期刊
JOURNAL OF PHYSICAL SCIENCE
卷 30, 期 3, 页码 117-129出版社
UNIV SAINS MALAYSIA
DOI: 10.21315/jps2019.30.3.8
关键词
Nematic liquid crystal; 5CB; 1DPS; omnidirectional reflection band; DFT
资金
- Babasaheb Bhimrao Ambedkar University, India through Non-NET University Grants Commission (UGC) fellowship
- UGC, New Delhi
In this paper, an omnidirectional reflection band of a one-dimensional periodic structure (1DPS) of Si and SiO2 with a nematic liquid crystal (5CB) as a defect layer, i.e., (Si vertical bar SiO2)(3)vertical bar NLC vertical bar(Si vertical bar SiO2)(3), is investigated. The geometry of the 5CB molecules NLC is optimised with the help of density functional theory (DFT) using Gaussian 09 Software packageA02 and the order parameter (S) of the 5CB molecules is calculated. The S value for the 5CB molecules is found to be 0.53 for the range of the applied electric field and confirms the nematic phase of the liquid crystal at the microwave region. By taking average of the ordinary and extraordinary refractive indices of the 5CB molecules NLC, the refractive index has been calculated. The optical properties of the 1DPS of Si and SiO2 with a 5CB molecules NLC defect layer are calculated to study the optical defect mode as well as the bi-channelled omnidirectional reflection behaviour of the 1DPS (Si vertical bar SiO2)(3)|NLC vertical bar(Si|vertical bar SiO2)(3) and tuned by the electro-optic property of 5CB NLC. Such omnidirectional reflecting behaviour of the considered structure may be used to design b-channelled omnidirectional reflector and defect mode filter and others.
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