Selected polymers on CW and pulsed THz investigations

We investigated the dielectric properties of side-chain electro-optic polymers in a broad THz frequency region (90 GHz to 7 THz). For this investigation, we used terahertz time domain spectroscopy and the absorption coefficient in a broader frequency region of up to 20 THz that was obtained by far-infrared spectroscopy. The polymers studied were a new methacrylate polymer with a high-hyperpolarizability chromophore as the sidechain, a side-chain copolymer Disperse Red 1 polymethylmethacrylate, and pure polymethylmethacrylate. The dielectric properties in the low THz frequency region (∼0.1 THz) provide us with important information about the intrinsic refractive index for ultrahigh-speed electro-optic modulation (∼100 GHz), as well as versatile information such as the absorption coefficient and dielectric loss. The THz and far-infrared spectroscopic data in the wide frequency region provide us with the fundamental data for applications of side-chain electro-optic polymers within THz generation and detection.

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“…2(c) tends to decrease slightly when the frequency increases, our data is more consistent with the data in Ref. 27. Looking at the data in Figs.…”

Section: Resultssupporting

confidence: 92%

“…It has been reported that the refractive index at around 250 GHz for PMMA is about 1.6 or a little larger than 1.6, 13,26) and the refractive index at 200 GHz for PMMA is 1.474. 27) Because the refractive index of pure PMMA in Fig. 2(c) tends to decrease slightly when the frequency increases, our data is more consistent with the data in Ref.…”

Section: Resultssupporting

confidence: 91%