Abstract-Monte Carlo simulation of near-field terahertz emission from semiconductors

S. C. Corzo-Garcia, A. I. Hernandez-Serrano, E. Castro-Camus, and O. Mitrofanov

Phys. Rev. B 94, 045301 – Published 1 July 2016

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.045301

We simulated the carrier dynamics in InGaAs after ultrafast photoexcitation. By using a finite-difference time-domain approach we were able to analyze the near terahertz field emission caused by the motion of such carriers. We found that both the current parallel and normal to the interface take a relevant role in the terahertz emission. We also found that the ballistic motion of the carriers after photoexcitation dominates the emission rather than diffusion.

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Abstract-Monte Carlo analysis of the terahertz difference frequency generation susceptibility in quantum cascade laser structures

Monte Carlo analysis of the terahertz difference frequency generation susceptibility in quantum cascade laser structures Christian Jirauschek, Hesham Okeil, and Paolo Lugli  »View Author Affiliations

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-2-1670

Optics Express, Vol. 23, Issue 2, pp. 1670-1678 (2015)
http://dx.doi.org/10.1364/OE.23.001670

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Based on self-consistent ensemble Monte Carlo simulations coupled to the optical field dynamics, we investigate the giant nonlinear susceptibility giving rise to terahertz difference frequency generation in quantum cascade laser structures. Specifically, the dependence on temperature, bias voltage and frequency is considered. It is shown that the optical nonlinearity is temperature insensitive and covers a broad spectral range, as required for widely tunable room temperature terahertz sources. The obtained results are consistent with available experimental data.

© 2015 Optical Society of America