Excitation of second harmonic terahertz surface magnetoplasmons over a rippled surface of n-InSb

Abstract

We analyzed the excitation of second harmonic (SH) terahertz (THz) surface magnetoplasmons (SMPs) over a n-type semiconductor (n-InSb)-free space interface. P-polarized laser obliquely incidents on the magnetized rippled surface of semiconductor with frequency ω and wave number k0z and k0x and exerts a ponderomotive force on free electrons of semiconductor surface and imparts second harmonic oscillatory velocity v→2ω. Second harmonic oscillatory velocity v→2ω couples with modulated electron density nq of rippled surface to produce a second harmonic nonlinear current J→2ωnl, which resonantly derives SH THz SMPs with wave number k2z=2k0z+q and frequency 2ω. SH THz SMPs amplitude increases with applied external magnetic field as well as with incident angle and gets the maximum value then decreases further increase in the applied external magnetic field and incident angle. The conversion efficiency of SH THz SMPs amplitude is achieved up to 4.2%.

Keywords

• TeraHertz
• Surface magneto plasmon
• Ponderomotive force