论文信息 - Observation of strong and broadband terahertz induced electroabsorption in multiple quantum wells

Observation of strong and broadband terahertz induced electroabsorption in multiple quantum wells

We report the observation of strong terahertz-induced electroabsoption (EA) modulation in in multiple double quantum well (MDQW) structures Broadband terahertz generated by two-color laser induced plasma is focused (~1MV/cm) onto the MQW and spectro-temporal response is probed in transmission geometry, where up to 60% modulation signals are observed. EAS signal is attributed to several mechanisms, including observed qualitative agreement with the two-dimensional Franz-Keldysh response. Utilizing strong EA signals, we present a simple THz imaging scheme using conventional imagers.

[1] K. Y. Kim,et al. Off-axis phase-matched terahertz emission from two-color laser-induced plasma filaments. , 2012, Physical review letters.

[2] Hartmut G. Roskos,et al. Efficient Terahertz Pulse Generation in Laser-Induced Gas Plasmas , 2005 .

[3] Ki-Yong Kim,et al. Generation of coherent terahertz radiation in ultrafast laser-gas interactionsa) , 2009 .

[4] Mansoor Sheik-Bahae,et al. Air-breakdown coherent detection of terahertz using controlled optical bias , 2013, OPTO.

[5] John D. Dow,et al. Theory of electroabsorption by anisotropic and layered semiconductors. I. Two-dimensional excitons in a uniform electric field , 1976 .

[6] Xu Xie,et al. Coherent control of THz wave generation in ambient air. , 2006, Physical review letters.