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Showing 1 to 14 of 14 for “"interband transitions"”.
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Optical investigation of bismuth selenide (Bi2Se3) and antimony telluride (Sb2Te3).
… range from 1500 to 3000 cm−1 , reflecting transitions between bands with complex dispersion. This linearity might be interpreted as a signature of three-dimensional (bulk) Dirac bands. However, no linearity is observed in Sb2Te3. The Drude like contribution at low frequencies may be a …
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Piezoreflectance of gallium arsenide
… the (001) and (111) directions was determined. Interband transitions were detected at 1.425 t .015, 1.76 t .02, 2.89, 3.12, and 4.5 eVe The two lowest energy transitions are shown compatible with r symmetry, and the Pikus and Bir deformation potential ratio d/b ~ 3.2 is determined. Second …
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Dynamic control of plasmonic resonances with graphene based nanostructures
… that it is possible to use the highly tunable interband transitions in graphene to effectively control the plasmonic resonance in mid-infrared (MIR) wavelengths. We then outline the current challenges in achieving modulation in the technologically relevant near-infrared (NIR) wavelengths. One …
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Theory of voltage oscillations in ultra-small capacitance Josephson junctions
… = 2ew/211"". Chapter 5 considers the effects of interband or ""Zener"" transitions by introducing a simple model to study how dissipation affects the rate of interband transitions. Chapter 6 is a synopsis of some experiments which may indirectly provide evidence of Bloch oscillations. Finally, …
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Longwave and bi-color type-II InAs/(In)GaSb superlattice infrared detectors
… Presently photonic IR detectors are based on interband transitions in low bandgap semiconductors such as mercury cadmium telluride (MCT) or InSb or in intersubband transitions in hetero-engineered structures such as quantum well or quantum dot infrared photodetectors (QWIPs or QDIPs). These …
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Graphene Modulators for Silicon Photonic Optical Links
… graphene becomes transparent to absorption via interband transitions. Operating in the transparency regime means that the graphene phase modulator is capable of pure phase modulation which is a desirable property for complex modulation formats. Benefiting from efficient phase modulation, the …
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Reconfigurable Photonics based on Broadband Low-loss Optical Phase Change Materials
… GST alloys, benefiting from blue-shifted interband transitions as well as minimal free carrier absorptions, as confirmed by Hall measurements. In-situ heating TEM and XRD measurements are carried out to confirm and understand the crystal structures of Ge₂Sb₂Se₄Te₁. We show that the …
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Mechanical, electronic and optical properties of multi-ternary semiconductor alloys
… in the optical spectra are assigned to the interband transitions in accord with the calculated band structures. The trends of these properties with respect to crystal structures and VI (S, Se and Te) anion atoms are explored qualitatively.
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Enhancement of the UV emission in metal nanoparticle-coated ZnO
… results. This model suggests that the interband transitions in Au in the UV spectral range, from the 5d band to the partly filled 6sp conduction band, can be excited by the exciton emissions in ZnO via a resonance energy transfer mechanism. The creation of this additional, faster …
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Optical properties of metal nanoparticles and their influence on silicon solar cells
… preferred choice due to a decreased effect from interband transitions in comparison with Au and Cu. Al nanoparticles were found to exhibit markedly different optical properties to identical noble metal nanoparticles, with broader, weaker resonances that can be excited further into the UV. …
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Investigation of InAs/GaSb superlattice based nBn detectors and focal plane arrays
… detectors for these applications are based on interband transitions in pn junctions made of mercury cadmium telluride (MCT) or InSb, and intersubband transistions in quantum well infrared detector(QWIP). However, lack of spatial uniformity over larger area and difficulties with the material …
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Exciton-like behavior in low-energy absorption spectra of simple alloys
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T16:07:50Z No. of bitstreams: 1 1984_bakshi.pdf: 3621630 bytes, checksum: ba96b4397a92b0e178784881f3ea82a3 (MD5)
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Advanced simulations of cross-linked thermoset and conjugated polymers for multifunctional applications
… governed by both inter-band and intra-band transitions. The conductivity of cis-PA is further explored by introducing p-type dopants and injecting charge into pristine material. These modifications significantly alter the electronic structure and enhance conductivity. Detailed analyses …
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Nonreciprocal coupling to microstrip resonators
… and waveguides. One such technique, indirect interband scattering, uses a traveling wave bias to scatter light between two modes which differ in frequency and momentum. Due to momentum conservation, this process is inherently nonreciprocal --- light traveling in different directions will be …