| Autor: |
Trovatello, Chiara, Ferrante, Carino, Yang, Birui, Bajo, Josip, Braun, Benjamin, Xu, Xinyi, Peng, Zhi Hao, Jenke, Philipp K., Ye, Andrew, Delor, Milan, Basov, D. N., Park, Jiwoong, Walther, Philip, Rozema, Lee A., Dean, Cory, Marini, Andrea, Cerullo, Giulio, Schuck, P. James |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
Nonlinear optics lies at the heart of classical and quantum light generation. The invention of periodic poling revolutionized nonlinear optics and its commercial applications by enabling robust quasi-phase-matching in crystals such as lithium niobate. However, reaching useful frequency conversion efficiencies requires macroscopic dimensions, limiting further technology development and integration. Here we realize a periodically poled van der Waals semiconductor (3R-MoS$_2$). Due to its exceptional nonlinearity, we achieve macroscopic frequency conversion efficiency over a microscopic thickness of only 1.2${\mu}$m, $10-100\times$ thinner than current systems with similar performances. Due to unique intrinsic cavity effects, the thickness-dependent quasi-phase-matched second harmonic signal surpasses the usual quadratic enhancement by $50\%$. Further, we report the broadband generation of photon pairs at telecom wavelengths via quasi-phase-matched spontaneous parametric down-conversion. This work opens the new and unexplored field of phase-matched nonlinear optics with microscopic van der Waals crystals, unlocking applications that require simple, ultra-compact technologies such as on-chip entangled photon-pair sources for integrated quantum circuitry and sensing. |
| Databáze: |
arXiv |
| Externí odkaz: |
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