Second-Harmonic Young Interference in Atom-Thin Heterocrystals
arXiv:2008.02403 · doi:10.1021/acs.nanolett.0c03763
Abstract
Optical second-harmonic generation (SHG) is a nonlinear parametric process that doubles the frequency of incoming light. Only allowed in non-centrosymmetric materials, it has been widely used in frequency modulation of lasers, surface scientific investigation, and label-free imaging in biological and medical sciences. Two-dimensional crystals are ideal SHG-materials not only for their strong light-matter interaction and atomic thickness defying the phase-matching requirement but also for their stackability into customized hetero-crystals with high angular precision and material diversity. Here we directly show that SHG in hetero-bilayers of transition metal dichalcogenides (TMDs) is governed by optical interference between two coherent SH fields with material-dependent phase delays using spectral phase interferometry. We also quantify the frequency-dependent phase difference between MoS2 and WS2, which also agrees with polarization-resolved data and first-principles calculations on complex susceptibility. The second-harmonic analogue of Young double-slit interference shown in this work demonstrates the potential of custom-designed parametric generation by atom-thick nonlinear optical materials.
arXiv comment13 pages, 3 figures
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Cited by in corpus (12)
- All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors
- Parametric Nonlinear Optics with Layered Materials and Related Heterostructures
- Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
- Nonlinear optics in 2D materials: from classical to quantum
- Extraordinary Photostability and Davydov Splitting in BN-Sandwiched Single-Layer Tetracene Molecular Crystals
- Exciton-Sensitized Second-Harmonic Generation in 2D Heterostructures
- Two dimensional semiconductors: optical and electronic properties
- Third-order polarizability of interlayer excitons in hetero-bilayers
- Interlayer exciton mediated second harmonic generation in bilayer MoS2
- Dual-Polarization SHG Interferometry for Imaging Antiparallel Domains and Stacking Angles of 2D Heterocrystals
- Ubiquitous Antiparallel Domains in 2D Hexagonal Boron Nitride Uncovered by Interferometric Nonlinear Optical Imaging
- Enhanced second-harmonic generation from WS/ReSe heterostructure