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Full-Text Articles in Engineering Science and Materials

Electronic And Plasmonic Properties Of Nano-Sized Gold/Strontium Titanate Interface, Jiechang Hou Jan 2015

Electronic And Plasmonic Properties Of Nano-Sized Gold/Strontium Titanate Interface, Jiechang Hou

Publicly Accessible Penn Dissertations

In this thesis, nano-sized metal/oxide interfaces are fabricated to determine the size dependence of electronic and resistive switching properties, effect of atomic structure on the orientation dependence of electronic properties, and mechanisms of plasmon-induced current enhancement.

A combination of drop-casting and high temperature annealing enables orientation control over nano-sized metal/oxide interfaces. To examine the electronic properties, individual Au nanoparticle/SrTiO3 interfaces with sizes ranging from 20 to 150 nm are characterized via conductive atomic force microscopy, for two distinct interface orientations. Current-voltage characterization enables the determination of dominant electron transport mechanisms. The development of a depletion region results ...


Optomechanical Devices And Sensors Based On Plasmonic Metamaterial Absorbers, Hai Zhu Jan 2015

Optomechanical Devices And Sensors Based On Plasmonic Metamaterial Absorbers, Hai Zhu

Publicly Accessible Penn Dissertations

Surface plasmon resonance is the resonant oscillations of the free electrons at the interface between two media with different signs in real permittivities, e.g. a metal and a dielectric, stimulated by light. Plasmonics is a promising field of study, because electron oscillations inside a subwavelength space at optical frequencies simultaneously overcome the limit of diffraction in conventional photonics and carrier mobilities in semiconductor electronics. Due to the subwavelength confinement, plasmonic resonances can strongly enhance local fields and, hence, magnify light-matter interactions. Optical absorbers based on plasmonic metamaterials can absorb light resonantly at the operating wavelengths with up to 100 ...


Manipulation Of Light-Matter Interaction In Two-Dimensional Systems Via Localized Surface Plasmons, Joohee Park Jan 2015

Manipulation Of Light-Matter Interaction In Two-Dimensional Systems Via Localized Surface Plasmons, Joohee Park

Publicly Accessible Penn Dissertations

Localized surface plasmons (LSPs), which are collective charge oscillation confined by metallic nanoparticles, gained much interest in the field of optoelectronics due to its ability to confine light down to nanoscale without a diffraction limit. As light-matter interaction in nanoscale is becoming more important due to the demand in scaling down the optoelectronic devices, my thesis describes the work on manipulation of such light-matter interaction enabled by LSPs. First, periodically patterned two-dimensional arrays of bowties were investigated to study the localized surface plasmon (LSP) resonances via reflection measurements and numerical simulations. Due to the grating created by arrays of bowties ...