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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Updated: Sep 30, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Giant two-photon absorption in MXene quantum dots.

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    Ultrasmall niobium carbide quantum dots (Nb2C QDs) exhibit enhanced two-photon absorption (TPA) in the near-infrared, driven by unique electronic transitions. This discovery opens avenues for advanced nonlinear nanophotonics applications.

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    Area of Science:

    • Materials Science
    • Nanophotonics
    • Quantum Dots

    Background:

    • Developing materials with significant nonlinear optical (NLO) properties is crucial for advanced nanophotonics.
    • Ultrasmall quantum dots (QDs) are promising candidates for NLO applications due to their tunable electronic and optical properties.

    Purpose of the Study:

    • To investigate the nonlinear optical (NLO) response of ultrasmall niobium carbide quantum dots (Nb2C QDs).
    • To explore the potential of Nb2C QDs for next-generation nonlinear nanophotonics.

    Main Methods:

    • Experimental observation of two-photon absorption (TPA) in Nb2C QDs across the near-infrared spectrum (1064-1550 nm).
    • Characterization of the nonlinear absorption coefficient at 1064 nm.
    • Investigation of the nonlinear optical response in the visible range (400-800 nm).
    • Validation using Density Functional Theory (DFT) calculations.

    Main Results:

    • Nb2C QDs exhibit an enhanced TPA response at 1064 nm, with a nonlinear absorption coefficient of 0.52 ± 0.05 cm/GW.
    • The TPA is attributed to a two-even-parity states transition, overcoming the forbidden single-photon transition.
    • Nb2C QDs display saturable absorption between 400-800 nm.
    • DFT confirms the mechanism of enhanced TPA via two-even-parity states transition.

    Conclusions:

    • Ultrasmall Nb2C QDs possess a remarkable TPA response at 1064 nm, suitable for nonlinear nanophotonics.
    • The NLO behavior can be tuned by controlling Nb2C QD morphology or surface termination.
    • This work provides insights into the fundamental optical properties of Nb2C QDs and their potential applications.