientations are found with $[110]_{SrTiO_3} \: || \:[110]_{Au}$ and $[100]_{SrTiO_3} \: || \: [110]_{Au}$. Additionally, a smallerdiffraction signal from nanoparticles with the (001) direction parallel to thesubstrate normal (001) is observed; once again, two in-plane orientations arefound, with $[100]_{SrTiO_3} \: || \: [100]_{Au}$ and $[100]_{SrTiO_3} \: || \:[110]_{Au}$. The populations of the two in-plane orientations are found todepend on the thickness of the gold film deposited in the first step of thegrowth.

Crystallographic investigation of Au nanoparticles embedded in a SrTiO$_3$ thin film for plasmonics applications by means of synchrotron radiation