Please use this identifier to cite or link to this item: https://doi.org/10.1515/nanoph-2020-0266
Title: Role of hot electron scattering in epsilon-near-zero optical nonlinearity
Authors: Mei, T.
Wang, H.
Du, K.
Dai, X.
Zhang, W.
Liu, R.
Chua, S.J. 
Keywords: Electron scattering
Epsilon-near-zero
Free electron optical nonlinearity
Intraband transition
Issue Date: 2020
Publisher: De Gruyter Open Ltd
Citation: Mei, T., Wang, H., Du, K., Dai, X., Zhang, W., Liu, R., Chua, S.J. (2020). Role of hot electron scattering in epsilon-near-zero optical nonlinearity. Nanophotonics 9 (14) : 4287-4293. ScholarBank@NUS Repository. https://doi.org/10.1515/nanoph-2020-0266
Abstract: The physical origin of epsilon-near-zero (ENZ) optical nonlinearity lies in the hot-electron dynamics, in which electron scattering plays an important role. With the damping factor defined by hot electron scattering time, the Drude model could be extended to modeling ENZ optical nonlinearity completely. We proposed a statistical electron scattering model that takes into account the effect of electron distribution in a nonparabolic band and conducted the investigation on indium tin oxide (ITO) with femtosecond-pump continuum-probe experiment. We found that ionized impurity scattering and acoustic phonon scattering are the two major scattering mechanisms, of which the latter had been neglected before. They dominate at low-energy and high-energy electrons, respectively, and are weakened or boosted for high electron temperature, respectively. The electron energy-dependent scattering time contributed from multiple scattering mechanisms shows the electron density-dependent damping factor. The comprehensive understanding of electron scattering in ITO will help to develop a complete model of ENZ optical nonlinearity. © 2020 Heng Wang et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License.
Source Title: Nanophotonics
URI: https://scholarbank.nus.edu.sg/handle/10635/197460
ISSN: 21928614
DOI: 10.1515/nanoph-2020-0266
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