Investigation of nonlinear optical properties of exfoliated MoS2 using Photoacoustic Zscan
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Investigation of nonlinear optical properties of exfoliated MoS2 using Photoacoustic Zscan Nitesh Dhasmana, Dalal Fadil, Anupama B. Kaul and Jayan Thomas MRS Advances / FirstView Article / July 2016, pp 1 - 7 DOI: 10.1557/adv.2016.456, Published online: 16 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004564 How to cite this article: Nitesh Dhasmana, Dalal Fadil, Anupama B. Kaul and Jayan Thomas Investigation of nonlinear optical properties of exfoliated MoS2 using Photoacoustic Zscan. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.456 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.456
Investigation of nonlinear optical properties of exfoliated MoS2 using Photoacoustic Zscan Nitesh Dhasmana1,2, Dalal Fadil3,4, Anupama B. Kaul3,4 and Jayan Thomas1, 2, College of Optics and Photonics, CREOL, University of Central Florida, Florida, USA. Technology Center, University of Central Florida, Florida, USA. 3Department of Metallurgical, Materials, Bio-medical Engineering, University of Texas, El Paso, TX, USA 4Department of Electrical and Computer Engineering, University of Texas, El Paso, TX, USA 1
2NanoScience
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 (PAZscan). 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.
INTRODUCTION Extensive research on graphene has laid a solid roadmap for investigation of alternative 2D materials. A class of such materials which has shown greatest promise for broad range of applications are the transition metal dicalchogenides (TMDC). Even though it has only been a decade since this exploration kicked off, these 2d materials have already proved their potential for a spectrum of applications ranging from energy storage, nano-electronics to quantum communications. Out of these mater
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