本研究ではテラヘルツ時間領域分光法(THz-TDS)及び遠赤外吸収スペクトル法(FIR)を用いてEOポリマーの線形の誘電特性について調べた。低いTHz周波数領域(~0.1 THz)での誘電特性は、超高速電気光学変調(~100 GHz)に対する直接的で重要な情報を与える。一方広いTHz周波数領域での誘電特性はEOポリマーのTHz発生・検出への応用に対して、基本的な情報与える。EOポリマーは光波と広いTHz周波数域における屈折率の差が小さいことが明らかになった。

We investigated the dielectric properties of electro-optic polymers in a THz frequency region (90 GHz to 4 THz) by using terahertz time domain spectroscopy. The absorption coefficient in a broader frequency region of up to 20 THz is obtained through the use of far-infrared spectroscopy. We studied a new methacrylate polymer with a high hyperpolarizability chromophore as the side-chain,, a side-chain copolymer Disperse Red 1-poly(methyl methacrylate),, and pure poly(methyl methacrylate). The dielectric properties in the low THz frequency region (~0.1 THz) provide us with important information about the intrinsic refractive index for ultra-high speed electro-optic modulation (~100 GHz) as well 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 the side-chain electro-optic polymers within THz generation and detection.