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Kunugita H, Hatashita K, Ohkubo Y, et al. Observation of coherent phonon-plasma coupled modes in wide gap semiconductors by transmission pump-probe measurements. Opt Express. 2015;23(15):19705-14doi: 10.1364/OE.23.019705.
Kunugita, H., Hatashita, K., Ohkubo, Y., Okada, T., & Ema, K. (2015). Observation of coherent phonon-plasma coupled modes in wide gap semiconductors by transmission pump-probe measurements. Optics express, 23(15), 19705-14. https://doi.org/10.1364/OE.23.019705
Kunugita, Hideyuki, et al. "Observation of coherent phonon-plasma coupled modes in wide gap semiconductors by transmission pump-probe measurements." Optics express vol. 23,15 (2015): 19705-14. doi: https://doi.org/10.1364/OE.23.019705
Kunugita H, Hatashita K, Ohkubo Y, Okada T, Ema K. Observation of coherent phonon-plasma coupled modes in wide gap semiconductors by transmission pump-probe measurements. Opt Express. 2015 Jul 27;23(15):19705-14. doi: 10.1364/OE.23.019705. PMID: 26367628.
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Opt Express. 2015 Jul 27;23(15):19705-14. doi: 10.1364/OE.23.019705.

Observation of coherent phonon-plasma coupled modes in wide gap semiconductors by transmission pump-probe measurements.

Optics express

Hideyuki Kunugita, Kanji Hatashita, Yuji Ohkubo, Takashi Okada, Kazuhiro Ema

PMID: 26367628 DOI: 10.1364/OE.23.019705

Abstract

We have investigated coherent LO phonon properties in zinc-based II-VI widegap semiconductors, focusing on phonon-plasma coupled modes. By a careful treatment of the time evolution of the signals in ZnS, ZnSe, and ZnTe, we found a frequency upshift as the pump intensity increases. Using a classical coupled oscillator model, we have explained the pump intensity dependence of both the shift and the decay rates by a mixing of highly damped two-photon generated plasma. From the linear dependence between them we can estimate the photo-excited carrier mobilities, leading to a new powerful estimation method to measure the mobility.

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