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• W2963296514 abstract "Abstract Optical parametric oscillators are widely used as pulsed and continuous-wave tunable sources for innumerable applications, such as quantum technologies, imaging, and biophysics. A key drawback is material dispersion, which imposes a phase-matching condition that generally entails a complex design and setup, thus hindering tunability and miniaturization. Here we show that the burden of phase-matching is surprisingly absent in parametric micro-resonators utilizing mono-layer transition-metal dichalcogenides as quadratic nonlinear materials. By the exact solution of nonlinear Maxwell equations and first-principle calculations of the semiconductor nonlinear response, we devise a novel kind of phase-matching-free miniaturized parametric oscillator operating at conventional pump intensities. We find that different two-dimensional semiconductors yield degenerate and non-degenerate emission at various spectral regions due to doubly resonant mode excitation, which can be tuned by varying the incidence angle of the external pump laser. In addition, we show that high-frequency electrical modulation can be achieved by doping via electrical gating, which can be used to efficiently shift the threshold for parametric oscillation. Our results pave the way for the realization of novel ultra-fast tunable micron-sized sources of entangled photons—a key device underpinning any quantum protocol. Highly miniaturized optical parametric oscillators may also be employed in lab-on-chip technologies for biophysics, detection of environmental pollution and security." @default.
• W2963296514 created "2019-07-30" @default.
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• W2963296514 date "2018-05-18" @default.
• W2963296514 modified "2023-10-14" @default.
• W2963296514 title "Phase-matching-free parametric oscillators based on two-dimensional semiconductors" @default.
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• W2963296514 doi "https://doi.org/10.1038/s41377-018-0011-3" @default.
• W2963296514 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6107017" @default.
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