Journal
OPTICS LETTERS
Volume 35, Issue 21, Pages 3544-3546Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.003544
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Funding
- National Science Foundation (NSF) [0333314]
- Office of Naval Research (ONR)
- Defense Threat Reduction Agency
- Department of Homeland Security through the DHS-ALERT Center [2008-ST-061-ED0001]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1237615, 0852728] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0923353] Funding Source: National Science Foundation
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Laser-induced plasma acoustic waves are enhanced under the illumination of single-cycle terahertz (THz) radiation, making THz-enhanced acoustics (TEA) a useful method for THz wave detection. During a single-cycle THz pulse with its peak field of 100 kV/cm, a pressure enhancement of 10% is observed throughout the acoustic spectrum up to 140 kHz, and the TEA signal is found to increase linearly with THz wave intensity. By using dual-color laser excitation to manipulate free electron drift, it is possible to modulate the enhanced acoustic signal and recover a coherent THz time-domain waveform by simply listening to the plasma. (C) 2010 Optical Society of America
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