تقویت جذب غیرخطی و محدودکنندگی نوری اکسید گرافن در مخلوط شدن با نانوذرات Fe2O3

نوع مقاله: مقاله پژوهشی کامل

نویسندگان

1 دانشگاه ولی عصر رفسنجان

2 دانشگاه ولی عصر (عج) رفسنجان

چکیده

در این پژوهش اکسیدگرافن (GO) با نانوذرات Fe2O3 به نسبت حجمی 1 به 10 با استفاده از التراسونیک پروبدار مخلوط شد. جذب غیرخطی GO، نانوذرات Fe2O3 و مخلوط GO-Fe2O3 با استفاده از تکنیک جاروب-z روزنه باز مورد بررسی قرار گرفت. همچنین محدودکنندگی نوری این مواد بررسی شد. مشاهده شد که جذب غیرخطی و محدودکنندگی نوری اکسیدگرافن در اثر مخلوط شدن با نانوذرات Fe2O3 تقویت شده است. منبع نوری استفاده شده در تمامی آزمایشات یک دیود لیزر پیوسته با طول‌موج 532 نانومتر بود. در نانوذرات Fe2O3 با افزایش شدت فرودی به نمونه در منحنی جاروب-z یک سوئیچ از حالت جذب اشباع به جذب اشباع معکوس مشاهده شد. در نمونه‌های GO و GO-Fe2O3 با افزایش شدت عمق دره در منحنی جاروب-z افزایش پیدا کرد و ضریب جذب غیرخطی در آنها تا یک مقدار بهینه افزایش پیدا کرد. همچنین در نمونه ی GO-Fe2O3 مشاهده شد که با افزایش طول نمونه، قدرت محدودکنندگی این نمونه افزایش پیدا می کند

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Enhancement of nonlinear absroption and optical limiting properties of graphene oxide in mixed with Fe2O3 nanoparticles

چکیده [English]

In this research, graphene oxide (GO) was mixed with Fe2O3 nanoparticles by using sonication with 10:1 volume ratio. The nonlinear absorption of graphene oxide, Fe2O3 nanoparticles, and the mixture of GO- Fe2O3 were studied by using open aperture Z-scan method. Also the optical limiting of these materials were investigated. It was observed that the nonlinear absorption and optical limiting of graphene oxide has been increased when mixed with Fe2O3 nanoparticles. The light source that was used in all experiments was a continuous wave laser diode at 532 nm wavelength. In Fe2O3 nanoparticles a switch over from saturable absorption to reverse saturable absorption behavior with increasing the input intensity was observed. In GO and GO-Fe2O3 samples with increasing intensity the depth of vally in open aperture Z-scan curves increased and their nonlinear absorption coefficient rose to an optimal value. It was also observed that in GO-Fe2O3 mixture by increasing the length of sample, optical limiting power increased.

کلیدواژه‌ها [English]

  • Z-scan method
  • Graphene oxide derivatives
  • Two photon absorption
  • Reverse saturable absorption
  • Excited state absorption
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