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High-harmonic generation from an epsilon-near-zero material (Conference Presentation)
Author(s): Yuanmu Yang; Jian Lu; Alejandro Manjavacas; Ting Shan Luk; Hanzhe Liu; Kyle Kelley; Jon-Paul Maria; Michael Sinclair; Evan Runnerstrom; Shambhu Ghimire; Igal Brener

Paper Abstract

High-harmonic generation (HHG) has been used to generate extreme ultra-violet (EUV) light sources to probe fast electron dynamics in the attosecond time scale. While traditionally observed in rare-gas atoms, HHG has also recently been reported in solids, with reduced threshold pump field and the additional advantage of producing stable EUV waveforms in a compact setup. Unfortunately, above-band-gap absorption restricts the HHG process to a very thin layer of the solid-state material (typically tens of nanometers in thickness), significantly limiting the generation efficiency. Here, we use a material operating in its epsilon-near-zero (ENZ) region, where the real part of its permittivity vanishes, to greatly boost the efficiency of the HHG process at the microscopic level. In experiments, we report high-harmonic emission up to the 9th order directly from a low-loss, solid-state ENZ medium: indium-doped cadmium oxide, with an excitation intensity at the GW cm-2 level. Furthermore, the observed HHG signal exhibits a pronounced spectral red-shift as well as linewidth broadening, resulting from the photo-induced electron heating and the consequent time-dependent resonant frequency of the ENZ film. Our results provide a novel nanophotonic platform for strong field physics, reveal new degrees of freedom for spectral and temporal control of HHG, and open up possibilities of compact solid-state attosecond light sources

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 110800D (9 September 2019); doi: 10.1117/12.2537655
Show Author Affiliations
Yuanmu Yang, Tsinghua Univ. (China)
Jian Lu, SLAC National Lab. (United States)
Alejandro Manjavacas, Univ. of New Mexico (United States)
Ting Shan Luk, Sandia National Labs. (United States)
Hanzhe Liu, SLAC National Lab. (United States)
Kyle Kelley, North Carolina Central Univ. (United States)
Jon-Paul Maria, North Carolina Central Univ. (United States)
Michael Sinclair, Sandia National Labs. (United States)
Evan Runnerstrom, North Carolina Central Univ. (United States)
Shambhu Ghimire, SLAC National Lab. (United States)
Igal Brener, Sandia National Labs. (United States)


Published in SPIE Proceedings Vol. 11080:
Metamaterials, Metadevices, and Metasystems 2019
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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