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Investigation of nonlinear optical properties of exfoliated MoS2 using Photoacoustic Zscan

Published online by Cambridge University Press:  16 June 2016

Nitesh Dhasmana ,
Dalal Fadil ,
Anupama B. Kaul  and
Jayan Thomas
Nitesh Dhasmana*
Affiliation:
College of Optics and Photonics, CREOL, University of Central Florida, Florida, USA. NanoScience Technology Center, University of Central Florida, Florida, USA.
Dalal Fadil
Affiliation:
Department of Metallurgical, Materials, Bio-medical Engineering, University of Texas, El Paso, TX, USA Department of Electrical and Computer Engineering, University of Texas, El Paso, TX, USA
Anupama B. Kaul
Affiliation:
Department of Metallurgical, Materials, Bio-medical Engineering, University of Texas, El Paso, TX, USA Department of Electrical and Computer Engineering, University of Texas, El Paso, TX, USA
Jayan Thomas
Affiliation:
College of Optics and Photonics, CREOL, University of Central Florida, Florida, USA. NanoScience Technology Center, University of Central Florida, Florida, USA.
*
*(Email: n.dhasmana@knights.ucf.edu)
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Abstract

We studied nonlinear absorption characteristics of exfoliated Molybdenum disulphide (MoS2) dispersion in 1-Methyl-2-pyrrolidinone and demonstrate a dual absorption characteristic at 532nm nanosecond pulsed laser wavelength. A number of recent reports demonstrate a saturable absorption in MoS2 and other 2D materials at low fluences and a deviation from this saturable absorption at higher fluence using open aperture Z scan (OZ scan) technique. It has been suggested that this deviation at higher fluences is due to nonlinear optical scattering. We have recently developed a new technique which combines OZ scan and photoacoustic Z-scan (PAZ-scan). It can measure photoacoustic and optical transmission signals simultaneously. The data obtained from both signals are employed to find nonlinear absorption parameters in non-linear optical materials. Our results reveal that non-linear scattering is not the cause of deviation of 2D materials from saturable absorption at higher fluences. We propose that the optical limiting behavior at higher fluence in these 2D materials is dominated by free carrier absorption.

Keywords

absorptionopticalacoustic
Type
Articles
Information
MRS Advances , Volume 1 , Issue 47: Electronics and Photonics , 2016 , pp. 3215 - 3221
Copyright
Copyright © Materials Research Society 2016 

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References

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