High-harmonic generation from an epsilon-near-zero material

Yang, Yuanmu; Lu, Jian; Manjavacas, Alejandro; Luk, Ting S.; Liu, Hanzhe; Kelley, Kyle; Maria, Jon -Paul; Runnerstrom, Evan L.; Sinclair, Michael B.; Ghimire, Shambhu; Brener, Igal

doi:10.1038/s41567-019-0584-7

High-harmonic generation from an epsilon-near-zero material

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Nature Physics

DOI:https://doi.org/10.1038/s41567-019-0584-7· OSTI ID:1544801

^[1]; ^[2]; ^[3]; Luk, Ting S. ^[4]; ^[2]; Kelley, Kyle ^[5]; Maria, Jon -Paul ^[5]; ^[5]; Sinclair, Michael B. ^[4]; ^[2]; ^[4]

Tsinghua Univ., Beijing (China)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of New Mexico, Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
North Carolina State Univ., Raleigh, NC (United States)

High-harmonic generation (HHG) is a signature optical phenomenon of strongly driven, nonlinear optical systems. Specifically, the understanding of the HHG process in rare gases has played a key role in the development of attosecond science. Recently, HHG has also been reported in solids, providing novel opportunities such as controlling strong-field and attosecond processes in dense optical media down to the nanoscale. Here, we report HHG from a low-loss, indium-doped cadmium oxide thin film by leveraging the epsilon-near-zero (ENZ) effect, whereby the real part of the material’s permittivity in certain spectral ranges vanishes, as well as the associated large resonant enhancement of the driving laser field. We find that ENZ-assisted harmonics exhibit a pronounced spectral redshift as well as linewidth broadening, resulting from the photo induced electron heating and the consequent time-dependent ENZ wavelength of the material. Furthermore, our results provide a new platform to study strong-field and ultrafast electron dynamics in ENZ materials, reveal new degrees of freedom for spectral and temporal control of HHG, and open up the possibilities of compact solid-state attosecond light sources.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1544801

Report Number(s):: SAND--2019-8250J; 677498

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 10 Vol. 15; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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