THz Detection

Articles on terahertz detection techniques, electro-optic sampling, nonlinear crystals, polarization-sensitive detection, and THz time-domain measurements.

Fourier Transform of Signals: Theory, Computation and Physical Interpretation

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1. From a Measured Signal to Its Frequency Components A signal is normally recorded as a quantity that changes with time. Examples include an electrical voltage $V(t)$, acoustic pressure $P(t)$, optical intensity $I(t)$, or a terahertz electric field $E(t)$. In a THz time-domain experiment, the detector directly provides a sequence of electric-field values measured at … Read more

Spatio-Temporal Evolution of the Terahertz Electric Field

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1. Physical Concept of a Spatio-Temporal THz Field The complete description of a broadband terahertz pulse is not simply its temporal waveform $E(t)$, spectrum $E(f)$, or transverse beam profile $E(x,y)$, but the full spatio-temporal electric field $E(x,y,t)$. This quantity describes the instantaneous THz electric field at every transverse position $(x,y)$ and at every time $t$. … Read more