[7p-N401-1~16] 13.6 Nanostructures, quantum phenomena, and nano quantum devices

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[7p-N401-3] Effects of free carriers on difference-frequency-mixing signal under exciton resonant excitation condition in a GaAs/AlAs multiple quantum well

〇Jiaming Xu¹, Osamu Kojima¹, Matthew Steer², Richard Hogg^2,3 (1.Chiba Inst. Tech., 2.Univ. Glasgow, 3.Aston Univ.)

Keywords:

exciton,difference-frequency-mixing,GaAs/AlAs multiple quantum well

To increase terahertz-wave intensity due to difference-frequency-mixing in a GaAs/AlAs multiple qunatum well, we focused on free carrier generation caused by excitation using continuous wave lasers. By modulation of laser lights with optical chopper to cut the lights faster than that to detect the signal, the signal intensity increases. This results from supression of the free carrier generation due to exciton ionization.