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[Prof. Sunmin Ryu] Second-Harmonic Young’s Interference in Atom-Thin Heterocrystals

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Second-Harmonic Young’s Interference in Atom-Thin Heterocrystals  

Second-Harmonic Young’s Interference in Atom-Thin Heterocrystals 

Wontaek Kim, Je Yhoung Ahn, Juseung Oh, Ji Hoon Shim, and Sunmin Ryu* 

Second-harmonic generation (SHG) is a nonlinear optical process that converts two identical photons into a new one with doubled frequency. Two-dimensional semiconductors represented by transition metal dichalcogenides are highly efficient SHG media because of their excitonic resonances. Using spectral phase interferometry, here we directly show that SHG in hetero-bilayers of MoS2 and WS2 is governed by optical interference between two coherent SH fields that are phase-delayed differently in each material. We also quantified the frequency-dependent phase difference between the two, which agreed with polarization-resolved data and first-principles calculations on complex susceptibility. The second-harmonic analogue of Young’s double-slit interference shown in this work demonstrates the potential of custom-designed parametric generation by atom-thick nonlinear optical materials.   https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.0c03763


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