Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS2, WSe2, MoS2 and Mo 0.5 W0.5 S2
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BIKORIMANA, Simeon, LAMA, Pemba T., WALSER, Ardie D., DORSINVILLE, Roger, ANGHEL, Sergiu, MITIOGLU, Anatolie, MICU, A., KULYUK, Leonid. Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS2, WSe2, MoS2 and Mo 0.5 W0.5 S2. In: Optics Express, 2016, nr. 18(24), pp. 20685-20695. ISSN 1094-4087. DOI: https://doi.org/10.1364/OE.24.020685
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Optics Express
Numărul 18(24) / 2016 / ISSN 1094-4087

Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS2, WSe2, MoS2 and Mo 0.5 W0.5 S2

DOI: https://doi.org/10.1364/OE.24.020685

Pag. 20685-20695

Bikorimana Simeon1, Lama Pemba T.1, Walser Ardie D.1, Dorsinville Roger1, Anghel Sergiu2, Mitioglu Anatolie2, Micu A.2, Kulyuk Leonid23
 
1 York College of the City University of New York,
2 Institute of Applied Physics, Academy of Sciences of Moldova,
3 Moscow Technological University (MIREA)
 
Disponibil în IBN: 22 iulie 2022


Rezumat

 Synthetic two-dimensional transition metal dichalcogenides such as, tungsten disulphide (WS2), tungsten diselenide (WSe2), molybdenum disulphide (MoS2) as well as mixed molybdenum tungsten disulphide (Mo0.5W0.5S2) single crystals were grown by the chemical vapor transport method using halogens (bromine or chlorine) as transport agents. Multi- layer samples were cleaved from the single crystals, and their nonlinear optical (NLO) properties were obtained from both open aperture and closed aperture Z-scan measurements using a picosecond mode-locked Nd: YAG laser operating at a wavelength of 1064 nm, with pulse duration of 25 ps, and 20 Hz repetition rate. Both WS2 and MoS2 exhibited nonlinear saturable absorption (SA), whereas WSe2 and Mo0.5W0.5S2 showed nonlinear two-photon absorption (2PA). A large 2PA coefficient β as high as + 1.91×10-8 cm/W was obtained for the Mo0.5W0.5S2, and an index of refraction coefficient γ = -2.47×10-9 cm2/W was obtained for the WSe2 sample.

Cuvinte-cheie
Computerized tomography, molybdenum, Molybdenum compounds, Neodymium lasers, Optical multilayers, Pulse repetition rate, refractive index, Selenium compounds, single crystals, Sulfur compounds, transition metals, Transport properties, tungsten, Two photon processes