论文标题
Crystalline BI $ _2 $ SR $ _2 $ CACU $ _2 $ o $ _ {8+δ} $的光学常数
Optical Constants of Crystalline Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ by Brillouin Light Scattering Spectroscopy
论文作者
论文摘要
Crystalline BI $ _2 $ SR $ _2 $ CACU $ _2 $ o $ $ _ {8+δ} $的室温光学常数是使用从Brillouin Light Sctifting Spattra提取的数据确定的。在波长为532 nm处的光学灭绝系数到反射指数比率是从散装声子峰宽度和频移测量值和频率移位测量值，范围从$ 0.19 \ leq2κ/N \ leq 0.29 $，对于接近晶体学$ C $ C $ C $ -Axis的方向。这些比率，光学灭绝系数，吸收系数以及从这些比率和已知折射率确定的介电函数的假想部分与光学反射研究中发现的值一般一致，但比从光学干扰测量中提取的比值高5-7倍。
Room-temperature optical constants of crystalline Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ were determined using data extracted from Brillouin light scattering spectra. Optical extinction coefficient-to-refractive index ratios at a wavelength of 532 nm were obtained from bulk phonon peak linewidth and frequency shift measurements and range from $0.19 \leq 2κ/n \leq 0.29$ for directions close to the crystallographic $c$-axis. These ratios, and optical extinction coefficients, absorption coefficients, and imaginary parts of the dielectric function determined from these ratios and known refractive index, are in general agreement with values found in optical reflectance studies, but are 5-7 times larger than those extracted from optical interference measurements.
