Studies on NiO-PVA composite films for opto-electronics and optical limiters

B. Karthikeyan, S. Hariharan, R. V. Mangalaraja, T. Pandiyarajan, R. Udayabhaskar, P. Sreekanth

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report optical, excited-state lifetime, and nonlinear optical (NLO) properties of nickel oxide (NiO)/poly vinylalcohol (PVA) polymer free-standing films for opto-electronics and optical limiting applications. Optical absorption studies of NiO-loaded PVA films show that the exciton peaks are centered at 330 nm. Fluorescence studies reveal that the emission is due to exciton recombination and defects in NiO. Time-resolved fluorescence studies show that the recombination in PVA happens through NiO, where NiO has a faster decay time than the pure PVA. NLO measurements carried out using a 532 nm, 10-ns Nd: YAG laser, show that for a given energy, NiO/PVA shows good optical limiting, and the obtained NLO behavior is due to effective two-photon absorption.

Original languageEnglish
Article number8418385
Pages (from-to)1539-1542
Number of pages4
JournalIEEE Photonics Technology Letters
Volume30
Issue number17
DOIs
StatePublished - 1 Sep 2018
Externally publishedYes

Keywords

  • Optical power limiting
  • effective two photon absorption
  • excitons in NiO
  • polymer nanocomposite

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