Defect-driven sequential two-photon absorption for enhanced optical limiting in Co:ZnO

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2025-01-06 DOI:10.1016/j.ijleo.2025.172213

Amegha Sahni , S. Deepika , C. Nagarajan , Seunghwoi Han , J. Kawya , T.C. Sabari Girisun , K. Manirahulan , N. Angeline Little Flower , R. Annie Sujatha

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引用次数: 0

Abstract

The optical limiting study of intrinsic and cobalt doped ZnO has been carried out in the ns regime with varying dopant concentrations. The flower-like structured, polycrystalline wurtzite ZnO has been revealed by the structural and morphological data. Presence of cobalt ions was confirmed by the Raman peaks corresponding to the Co-O-Zn vibrations and absorption peaks indicating d-d transitions in cobalt (II) ions. The single beam Z- scan technique with nano pulsed Nd-YAG laser is employed to study the nonlinear optical responses and optical limiting studies. While 5 % doped samples showed the lowest optical limiting threshold value of 18.8 GW/cm², 1 % and 3 % doped samples exhibited higher values than intrinsic ZnO. Intensity-varying nonlinear optical studies have also been performed to confirm the defects-assisted sequential two-photon absorption (2PA), which promoted the reverse saturable absorption (RSA) characteristics of the materials.

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来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.