SEM micrographs of Au nanoparticles microring structures fabricated using different pulse energies: a) 140 µJ; b) 350 µJ; c) 490 µJ. A number of laser pulses – 5000; repetition rate – 1 kHz; pulse duration ~ 300 ps; d) Transmission spectra of Au nanoparticles structures which were fabricated using 140 µJ, 350 µJ and 490 µJ energy pulses and 5000 number of pulses when reference spectrum is a glass sample; Insert in d) is SEM image of Au nanoparticles in microring structure.

SEM micrographs of Au nanoparticles microring structures fabricated using different pulse energies: a) 140 µJ; b) 350 µJ; c) 490 µJ. A number of laser pulses - 5000; repetition rate – 1 kHz; pulse duration ~ 300 ps; d) Transmission spectra of Au nanoparticles structures which were fabricated using 140 µJ, 350 µJ and 490 µJ energy pulses and 5000 number of pulses when reference spectrum is a glass sample; Insert in d) is SEM image of Au nanoparticles in microring structure.

SEM micrographs of Au nanoparticles microring structures fabricated using different pulse energies: a) 140 µJ; b) 350 µJ; c) 490 µJ. A number of laser pulses – 5000; repetition rate – 1 kHz; pulse duration ~ 300 ps; d) Transmission spectra of Au nanoparticles structures which were fabricated using 140 µJ, 350 µJ and 490 µJ energy pulses and 5000 number of pulses when reference spectrum is a glass sample; Insert in d) is SEM image of Au nanoparticles in microring structure.

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