scholarly journals Tailoring the Nonlinear Optical Response of Some Graphene Derivatives by Ultraviolet (UV) Irradiation

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 152
Author(s):  
Aristeidis Stathis ◽  
Zoi Bouza ◽  
Ioannis Papadakis ◽  
Stelios Couris
Keyword(s):  
Uv Irradiation ◽  
Nonlinear Optical ◽  
Irradiation Time ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Simple Strategy ◽  
Custom Made ◽  
Graphene Derivatives ◽  
The Impact

In the present work the impact of in situ photoreduction, by means of ultraviolet (UV) irradiation, on the nonlinear optical response (NLO) of some graphene oxide (GO), fluorographene (GF), hydrogenated fluorographene (GFH) and graphene (G) dispersions is studied. In situ UV photoreduction allowed for the extended modification of the degree of functionalization (i.e., oxidization, fluorination and hydrogenation), leading to the effective tuning of the corresponding sp2/sp3 hybridization ratios. The nonlinear optical properties of the studied samples prior to and after UV irradiation were determined by means of the Z-scan technique using visible (532 nm), 4 ns laser excitation, and were found to change significantly. More specifically, while GO’s nonlinear optical response increases with irradiation time, GF and GFH present a monotonic decrease. The graphene dispersions’ nonlinear optical response remains unaffected after prolonged UV irradiation for more than an hour. The present findings demonstrate that UV photoreduction can be an effective and simple strategy for tuning the nonlinear optical response of these graphene derivatives in a controllable way, resulting in derivatives with custom-made responses, thus more suitable for different photonic and optoelectronic applications.

Exploring the impact of central core modifications among several push-pull configurations to enhance nonlinear optical response

2020 ◽  
Vol 100 ◽  
pp. 107665
Author(s):  
Aqsa Saeed ◽  
Shabbir Muhammad ◽  
Shafiq-ur Rehman ◽  
Shamsa Bibi ◽  
Abdullah G. Al-Sehemi ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Central Core ◽  
Nonlinear Optical Response ◽  
The Impact

scholarly journals Nonlinear optical response of GaN layers on sapphire: The impact of fundamental beam interference

2000 ◽  
Vol 76 (7) ◽  
pp. 810-812 ◽  
Author(s):  
I. V. Kravetsky ◽  
I. M. Tiginyanu ◽  
Ralf Hildebrandt ◽  
Gerd Marowsky ◽  
D. Pavlidis ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Fundamental Beam ◽  
The Impact

scholarly journals Erratum: “Nonlinear optical response of GaN layers on sapphire: The impact of fundamental beam interference” [Appl. Phys. Lett. 76, 810 (2000)]

2000 ◽  
Vol 76 (11) ◽  
pp. 1479-1479
Author(s):  
I. V. Kravetsky ◽  
I. M. Tiginyanu ◽  
Ralf Hildebrandt ◽  
Gerd Marowsky ◽  
D. Pavlidis ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Fundamental Beam ◽  
The Impact

scholarly journals Nonlinear optical response of some Graphene oxide and Graphene fluoride derivatives

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Nikolaos Liaros ◽  
Ioannis Orfanos ◽  
Ioannis Papadakis ◽  
Stelios Couris
Keyword(s):  
Graphene Oxide ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Third Order ◽  
Nonlinear Properties ◽  
Graphene Derivatives ◽  
532 Nm

AbstractThe nonlinear optical properties of two graphene derivatives, graphene oxide and graphene fluoride, are investigated by means of the Z-scan technique employing 35 ps and 4 ns, visible (532 nm) laser excitation. Both derivatives were found to exhibit significant third-order nonlinear optical response at both excitation regimes, with the nonlinear absorption being relatively stronger and concealing the presence of nonlinear refraction under ns excitation, while ps excitation reveals the presence of both nonlinear absorption and refraction. Both nonlinear properties are of great interest for several photonics, opto-fluidics, opto-electronics and nanotechnology applications.

Crystal polarity control of ZnO films and nonlinear optical response

2009 ◽  
Vol 1201 ◽  
Author(s):  
Jin Sub Park ◽  
Yoshiki Yamazaki ◽  
Yoshihiro Takahshi ◽  
Tsutomu Minegishi ◽  
Seunghwan Park ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Buffer Layers ◽  
Nonlinear Optical Response ◽  
Control Technique ◽  
Zno Films ◽  
Growth Technique ◽  
Polarity Inversion

AbstractWe report that the nonlinear optical response of polarity controlled ZnO films grown by selective growth technique of Zn-polar and O-polar ZnO layers on sapphire substrate using Cr-compound buffer layers. ZnO layers grown on CrN/sapphire show Zn polar, while those grown on Cr2O3/sapphire result in O-polar ZnO films. In order to verify the origin of nonlinear optical response of ZnO, the polarity-controlled ZnO thin films grown on different buffer layers were investigated as nonlinear optical materials for second harmonic generation (SHG). The effective nonlinear optical coefficient (deff) of ZnO grown on Cr-compound buffer layers showed a higher value than that of ZnO grown on MgO buffer layers. Finally, by combining suggested in-situ polarity control technique with photolithography technique, we have fabricated 1D and 2D periodically-polarity-inverted (PPI) hetro-structures with periodicity ranging from 60 μm to 2 μm. The lateral polarity inversion is confirmed by piezo response microscopy. Such PPI ZnO heterostructures show the enhancement of SHG intensity comparing with the ZnO films.

scholarly journals Enhancing and Tuning the Nonlinear Optical Response and Wavelength-Agile Strong Optical Limiting Action of N-octylamine Modified Fluorographenes

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2319
Author(s):  
Aristeidis Stathis ◽  
Michalis Stavrou ◽  
Ioannis Papadakis ◽  
Ievgen Obratzov ◽  
Stelios Couris
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Optical Response ◽  
Nonlinear Optical Properties ◽  
Nonlinear Optical Response ◽  
Covalent Functionalization ◽  
Strong Enhancement ◽  
Graphene Derivatives ◽  
The Way

Fluorographene has been recently shown to be a suitable platform for synthesizing numerous graphene derivatives with desired properties. In that respect, N-octylamine-modified fluorographenes with variable degrees of functionalization are studied and their nonlinear optical properties are assessed using 4 ns pulses. A very strong enhancement of the nonlinear optical response and a very efficient optical limiting action are observed, being strongly dependent on the degree of functionalization of fluorographene. The observed enhanced response is attributed to the increasing number of defects because of the incorporation of N-heteroatoms in the graphitic network upon functionalization with N-octylamine. The present work paves the way for the controlled covalent functionalization of graphene enabling a scalable access to a wide portfolio of graphene derivatives with custom-tailored properties.

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