ویژگی های محدود کننده ی نوری نانوذرات پلاتین و طلا برحسب شکست غیرخطی گرمایی

اسلامی فر, مینا; اقبالی, محمد; مکاری, مجتبی

doi:10.22055/jrmbs.2022.17414

ویژگی های محدود کننده ی نوری نانوذرات پلاتین و طلا برحسب شکست غیرخطی گرمایی

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

گروه فیزیک، دانشکده علوم پایه، دانشگاه صنعتی خاتم الانبیاء، بهبهان، ایران

10.22055/jrmbs.2022.17414

چکیده

چکیده
در این مقاله، محلول های کلوئیدی نانوذرات طلا و پلاتین در آب مقطر با استفاده از روش کندگی لیزر پالس 18 نانومتری ورق‌های طلا و پلاتین خالص ساخته می‌شوند. تشکیل نانوذرات با استفاده از طیف جذب UV-Vis و مشاهدهء پیک پلاسمونی ویژه نانوذرات طلا و پلاتین و همچنین با استفاده از میکروسکوپ الکترونی عبوری تأیید می‌شود. پاسخ غیرخطی نوری محلول‌های نانوذرات طلا و پلاتین در آب تحت تابش لیزرپیوسته (( CW با طول موجnm 532 توسط تکنیک جاروب- zروزنه بسته اندازه گیری می‌شوند. عدم تقارن منحنی‌های جاروب- zحاصل، همراه با این حقیقت که تابش لیزر، پیوسته است، نشان می‌دهد که منشأ پاسخ غیرخطی نوری، گرمایی است. رفتار محدودکنندهء نوری محلول نانوذرات طلا و پلاتین در آب تحت تابش لیزر کم توان CW با طول موج 532 نانومتر بررسی می‌شود. نتایج نشان می‌دهد که خودواگرایی غیرخطی می‌تواند رفتار محدودکنندهء نوری را افزایش دهد. می‌توان با مهندسی کردن هندسه‌ء آزمایش، آستانه‌ء محدودیت نوری را به حالت تنظیم درآورد.

کلیدواژه‌ها

موضوعات

ماده چگال

عنوان مقاله [English]

Optical limiting characteristics of platinum and gold nanoparticles based on thermal nonlinear refraction

نویسندگان [English]

Mina Eslamifar
mohammad eghbali
mojtaba mokari

Physics Department, Faculty of Science, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

چکیده [English]

Abstract
In this work, the platinum and gold nanoparticles colloids are fabricated by 18 ns pulsed laser ablation of pure platinum and gold plates in the distilled water. The formation of the nanoparticles has been evidenced by taking the UV-Vis absorption spectrum and observing the surface plasmon absorption band of gold and platinum nanoparticles as well as by transmission electron microscopy.The nonlinear optical properties of the platinum and gold nanoparticles in distilled water are measured by the closed- aperture Z-scan technique under exposure to a low- power continuous-wave laser at a wavelength of 532 nm. The observed asymmetric nature of the Z-scan measurements along with the fact that the laser light is CW suggests that the origin of the nonlinear refractive index is thermo-optic. The optical limiting performance of the platinum and gold nanoparticles are characterized by exposure to CW laser operating at a wavelength of 532 nm. The results show that nonlinear self-defocusing effect increases the performance of the optical limiting. The engineering of the experimental geometry can accomplish the tunability of the limiting threshold of optical limiters.

کلیدواژه‌ها [English]

Platinum nanoparticles
Gold nanoparticles
Thermal nonlinear refraction
Optical limiter

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