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AlGaN composition dependence of the band offsets for epitaxial Gd2O3/AlxGa12xN (0 &lex &le0.67) heterostructures

Applied Physics Letters

Ihlefeld, Jon I.; Brumbach, Michael T.; Allerman, A.A.; Wheeler, David R.; Atcitty, Stanley A.

Gd2O3 films were prepared on (0001)-oriented AlxGa1-xN (0≤x≤0.67) thin film substrates via reactive molecular-beam epitaxy. X-ray diffraction revealed that these films possessed the cubic bixbyite structure regardless of substrate composition and were all 111-oriented with in-plane rotations to account for the symmetry difference between the oxide film and nitride epilayer. Valence band offsets were characterized by X-ray photoelectron spectroscopy and were determined to be 0.41±0.02eV, 0.17±0.02eV, and 0.06±0.03eV at the Gd2O3/AlxGa1-xN interfaces for x=0, 0.28, and 0.67, respectively.

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TYPE Journal Article YEAR 2014
ScopusOSTIDOI

Thermal boundary conductance accumulation and spectral phonon transmission across interfaces: experimental measurements across metal/native oxide/Si and metal/sapphire interfaces

Nature Communications

Ihlefeld, Jon I.; Brown-Shaklee, Harlan J.; Cheaito, Ramez C.; Gaskins, John T.; Caplan, Matthew E.; Donovan, Brian F.; Foley, Brian M.; Giri, Ashutosh G.; Duda, John C.; Szwejkowski, Chester J.; Constantin, Costel C.; Hopkins, Patrick E.

Abstract not provided.

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TYPE Journal Article YEAR 2014
OSTI

Optical magnetic mirrors without metals

Optica

Liu, Sheng; Sinclair, Michael B.; Mahony, Thomas S.; Jun, Young C.; Campione, Salvatore; Ginn, James; Bender, Daniel A.; Wendt, J.R.; Ihlefeld, Jon I.; Clem, Paul G.; Wright, Jeremy B.; Brener, Igal B.

The reflection of an optical wave from metal, arising from strong interactions between the optical electric field and the free carriers of the metal, is accompanied by a phase reversal of the reflected electric field. A far less common route to achieving high reflectivity exploits strong interactions between the material and the optical magnetic field to produce a “magnetic mirror” that does not reverse the phase of the reflected electric field. At optical frequencies, the magnetic properties required for strong interaction can be achieved only by using artificially tailored materials. Here, we experimentally demonstrate, for the first time to the best of our knowledge, the magnetic mirror behavior of a low-loss all-dielectric metasurface at infrared optical frequencies through direct measurements of the phase and amplitude of the reflected optical wave. The enhanced absorption and emission of transverse-electric dipoles placed close to magnetic mirrors can lead to exciting new advances in sensors, photodetectors, and light sources.

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TYPE Journal Article YEAR 2014
ScopusOSTIDOI
Results 76–100 of 203
Results 76–100 of 203