Polaritonic and photonic gaps in SiO2/Si and SiO2/air periodic structures |
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| Authors: | Herman H gstr m,Carl G. Ribbing |
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| Affiliation: | a Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, Box 534, SE-751 21, Uppsala, Sweden;b Department of Functional Materials, Swedish Defence Research Agency, Box 1165, SE-581 11, Linköping, Sweden |
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| Abstract: | The one-dimensional (1D) photonic crystals (PhC) Si/SiO2, SiO2/Si and SiO2/air are studied to investigate the coexistence and interaction of polaritonic and structural gaps. Optical multilayer calculations as well as infrared reflectance measurements in the 2.7–12 μm range for relevant cases have been carried out. The samples were prepared by standard chemical vapor deposition (CVD) processes. Satisfactory agreement between experimental and calculated results was obtained without fitting. The calculated results verify the presence of a polaritonic gap for thicknesses much lower than the wavelength for the cases SiO2/Si and SiO2/air. Including also the case Si/SiO2, we find the polaritonic peak can be strengthened, unchanged, or extinguished by the interaction between structural and polaritonic effects. All these predictions have been experimentally verified. |
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| Keywords: | Polaritonic gaps Photonic gaps Multilayer Reststrahlen band |
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