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Identifier 000388275
Title Intense femtosecond photoexcitation of bulk and monolayer MoS2
Alternative Title Αλληλεπίδραση υπερβραχέων παλμών λέιζερ με το δυσδιάστατο κρύσταλλο MoS2
Author Παραδεισανός, Ιωάννης Μ.
Thesis advisor Φωτάκης, Κωνσταντίνος
Reviewer Στρατάκης, Εμμανουήλ
Κιοσέογλου, Γεώργιος
Abstract Molybdenum disulfide (MoS2) is a two-dimensional inorganic compound classified as a metal dichalcogenide. It is a 2D-semiconductor that has attracted great interest because of its distinctive electronic, optical, and catalytic properties, as well as its importance for dry lubrication. Its physical properties make it desirable for various optoelectronic and photonic applications, including phototransistors, light emitters, and heterojunction solar cells. Towards the development of 2D photonic devices, the investigation of 2D materials response under intense photoexcitation by ultrashort pulses, as well as of their ultrafast optical properties, including nonlinear susceptibility, refraction, absorption, and carrier relaxation, is undoubtedly important. In this thesis, the intense femtosecond laser excitation on the structure of bulk and monolayer MoS2, under conditions ranging from lattice heating to material damage is experimentally investigated. For this purpose, the intensity of A1g and E12g vibrational modes was recorded as a function of the number of irradiation pulses. Through this process, the single-pulse damage threshold in monolayer MoS2 was identified and compared to that of the bulk crystal. Besides this, optical and field emission scanning electron microscopy (FESEM) were used for the optical damage quantification. Experiments reveal large differences in the ultrafast laser excitation response of monolayer compared to the bulk.
Language English
Subject Damage
Δισουλφίδιο του μολυβδενίου
Υπερβραχείς παλμοί
Issue date 2014-11-21
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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