Defects and Their Origin in Thin Films of (001) Alkaline Earth Oxides

MgO is used as an optical isolation layer for waveguides epitaxially grown on Si. Crystalline perfection of MgO is critical because it serves as a substrate for the single crytal, perovskite guiding layer. Imperfections in the MgO will result in imperfections in the guiding layer and lead to large optical losses for the planar waveguide structure. It is shown that the most common defect to form in thin MgO films are twin boundaries between {l_brace}111{r_brace}-type planes. Highest density of twins is observed when (001) MgO is grown directly on silicon/MgO interlayers containing Ba. Twinning is shown to accommodate the large size of Ba impurities incorporated in the MgO films through formation of internal grain boundaries and oper surface other than the growing (001) of MgO

Defects and their origin in thin films of (001) alkaline earth oxides

MgO is used as an optical isolation layer for waveguides epitaxially grown on Si. Crystalline perfection of MgO is critical because it serves as a substrate for the single crytal, perovskite guiding layer. Imperfections in the MgO will result in imperfections in the guiding layer and lead to large optical losses for the planar waveguide structure. It is shown that the most common defect to form in thin MgO films are twin boundaries between {l_brace}111{r_brace}-type planes. Highest density of twins is observed when (001) MgO is grown directly on silicon/MgO interlayers containing Ba. Twinning is shown to accommodate the large size of Ba impurities incorporated in the MgO films through formation of internal grain boundaries and oper surface other than the growing (001) of MgO

Thermoplasmonics in Thin Metal Films

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Optical and plasmonic spectroscopy with cantilever shaped materials

International audienceMicro- and nanocantilevers, which have traditionally played a vital role in the development offorce microscopy, and more recently a special role in biological, chemical and physicalsensing and detection, have received comparatively little attention in optical spectroscopy. Wepresent an investigation of the optical response of microcantilevers towards their utilization inintegrated spectrometers in a broad part of the spectrum. By discussing the overall actuationmechanism we describe how surface modes may effectively contribute to the final signal.Using Fourier transform infrared (FTIR) spectroscopy, a series of multilayeredmicrocantilevers are characterized for their spectral response in the range from 7800 to400 cm¡1. Transmission FTIR and FTIR photothermal spectroscopy are carried out usingpolystyrene with well-established infrared spectra