Massachusetts Institute of Technology

Yaqing Zhang

Keith Adam Nelson

Harold Young Hwang

Benjamin K Ofori-Okai

Jian Lu

Xian Li

A nonlinear terahertz (THz) spectroscopy technique uses a sample illuminated by two THz pulses separately. The illumination generates two signals Band B, corresponding to the first and second THz pulse, respectively, after interaction with the sample. The interaction includes excitation of at least one ESR transition in the sample. The sample is also illuminated by the two THz pulses together, with an inter-pulse delay &#x3c4;, generating a third signal B. A nonlinear signal BNL is then derived via B=B&#x2212;B&#x2212;B. This nonlinear signal Bcan be then processed (e.g., Fourier transform) to study the properties of the sample.

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Yaqing Zhang