Nonlinear optical properties of core shell type II quantum dot structures

Çadirci M., Gündoğdu Y., Elibol E., KILIÇ H. Ş.

Optics and Laser Technology, cilt.128, 2020 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 128
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.optlastec.2020.106246
  • Dergi Adı: Optics and Laser Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: CdSe/CdTe, Femtosecond Z-scan, Type-II quantum dots
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this study, CdSe/CdTe Type-II quantum dots (QDs) were synthesized using dropwise method. The core/shell nanocrystals have been characterized by UV–Vis absorption and photoluminescence (PL) spectroscopies, transmission electron microscopy and z-scan technique. Nonlinear properties of each type of quantum dots were studied using femtosecond(fs) z-scan method at 800 nm wavelength with different laser intensities. Fs laser z-scan experimental set-up are used to determine two photon absorption coefficient (β ̴10−12 cm/W) and nonlinear optical Kerr coefficient (n2 ̴ 10−20 cm2/W. The imaginary and real parts of third order susceptibility (X(3)) were calculated based on β and n2 under different laser intensities for seven different core/shell QDs. Third order susceptibility for CdSe/CdTe type II QDs was found to be about 10−12 esu.