High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

Wen, Haidan; Daranciang, Dan; Lindenberg, Aaron M.

doi:10.1063/1.3407514

Cited by 23 publications

(15 citation statements)

References 41 publications

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“…The polarization of THz emission may rotate due to the relative phase shift between the fundamental and the second harmonic waves caused by the preformed plasma. In the case of Wen et al's experiment [28], actually the main cause of the suppression of the THz emission from the main pulse was the polarization rotation. However, the main part of the response recovers within a very short time (30 ps or so), while we observed only a slow response (≈200 ps).…”

Section: Resultsmentioning

confidence: 93%

Effect of preformed plasma on terahertz-wave emission from the plasma generated by two-color laser pulses

2011

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We introduced a weak prepulse 0-2 ns before the main pulse in the formation of a terahertz (THz) wave in air plasma by laser pulses composed of fundamental and second-harmonic waves. The prepulse suppressed the THz wave generated by the main pulse. We analyzed the suppression factor as a function of the time interval between the prepulse and the main pulse and found that the THz wave from the main pulse decreases immediately after the prepulse, recovers partially within several hundred picoseconds, and then recovers slowly. This suppression is attributed to the dense plasma, which absorbs and screens the generated THz wave, since the relaxation time is close to the lifetime of the fluorescence from the plasma. The results support the idea that the major mechanism of THz wave generation is explained by the plasma current model.

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Section: Resultsmentioning

confidence: 93%

Effect of preformed plasma on terahertz-wave emission from the plasma generated by two-color laser pulses

2011

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“…Xu et al used two single-color pulses, where the THz wave generation mechanism is pondermotive force, and reported the enhancement of THz wave generation. Wen et al reported high-speed THz wave polarization switching using two sets of two-color optical excitation at the fundamental and second harmonic frequency [14]. Effects of the interaction of two laser-induced plasmas were reported by Manceau et al [15].…”

Section: Introductionmentioning

confidence: 96%

Terahertz wave excitation from preexisting air plasma

Das

Yamaguchi

2013

J. Opt. Soc. Am. B

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Terahertz (THz) wave generation process in air plasma was studied using femtosecond laser pulse pairs. The effect of preexisting air plasma was investigated using two optical geometries: collinear and orthogonal pumping geometry. When the air plasma is excited in collinear geometry, the power of the generated THz wave shows asymmetric dependence on the relative delay of these pulses. The asymmetry depends on the relative intensities of these pump pulses, and it disappears when the pulses have equal intensities. In the orthogonal pumping geometry, the power of the THZ wave generated by the main pump pulse decreases in the presence of the preexisting plasma generated by the prepulse, and it recovers as the relative delay between the prepulse and main pulses becomes longer. Possible mechanisms of the results are discussed in terms of the dynamics of free electrons in the air plasma.

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“…The THz transmission measurements were performed with a 1 kHz amplified Ti:sapphire femtosecond laser system employing a plasma THz generation scheme and an electrooptic sampling detection scheme. [15][16][17] The optical pump and THz probe beams were collinear at normal incidence. Fig.…”

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confidence: 99%

Ultrafast sub-threshold photo-induced response in crystalline and amorphous GeSbTe thin films

Shu

Chatzakis

Kuo

et al. 2013

Applied Physics Letters

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Pump-probe optical reflectivity and terahertz transmission measurements have been used to investigate time resolved sub-threshold photo-induced effects in crystalline and amorphous GeSbTe films at MHz repetition rates. The reflectivity in both phases exhibits long-lived modulations consistent with the sign of the changes that occur upon switching but of smaller magnitude. These can be understood by the generation of acoustic strains with the crystalline phase response dominated by thermal effects and the amorphous phase response associated with electronically induced changes. Evidence for a photo-induced distortion is observed in the amorphous phase which develops homogeneously within the excited region on few-picosecond time scales.

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High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

Cited by 23 publications

References 41 publications

Effect of preformed plasma on terahertz-wave emission from the plasma generated by two-color laser pulses

Effect of preformed plasma on terahertz-wave emission from the plasma generated by two-color laser pulses

Terahertz wave excitation from preexisting air plasma

Ultrafast sub-threshold photo-induced response in crystalline and amorphous GeSbTe thin films

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