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Erschienen in:
01.02.2023
Excitation of terahertz surface magnetoplasmons by nonlinear mixing of laser and its second harmonic on a rippled surface of n type semiconductor
Erschienen in: Optical and Quantum Electronics | Ausgabe 2/2023
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Abstract
We investigated the excitation of terahertz (THz) surface magneto plasmons (SMPs) by nonlinear mixing of laser and its second harmonic on a rippled surface of n-type semiconductor-free space interface. Obliquely incident p-polarized lasers exert a nonlinear ponderomotive force on free electrons of n-type semiconductor. Nonlinear ponderomotive force induces the oscillatory velocities at frequencies \(2\omega _{1}\) and (\(\omega _{1}-\omega _{2}\)). These oscillatory velocities beat the modulated electron density \(n_{q}\) to get the charge density perturbation at (\(2\omega _{1}, 2k_{1z}+q\)) and (\(\omega _{1}-\omega _{2}, k_{1z}-k_{2z}+q\)). Perturbed charge density couples with the linear oscillatory velocities to produce a nonlinear current density, which resonantly derives THz SMPs at frequency \(\omega =2\omega _{1}-\omega _{2}\) and propagation constant \(k_{z}=2k_{1z}-k_{2z}+q\). Here, q provides the extra wave number for the phase matching condition. The efficiency of THz SMPs wave amplitude was attained up to \(9\%\) and THz SMPs wave amplitude controlled by the electron cyclotron frequency \(\omega _{ce}\) and incident angle \(\theta\).