【摘 要】
：
A hypothesis is brought forward that the materials with low propagation loss in both optical and microwave band may exhibit good performance in terahertz (THz)
【机 构】
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State Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science
论文部分内容阅读
A hypothesis is brought forward that the materials with low propagation loss in both optical and microwave band may exhibit good performance in terahertz (THz) band because THz wave band interspaces those two wavebands. For the purpose of exploring a kind of low-loss material for THz waveguide, Lu2.1Bio.9FesO12(LuBiIG)gaet films are prepared by liquid phase epitaxy (LPE) method on a gadolinium gallium gaet (GGG) substrate from lead-free flux because of the good properties in both optical and microwave bands. In microwave band, the ferromagnetic resonance (FMR) linewidth of the film 2△H = 2.8-5.1 Oe; in optical band, the optical absorption coefficient is 600cm-1 at visible range and about 100-170cm-l when the wavelength is longer than 80Onm. In THz range, our hypothesis is well confirmed by a THz-TDS measurement which shows that the absorbance of the film for THz wave is 0.05-0.3 cm- 1 and the minimum value appears at 2.3 THz. This artificial ferromagnetic material holds a great promise for magnetic field tunable THz devices such as wavegnide, modulator or switch.
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