Article 2021 · 13 atıf

Reduced Graphene Oxide Thin Film with Strong Optical Nonlinearity

Heidari, Behzad, Ghamsari, Morteza Sasani, Salmani, Somayeh, Ahmadi, Mehrnoush, Majles-Ara, Mohammad Hossein

Özet

Herein, a simple, low-cost, and scalable process is developed to prepare the reduced graphene oxide (rGO) thin films (TFs) with strong optical nonlinearity. To do so, a chemical reduction method (using inorganic agent hydroiodic acid) and drop-casting technique are used. Optical nonlinearity of the prepared thin rGO film is measured by the Z-scan technique at low light intensity (continuous-wave wavelength of 632 nm). The result of optical nonlinearity responses is illustrated by a remarkable nonlinear refraction index (n(2) approximate to 10(-4) cm(2) W-1) as well as a considerable nonlinear absorption coefficient (beta = 1.43 x 10(-8) cm(2) W-1) compared with similar reported results. Moreover, experimental results show that the prepared film enjoys a positive nonlinear refractive index with strong optical nonlinearity. Results also confirm that the changes made in optical absorption of rGO TFs are due to state filling effects and the optical nonlinearity proportional to the carriers' density is in fact due to thermal effects of SiO2 substrate.

Anahtar Kelimeler

reduced graphene oxide saturable absorbers strong optical nonlinearity thin films Z&#8208 scans SATURABLE ABSORBERS LIMITING PROPERTIES REFRACTIVE-INDEX ABSORPTION REDUCTION PHOTONICS

WoS Kategorileri

Physics, Condensed Matter

Künye

Dergi: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Yıl: 2021
Cilt: 258
Sayı: 3
ISSN: 0370-1972
eISSN: 1521-3951
DOI: 10.1002/pssb.202000397
WoS UID: WOS:000596069800001

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