Ab-initio Calculation of Nonlinear Optical Susceptibilities in Germanium Quantum Dots

被引：0

作者：

Islam, Shadli ^{[1
]}

Shah, Harsh ^{[1
]}

Shiri, Daryoush ^{[2
]}

Nekovei, Reza ^{[1
]}

Verma, Amit ^{[1
]}

机构：

[1] Texas A&M Univ Kingsville, Dept Elect Engn & Comp Sci, Kingsville, TX 78363 USA

[2] Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden

来源：

2018 IEEE 13TH NANOTECHNOLOGY MATERIALS AND DEVICES CONFERENCE (NMDC) | 2018年

关键词：

Germanium; Quantum Dots; nonlinear optics; second order susceptibility; DFT; SIESTA (R); REFLECTANCE ANISOTROPY;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Using Time Independent Density Functional Theory (TIDFT) implemented in SIESTA (R) we calculated the 2nd order and 3rd order nonlinear optical susceptibilities of small Germanium Quantum Dots (GeQD). We observe that the symmetry breaking due to surface termination enhances chi((2)) up to 299.1 pm/V which promises a strong Second Harmonic Generation (SHG) in GeQDs. Diagonal components for chi((2)) tensor are 52.5, 11.2, 299.1 pm/V, for xxx, yyy and zzz, respectively. The 3rd order susceptibility, chi((3)), is within the range of (0.2-0.4) x 10(-18) m(2)/V-2 which is close to the reported experimental values of bulk Germanium. This study suggests possibilities of enhancing SHG in GeQDs through symmetry breaking via strain and surface termination/reconstruction as well as suitability of this fast and less-computationally intensive Density Functional Theory (DFT)-based method in predicting nonlinear optical susceptibilities of nano structures.

引用

页码：113 / 116

页数：4

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