期刊
OPTICS EXPRESS
卷 31, 期 12, 页码 19746-19753出版社
Optica Publishing Group
DOI: 10.1364/OE.486719
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We experimentally study the tunability of second harmonic generation (SHG) in a 2D material/dielectric film/substrate layered structure. The tunability arises from two interferences: one between the incident fundamental light and its reflected light, and the other between the upward SH light and the reflected downward SH light. We demonstrate variations of three orders of magnitude in the SHG signals from a monolayer MoS2/TiO2/Ag layered structure.
We experimentally study the tunability of second harmonic generation (SHG) from a two-dimensional (2D) material in a 2D material/dielectric film/substrate layered structure. Such tunability arises from two interferences: one is between the incident fundamental light and its reflected light, and the other is between the upward second harmonic (SH) light and the reflected downward SH light. When both interferences are constructive, the SHG is maximally enhanced; it becomes attenuated if either of them is destructive. The maximal signal can be obtained when both interferences are perfectly constructive, which can be realized by choosing a highly reflective substrate and an appropriate thickness for a dielectric film that has a large difference in its refractive indices at the fundamental and the SH wavelengths. Our experiments demonstrate variations of three orders of magnitude in the SHG signals from a monolayer MoS2/TiO2/Ag layered structure.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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