Ellipsometric studies on rough Zn and Cd polycrystalline samples | ||
| Journal of Scientific Research in Science | ||
| Article 2, Volume 37, Part 1 (Basic Sciences), February 2020, Pages 22-30 PDF (1.13 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jsrs.2020.129799 | ||
| Authors | ||
| Mohamed Shehata* 1; S. S. Ibrahim2; M. H. Osman2; N. N. Nagib3 | ||
| 1Secondary Standard Department, National Institute of Standard (NIS), Giza, Egypt. | ||
| 2Physics department, Faculty of Science, Cairo University, Giza, Egypt | ||
| 3National Institute of Standards, Giza, Egypt | ||
| Abstract | ||
| A manual null ellipsometer is constructed and used to determine the optical constants of zinc and cadmium of different surface roughness at the wavelength 632.8 nm, angle of incidence 45° and room temperature. The studied samples are polycrystalline sheets of thickness ~ 0.05 mm and surface area 30 mm x 30 mm. The samples were mechanically polished using diamond paste of different grain sizes. The final stage of polishing for the samples was with pastes of grain size 0.5 μm, 2.5 μm, 5 μm, 10 μm and 14 μm. The ellipsometric parameters and were obtained and were used to calculate the optical constants (refractive index) and (extinction coefficient).It was found that as the roughness is increased, the refractive index increases while the extinction coefficient decreases. The used optical arrangement for ellipsometric measurements is presented and the procedure for extracting the results is explained. The uncertainty in the results is calculated and included in the results. | ||
| Keywords | ||
| Zinc and Cadmium; Rough samples; Ellipsometry; Optical constants | ||
| References | ||
|
[1] N. N. Nagib, M. S. Bahrawi, H. Osman, N. A. Mahmoud, M. H. Osman, A. W. Abdallah, "A precise method for determining the principal angle of incidence and the optical constants of metals", Meas. Sci. Technol. 27: (2016), https://doi.org/10.1088/0957-0233/27/1/015009
[2] D. Goldstein, Polarized Light 3rd Ed., FL: CRS Press, (2011), Boca Raton.
[3] D. M. Kolb, "Determination of the optical constants of solids by reflectance-ratio measurements at non-normal incidence", J. Opt. Soc. Am. 62: (1972) 599.
[4] T. E. Darcie, M. S. Whalen, "Determination of optical constants using pseudo-Brewster angle and normal incidence reflectance measurements", Appl. Opt. 23: (1984) 1130-1131.
[5] V. Sirtori, L. Magagnin, E. Saglia, P.L. Cavallotti, "Calculation model of rough gold optical constants", Surf. Sci. 554: (2004) 119-124.
[6] N. N. Nagib, N. A. Mahmoud, L. Z. Ismail, M. A. Amer, Kh. Abd-El-Sabour, "Effect of surface roughness on the optical constants of bulk polycrystalline gold samples", Optik 125: (2014) 1085-1087.
[7] L. G. Schulz, "An interferometric method for the determination of the absorption coefficients of metals, with results for silver and aluminum", J. Opt. Soc. Am. 41: (1951) 1047-1051.
[8] T. Babeva, S. Kitova, and I. Konstantinov, "Photometric methods for determining the optical constants and the thicknesses of thin absorbing films: selection of a combination of photometric quantities on the basis of error analysis", Appl. Opt. 40: (2001) 2675-2681.
[9] D. M. Kolb, "Determination of the optical constants of solids by reflectance-ratio measurements at non-normal incidence", J. Opt. Soc. Am. 62: (1972) 599.
[10] C. A. Fenstermaker, F. L. McCrackin, "Errors arising from surface roughness in ellipsometric measurement of the refractive index of a surface", Surf. Sci. 16: (1969) 85-96.
[11] Ya. B. Soskovets, A. Ya. Khairullina, T. A. Zhevlakova and V. A. Tolmachev, "Effect of the structure of smooth copper surfaces on the accuracy of determination of the optical constants of copper", Opt. Spectros. 97: (2004) 951-955.
[12] M. Born, E. Wolf, Principles of Optics, Cambridge university press, (2003), united kingdom. | ||
|
Statistics Article View: 251 PDF Download: 264 |
||
