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Article
Formation of Mid-Infrared Slot Antenna Arrays on Thin Al2O3/Si Structures Fabricated by Atomic Layer Deposition

Authors: Amjd A. Salman --- Malik S. Ashoor
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 4 Pages: 25-28
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The vertical distribution of the electric field enhancement produced by optical antennas could be experimentally confirmed. The combination of the antenna and a quantum cascade laser would yield attractive mid-infrared microscopic analysis to detect a solid state surface. In this work, slot antenna arrays were formed on a thin Al2O3 layer grown by atomic layer deposition on a silicon substrate. Reflectivity spectra measured in the mid-infrared range showed characteristic aspects, presumably caused by the surface phonon polariton of a SiO2 layer naturally formed on the Si substrate. When the Al2O3 layer thickness was 6 nm, such spectral features disappeared. In this way, we could estimate experimentally the electric field distribution normal to the surface of the substrate.


Article
X-Ray Absorption Fine Structure Spectroscopy of Alumina-Supported Copper Oxide for Conversion Electron Yield Detection

Authors: Rafeef J. Alwan --- Maher F. Mahmood --- Salam R. Khalaf
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 4 Pages: 29-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, the in-situ x-ray absorption fine structure cell was developed for the conversion electron yield detection to characterize active metal species under reaction gas atmosphere. The probe depth was estimated to be about 9 nm at the Cu K edge. The in-situ conversion electron yield cell was applied to the shape-controlled γ-Al2O3-supported Cu2O catalyst. The reduction to Cu(0) by H2 of octahedral Cu2O particles proceeded at lower temperature than cubic particles, indicating that the surface atomic arrangement affects to the redox reaction of solid particles.

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