Unravelling the synergistic effect of reduced graphene oxide on optical, phonon and optical power limiting properties of
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Unravelling the synergistic effect of reduced graphene oxide on optical, phonon and optical power limiting properties of rGO/ α‑MoO3 nanohybrids Venkadeshkumar Ramar1 · B. Karthikeyan1 Received: 25 March 2020 / Accepted: 22 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Reduced graphene oxide (rGO) and semiconducting metal oxide nanohybrids is an emerging class of attractive candidates towards many optical and optoelectronic applications. Herein, we investigated the nonlinear optical properties of rGO/αMoO3 nanohybrids through open aperture z scan technique under nanosecond pulses at 532 nm excitation which shows the two-photon absorption (2PA) behavior. We found that the synergistic effect between rGO and α-MoO 3 plays a significant role in the enhancement of optical power limiting properties. The variation in refractive index (n) and extinction coefficient (k) of α-MoO3 and rGO/α-MoO3 were calculated using the Kramers–Kronig (K–K) equations from the optical reflectance spectroscopic studies. The effect of rGO concentration on the lifetime phonons of singly, doubly, and triply coordinated stretching vibrations of terminal oxygen was investigated from Raman spectroscopic studies. Our experimental results imply that rGO/α-MoO3 has better optical power limiting property with the highest 2PA coefficient compared to previous literature (listed in the table). Keywords rGO/MoO3 nanocomposites · Optical properties · Phonon lifetime · Two-photon absorption coefficient · Charge transfer
1 Introduction Since the arrival of laser, it has been widely used in military, medical, mode-lockers, 3-D data storage, pulse shaping devices, non-destructive bio-imaging and material processing etc. As a result of the above-mentioned laser-based applications, the protection of photosensitive components is very important because of unexpected high intense laser radiations the components can be easily damaged [1]. To overcome this problem, significant consideration has been given to the development of optical power limiting (OL) devices which can attenuate high intense light and transmit the low intense optical beams. The best optical limiting Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03749-2) contains supplementary material, which is available to authorized users. * B. Karthikeyan [email protected] 1
Nanophotonics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620015, India
materials should have short optical response time, high linear optical transmittance, low optical limiting threshold, high laser damage threshold and broadband spectral response [2]. So far, several optical limiting materials like organic compounds, noble metal clusters, inorganic semiconductors, carbon nanotubes, graphene oxide, reduced graphene oxide, and polymer materials have been explored. Even though organic materials have outstanding OL properties, poor stability against optical and thermal bleaching effects limits its pr
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