Abstract
Surface plasmon resonant nanoantennas can confine incident energy onto two-dimensional (2D) transition metal dichalcogenides (TMD) to enhance efficiency of harmonic conversion to higher energies, which is otherwise limited by the intrinsic A-scale interaction length. Second harmonic generation (SHG) from nanoantenna-decorated 2D TMD was heuristically examined with hyper Rayleigh scattering (HRS), multi-photon microscopy, electron energy loss spectroscopy (EELS), and discrete dipole computation. HRS experimentally quantified the frequency dependence of the second-order nonlinear susceptibility, x(2), for liquid-exfoliated WS2. Measured x(2) fell within 21% of independent density functional theory (DFT) calculations, overcoming the known 100-1000x overestimation of microscopy approaches. EELS supported design of nanoantennas for integration with TMD. Overall SHG conversion efficiencies from chemical vapor-deposited (CVD) 4x105 nm2 MoS2 crystals on silicon dioxide were enhanced up to 0.025 % W-1 in the presence of by single 150 nm Au nanoshell monomers and dimers, ostensibly due to augmented local plasmonic fields.
Original language | American English |
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Number of pages | 7 |
DOIs | |
State | Published - 2018 |
Event | SPIE Nanoscience + Engineering - San Diego, California Duration: 19 Aug 2018 → 23 Aug 2018 |
Conference
Conference | SPIE Nanoscience + Engineering |
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City | San Diego, California |
Period | 19/08/18 → 23/08/18 |
NREL Publication Number
- NREL/CP-5900-72811
Keywords
- 2D materials
- electron energy loss spectroscopy
- hyper Rayleigh scattering
- multiphoton microscopy
- nonlinear optics
- plasmon resonance
- second harmonic generation