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Nonlinear optical parameters of borate glasses with Ag nanoparticles formed using reducing Gd3+ ions

Dutka R. M., Adamiv V. T., Burak Ya. V., Gamernyk R. V. and Teslyuk I. M.

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Abstract. Basing on experimental absorption spectra and Z-scan spectra measured in the closed- and open-aperture regimes, we have calculated the nonlinear optical parameters (the refractive index n2, the absorption coefficient , and the third-order susceptibility (3)) of borate glasses (BGs) Li2B4O7–Gd2O3–Ag2O, CaB4O7 -Gd2O3-Ag2O and LiCaBO3-Gd2O3Ag2O that include Ag nanoparticles (NPs). The Ag NPs have been formed by annealing the glasses in the air atmosphere at the temperatures close to the glass-transition ones. We have proven that Gd3+ represents an efficiently reducing ion in the BGs. We have also ascertained that the plasmon resonance caused by the presence of Ag NPs increases significantly the nonlinear optical parameters n2, and│(3)│of the BGs.

Keywords: borate glasses, Ag nanoparticles, nonlinear refractive index, third-order nonlinear susceptibility, nonlinear absorption coefficient

PACS: 61.46.-w, 64.70.ph 
UDC: 535.663+535.331
Ukr. J. Phys. Opt. 16 103-110
doi: 10.3116/16091833/16/2/103/2015
Received: 27.04.2015

Анотація. На основі експериментальних спектрів поглинання та спектрів Z-скану в режимах із закритою і відкритою діафрагмою розраховано нелінійно-оптичні параметри (показник заломлення n2, коефіцієнт поглинання і сприйнятність третього порядку (3)) для боратних стекол Li2B4O7–Gd2O3–Ag2O, CaB4O7 -Gd2O3-Ag2O і LiCaBO3-Gd2O3Ag2O з наночастинками (НЧ) Ag. НЧ Ag було сформовано шляхом відпалу стекол в атмосфері повітря за температур, близьких до температур скловання. Доведено, що йони Gd3+ є ефективними йонами-відновлювачами в боратних стеклах. Установлено, що зумовлений НЧ Ag плазмонний резонанс суттєво підвищує нелінійно-оптичні параметри боратних стекол n2, і│(3)│. 
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