Fig. 2: Experiments with terahertz spectroscopy. | Nature Communications

Fig. 2: Experiments with terahertz spectroscopy.

From: Temporal loss boundary engineered photonic cavity

Fig. 2

a Temporal profile of probe pulse and its Gabor transform profile indicating the concentration of frequency components within ~5 ps. b SEM image of the metamaterial whose constituents are periodic silicon cylindrical resonators with geometric parameters d = 206 μm, p = 225 μm, and h = 120 μm. c Output temporal profile after transmitting through the cavity showing the long-lasting oscillations for ~100 ps. The Gabor transform reveals the elongated frequency components centered at ~0.6 THz. d The frequency spectrum of the cavity after Fourier transform containing degenerate TE and TM modes that are spatiospectrally inseparable. Mode profiles indicate the transverse electric and transverse magnetic features in the z-cut plane.

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