Boosting classical and quantum nonlinear processes in ultrathin van der Waals materials

• URL: http://arxiv.org/abs/2503.23075v1
• Date: Sat, 29 Mar 2025 13:24:55 GMT
• Title: Boosting classical and quantum nonlinear processes in ultrathin van der Waals materials
• Abstract summary: We report a giant boost of classical and quantum nonlinear processes in ultrathin van der Waals materials.<n>Specifically, with a metal-nonlinear material heterostructure we enhance classical second-harmonic generation in h-BN flakes by two-orders of magnitude.
• Score: 32.30884133290746
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Understanding and controlling nonlinear processes is crucial for engineering light-matter interaction and generating non-classical light. A significant challenge in ultra-thin nonlinear materials is the marked diminution of the nonlinear conversion efficiency due to the reduced light-matter interaction length and, in many cases, the centrosymmetric crystalline structures. Here we relax these limitations and report a giant boost of classical and quantum nonlinear processes in ultrathin van der Waals materials. Specifically, with a metal-nonlinear material heterostructure we enhance classical second-harmonic generation in h-BN flakes by two-orders of magnitude. Moreover, we have engineered a metal-SiO2-nonlinear material heterostructure resulting in a remarkable two orders of magnitude augmentation of the quantum spontaneous parametric down-conversion (SPDC) in NbOCl2 flakes. Notably, we demonstrate SPDC in a 16 nm-thick NbOCl2 flake integrated into the proposed structure. These findings simplify on-chip quantum state engineering and accelerate the use of van der Waals materials in nonlinear optoelectronics.

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