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Influence of wetting state on optical reflectance spectra of Si nanopillar arrays

Title
Influence of wetting state on optical reflectance spectra of Si nanopillar arrays
Authors
Gwon, MinjiKim, SujungLi, JiaqiXu, XiumeiKim, Sun-KyungLee, EunsongyiKim, Dong-WookChen, Chang
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2015
Journal Title
JOURNAL OF APPLIED PHYSICS
ISSN
0021-8979JCR Link1089-7550JCR Link
Citation
vol. 118, no. 21
Publisher
AMER INST PHYSICS
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Finite-difference time-domain (FDTD) simulations showed that the reflectance spectra of crystalline Si nanopillar (NP) arrays with diameters of 40, 70, 100, and 130 nm differed depending on wetting state. The observed reflectance dips of the 40-nm-diameter NP array were in good agreement with those estimated from destructive interference conditions at the top and bottom of the NPs: the NP arrays were treated as a homogeneous medium with an effective permittivity according to the effective medium approximation model. In contrast, the dip positions of the FDTD-simulated spectra for 70-, 100-, and 130-nm-diameter NP arrays deviated from the results of interference calculations, particularly for short wavelengths. This suggested that Mie resonances in individual NPs significantly increased the absorption cross-section at the resonant wavelengths, which was sensitive to the refractive index of the surrounding medium (i.e., the wetting state). Optical reflectance measurements provide an easy and efficient means of inspecting the wetting behavior of non-flat surfaces. (C) 2015 AIP Publishing LLC.
DOI
10.1063/1.4936769
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자연과학대학 > 물리학전공 > Journal papers
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