Cubic Nonlinearity of Transition Metal Dichalcogenides in Atomic Layers for Defense Applications
Abstract
Major Goals: The major goals of project were: 1) to characterize the cubic nonlinearity of 2-dimensional (2D) transition metal dichalcogenides (TMDCs, MX2; M=Mo or W; X=S and Se) atomic layers for DoDs nonlinear photonic applications; 2) to train the number of graduate and undergraduate students in emerging technologies related to the 2D atomic layers; and 3) to strengthen the pipeline of good students pursuing advanced degrees in science and technology through outreach activities involving local and regional schools. Accomplishments: The following activities are accomplished under the goal during the reporting period: Material preparation of mechanically exfoliated atomic layers of two-dimensional transition metal dichalcogenides (TMDCs, MX2; M: Mo or W; X: S or Se) on Si-wafer, sapphire window, and liquid suspension for Z-scan and spatial self-phase modulation. Study of cubic nonlinearity of TMDC atomic layer using the open and closed Z-scan and spatial self-phase modulation as functions of applied intensities and sample positions. The characterization includes: (1) nonlinear transmittance as functions of the sample positions in open z-scan for different excitation intensities; (2) nonlinear transmittance as functions of the sample positions in closed z-scan for different excitation intensities; (3) the magnitude and polarity of third-order nonlinearity; (4) nonlinear transmittance as a functions of the input intensity (I-scan) at the focal plane of open Z-scan, and the valley and peak positions of nonlinear transmittance in closed Z-scan for the potential applications of optical modulator and photonic devices; and (5) magnitudes and polarities of cubic nonlinearities of atomic layer liquid suspensions. Analyses of exciton polarization dephasing time of tungsten diselenide (WSe2) atomic layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 20, 2019
- Accession Number
- AD1096066
Entities
People
- Felix Jaetae Seo
Organizations
- Hampton University