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NONLINEAR OPTICS

Harmonic generation in confinement

Nature Physics volume 18, pages 855–856 (2022)Cite this article

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Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.

Intense electromagnetic radiation drives extreme nonlinear optical phenomena in matter, such as high-order harmonic generation (HHG)1. Although the three-step process involved in HHG from gases is well-understood, the exact mechanism behind HHG in solids has proven more elusive. Particularly the role of interband and intraband transitions and their interaction still need to be detangled, which would also allow the enhancement and control of HHG. Now, writing in Nature Physics, Kotaro Nakagawa and co-workers have utilized quantum confinement effects to engineer their target material and hence tease out the fundamental processes and their roles in the generation and enhancement of HHG2.

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Fig. 1: High-order harmonic generation in quantum dots.

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Authors and Affiliations

  1. Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Japan

    Julien Madéo & Keshav M. Dani

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  1. Julien Madéo
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  2. Keshav M. Dani
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Correspondence to Julien Madéo.

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The authors declare no competing interests.

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Madéo, J., Dani, K.M. Harmonic generation in confinement. Nat. Phys. 18, 855–856 (2022). https://doi.org/10.1038/s41567-022-01650-8

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