Optical spectra of composite silver-porous silicon (Ag-pSi) nanostructure based periodical lattice

Numerical finite differential time domain (FDTD) tools were used in this study for predicting the optical characteristics through the nanostructure of composite silver-porous silicon (Ag-pSi) based periodical lattice. This is aimed at providing an interpretation of the optical spectra at known poros...

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Bibliographic Details
Published in:Superlattices and microstructures 2018-03, Vol.115, p.168-176
Main Authors: Amedome Min-Dianey, Kossi Aniya, Zhang, Hao-Chun, Brohi, Ali Anwar, Yu, Haiyan, Xia, Xinlin
Format: Article
Language:English
Subjects:
FDTD lumerical solutions
Optical spectra
Periodical lattice
Porous silicon
Silver
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Summary:Numerical finite differential time domain (FDTD) tools were used in this study for predicting the optical characteristics through the nanostructure of composite silver-porous silicon (Ag-pSi) based periodical lattice. This is aimed at providing an interpretation of the optical spectra at known porosity in improvement of the light manipulating efficiency through a proposed structure. With boundary conditions correctly chosen, the numerical simulation was achieved using FDTD Lumerical solutions. This was used to investigate the effect of porosity and the number of layers on the reflection, transmission and absorption characteristics through a proposed structure in a visible wavelength range of 400–750 nm. The results revealed that the higher the number of layers, the lower the reflection. Also, the reflection increases with porosity increase. The transmission characteristics were the inverse to those found in the case of reflection spectra and optimum transmission was attained at high number of layers. Also, increase in porosity results in reduced transmission. Increase in porosity as well as in the number of layers led to an increase in absorption. Therefore, absorption into such structure can be enhanced by elevating the number of layers and the degree of porosity. •The composite silver-porous silicon (Ag-pSi) based periodical lattice was proposed.•Effect of porosity and layers number on the optical characteristics was highlighted.•Increase in porosity resulted in reduced transmission and increased in reflection.•Increase in porosity and layers number led to an increase in absorption.•Composite Ag-pSi can act as an active layer in enhancement of the light manipulating.
ISSN:0749-6036
1096-3677
DOI:10.1016/j.spmi.2018.01.028