Measurement of the absolute Raman cross section of the optical phonons in type Ia natural diamond
Measurement of the absolute Raman cross section of the optical phonons in type Ia natural diamond
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DOI：
10.1016/j.ssc.2011.11.005
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发表时间：
2012-02-01
影响因子：
2.1
通讯作者：
Polla, D. L.
中科院分区：
文献类型：
--
作者：
Aggarwal, R. L.;Farrar, L. W.;Polla, D. L.
用785和1064 nm泵浦激光激发拉曼散射，测量了天然金刚石中1332 cm（-1）一级光学声子的绝对拉曼散射截面σ（Rs）。一个小的温度控制的黑体被用于785-和1064-nm的拉曼系统的信号校准。用0.9 mm厚的（111）天然金刚石样品进行测量。在785和1064 nm激发下，每个碳原子的σ（Rs）值分别为2.7 +/- 0.6 x 10（-29）和0.95 +/- 0.2 x 10（-29）cm（2）。拉曼散射效率S的相应值为3.8 +/- 0.8 × 10（-7）和1.3 +/- 0.3 × 10（-2）cm（-1）sr（-1）。785和1064 nm激发的拉曼极化率垂直条和垂直条的值分别为6.8 +/- 0.7 × 10（-16）cm（2）和8.1 +/- 0.8 × 10（-16）cm（2）。我们测量的垂直条d垂直条的值分别大于先前使用514.5和694 nm激发测量的值4.4 +/- 0.3 x 10（-16）和4.6 +/- 0.7 x 10（-16）cm（2）。使用时间依赖密度泛函理论计算1.0 eV（1240 nm）至4.0 eV（310 nm）范围内的垂直条D垂直条与激发光子能量的关系。514.4和694 nm激发的计算值分别为5.8 x 10（-16）和5.3 x 10（-16）cm（2），大于垂直条d垂直条的相应测量值。785和1064 nm激发的计算值分别为5.2 × 10 ~（-16）和5.0 × 10 ~（-16）cm ~（2），小于本工作中测得的相应的垂直条和垂直条。静力极限中的竖向钢筋d竖向钢筋的计算值为4.7 x 10（-16）cm（2）。对于64原子的超原胞计算，由于IaA和IaB缺陷引起的垂直条d垂直条的修正小于5%。(C)2011爱思唯尔有限公司版权所有。
The absolute Raman cross section sigma(Rs) of the first-order 1332-cm(-1) optical phonons in type la natural diamond was measured using 785- and 1064-nm pump lasers for the excitation of Raman scattering. A small temperature-controlled blackbody was used for the signal calibration of the 785- and 1064-nm Raman systems. Measurements were made with a 0.9-mm thick (111) natural diamond sample. Values of 2.7 +/- 0.6 x 10(-29) and 0.95 +/- 0.2 x 10(-29) cm(2) per carbon atom were determined for sigma(Rs) for 785- and 1064-nm excitation, respectively. The corresponding values of the Raman scattering efficiency S are 3.8 +/- 0.8 x 10(-7) and 1.3 +/- 0.3 x 10(-2) cm(-1) sr(-1). The values of the Raman polarizability vertical bar d vertical bar for 785-, and 1064-nm excitation are 6.8 +/- 0.7 x 10(-16) and 8.1 +/- 0.8 x 10(-16) cm(2), respectively. Our measured values of vertical bar d vertical bar are larger than the previously measured values of 4.4 +/- 0.3 x 10(-16) and 4.6 +/- 0.7 x 10(-16) cm(2) using 514.5- and 694-nm excitation, respectively. vertical bar d vertical bar vs. excitation photon energy was computed for the range from 1.0 eV (1240 nm) to 4.0 eV (310 nm) using time-dependent density functional theory. The computed values of 5.8 x 10(-16) and 5.3 x 10(-16) cm(2) for 514.4- and 694-nm excitation, respectively, are larger than the corresponding measured values of vertical bar d vertical bar. The computed values of 5.2 x 10(-16), and 5.0 x 10(-16) cm(2) for 785- and 1064-nm excitation are smaller than the corresponding values of vertical bar d vertical bar measured in this work. The computed value of vertical bar d vertical bar in the static limit is 4.7 x 10(-16) cm(2). Modification of vertical bar d vertical bar due to IaA and IaB defects, computed for a 64-atom supercell, is less than 5%. (C) 2011 Elsevier Ltd. All rights reserved.