Twist Phase Matching in Two-Dimensional Materials
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review Letters, Volume 131, issue 23
Abstract
Optical phase matching involves establishing a proper phase relationship between the fundamental excitation and generated waves to enable efficient optical parametric processes. It is typically achieved through birefringence or periodic polarization. Here, we report that the interlayer twist angle in two-dimensional (2D) materials creates a nonlinear geometric phase that can compensate for the phase mismatch, and the vertical assembly of the 2D layers with a proper twist sequence generates a nontrivial "twist-phase-matching"(twist-PM) regime. The twist-PM model provides superior flexibility in the design of optical crystals, which can be applied for twisted layers with either periodic or random thickness distributions. The designed crystal from the twisted rhombohedral boron nitride films within a thickness of only 3.2 μm is capable of producing a second-harmonic generation with conversion efficiency of ∼8% and facile polarization controllability that is absent in conventional crystals. Our methodology establishes a platform for the rational design and atomic manufacturing of nonlinear optical crystals based on abundant 2D materials.Description
Funding Information: We acknowledge Professor Yuen-Ron Shen (University of California, Berkeley) for his valuable suggestions and comments on the twist-phase-matching model and rBN crystals. This work is supported by the National Key R&D Program of China (2022YFA1403500 and 2021YFA1400201), National Natural Science Foundation of China (52025023, 51991342, 12374167, 12104018, 12374167 and 12034003), Guangdong Major Project of Basic and Applied Basic Research (2021B0301030002), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB33000000) and the New Cornerstone Science Foundation through the XPLORER PRIZE. Publisher Copyright: © 2023 American Physical Society.
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Hong, H, Huang, C, Ma, C, Qi, J, Shi, X, Liu, C, Wu, S, Sun, Z, Wang, E & Liu, K 2023, 'Twist Phase Matching in Two-Dimensional Materials', Physical Review Letters, vol. 131, no. 23, 233801. https://doi.org/10.1103/PhysRevLett.131.233801