Browsing by Author "Brown, AS"

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    Borrowing Personal Memories
    (Applied Cognitive Psychology, 2015-01-01) Brown, AS; Croft Caderao, K; Fields, LM; Marsh, EJ
    © 2015 John Wiley & Sons, Ltd.The present investigation documents memory borrowing in college-age students, defined as the telling of others' autobiographical stories as if they are one's own. In both pilot and online surveys, most undergraduates admit to borrowing personal stories from others or using details from others' experiences to embellish their own retellings. These behaviors appear primarily motivated by a desire to permanently incorporate others' experiences into one's own autobiographical record (appropriation), but other reasons include to temporarily create a more coherent or engaging conversational exchange (social connection), simplify conveying somebody else's interesting experience (convenience), or make oneself look good (status enhancement). A substantial percentage of respondents expressed uncertainty as to whether an autobiographical experience actually belonged to them or to someone else, and most respondents have confronted somebody over ownership of a particular story. Documenting memory borrowing is important as the behavior has potential consequences for the creation of false memories.
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    Room temperature photoluminescence from InxAl(1-x)N films deposited by plasma-assisted molecular beam epitaxy
    (Applied Physics Letters, 2014-09-29) Kong, W; Mohanta, A; Roberts, AT; Jiao, WY; Fournelle, J; Kim, TH; Losurdo, M; Everitt, HO; Brown, AS
    © 2014 AIP Publishing LLC.InAlN films deposited by plasma-assisted molecular beam epitaxy exhibited a lateral composition modulation characterized by 10-12 nm diameter, honeycomb-shaped, columnar domains with Al-rich cores and In-rich boundaries. To ascertain the effect of this microstructure on its optical properties, room temperature absorption and photoluminescence characteristics of InxAl(1-x)N were comparatively investigated for indium compositions ranging from x = 0.092 to 0.235, including x = 0.166 lattice matched to GaN. The Stokes shift of the emission was significantly greater than reported for films grown by metalorganic chemical vapor deposition, possibly due to the phase separation in these nanocolumnar domains. The room temperature photoluminescence also provided evidence of carrier transfer from the InAlN film to the GaN template.
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    Ultraviolet-Visible Plasmonic Properties of Gallium Nanoparticles Investigated by Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry
    (ACS Photonics, 2014-07-16) Yang, Y; Akozbek, N; Kim, TH; Sanz, JM; Moreno, F; Losurdo, M; Brown, AS; Everitt, HO
    © 2014 American Chemical Society.Self-assembled, irregular ensembles of hemispherical Ga nanoparticles (NPs) were deposited on sapphire by molecular beam epitaxy. These samples, whose constituent unimodal or bimodal distribution of NP sizes was controlled by deposition time, exhibited localized surface plasmon resonances tunable from the ultraviolet to the visible (UV/vis) spectral range. The optical response of each sample was characterized using a variable-angle spectroscopic ellipsometer, and the dielectric response of the ensemble of NPs on each sample was parametrized using Lorentz oscillators. From this, a relationship was found between NP size and the deduced Lorentzian parameters (resonant frequency, damping, oscillator strength) for most unimodal and bimodal samples at most frequencies and angles of incidence. However, for samples with a bimodal size distribution, Mueller matrix ellipsometry revealed nonspecular scattering at particular frequencies and angles, suggesting a resonant interparticle coupling effect consistent with recently observed strong local field enhancements in the ultraviolet. (Graph presented).