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Influence of wetting state on optical reflectance spectra of Si nanopillar arrays
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gwon, Minji Kim, Sujung Li, Jiaqi Xu, Xiumei Kim, Sun Kyung Lee, Eunsongyi Kim, Dong-Wook Chen, Chang |
| Copyright Year | 2015 |
| 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... |
| Starting Page | 213102 |
| Ending Page | 213102 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1063/1.4936769 |
| Volume Number | 118 |
| Alternate Webpage(s) | http://npl.khu.ac.kr/paper/1.4936769.pdf |
| Alternate Webpage(s) | https://doi.org/10.1063/1.4936769 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
