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2014•Unpublished venueRequires access

Excitation of coherent phonons in GaAs by broadband THz pulses

Zhengping Fu, Masashi Yamaguchi

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Abstract

In this paper, we present coherent excitation of optical phonons with broadband THz pulses from laser induced plasma. GaAs wafer was excited with a single and double THz pulses, and detected with optical probe. In addition to infrared active TO phonons, we have observed oscillation at the frequency of LO phonons, we identified as upper branch of phononpolaritons.

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What this paper is about

In this paper, we present coherent excitation of optical phonons with broadband THz pulses from laser induced plasma. GaAs wafer was excited with a single and double THz pulses, and detected with optical probe. In addition to infrared active TO phonons, we have observed oscillation at the frequency of LO phonons, we identified as upper branch of phononpolaritons.

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Available abstract

In this paper, we present coherent excitation of optical phonons with broadband THz pulses from laser induced plasma. GaAs wafer was excited with a single and double THz pulses, and detected with optical probe. In addition to infrared active TO phonons, we have observed oscillation at the frequency of LO phonons, we identified as upper branch of phononpolaritons.

Key concepts: Terahertz radiation, Phonon, Excitation, Laser, Excited state, Optoelectronics, Broadband, Oscillation (cell signaling)

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