Quasi-phase-matched up- and down-conversion in periodically poled layered semiconductors
arxiv(2023)
摘要
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 1.2μm, 10-100× 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.
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