Defect assisted optical limiting performance of hexagonal boron nitride nanosheets in aqueous suspension and PMMA nanocomposite films

ÜNLÜ B. A., KARATAY A., Yildiz E., Yola M. L., YÜKSEK M., ATAR N., ...More

OPTICAL MATERIALS, vol.121, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 121
  • Publication Date: 2021
  • Doi Number: 10.1016/j.optmat.2021.111630
  • Journal Name: OPTICAL MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Computer & Applied Sciences, INSPEC
  • Keywords: Boron nitride, Nanosheet, Optical limiting, Nonlinear absorption, Photoluminescence, QUANTUM EMISSION, MONOLAYER, BN, LUMINESCENCE, VACANCIES
  • Ankara University Affiliated: Yes

Abstract

Defect-assisted nonlinear absorption (NLA) and optical limiting (OL) performance of hexagonal boron nitride nanosheets (h-BNNS) in aqueous suspension and in polymethyl methacrylate matrix (PMMA) as nanocomposite films were studied using open-aperture Z-scan method. To evaluate the transmission in open-aperture Z-scan data, a theoretical model accounting one photon absorption (OPA), two photon absorption (TPA), free carrier absorption (FCA) and saturation of each process was considered. Defect-assisted NLA coefficients and saturation intensity thresholds were extracted from the fitting of the experimental results for 532 and 1064 nm pulse wavelengths. Strong defect-assisted NLA response of h-BNNS was observed while NLA at 532 nm was considerably stronger. This is attributed to the excitation of a greater number of defect states over a wider energy range. Our findings showed that h-BNNS/PMMA nanocomposite films feature highly required properties in OL applications and can function in OL applications in a wide spectral range (-200-1064 nm).