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- 摘要
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Controlling ZnSe/GaAs interface properties: The role of elemental exposure and photon irradiation during growth initiation
摘要： Incorporating dissimilar semiconductors into a single platform can offer additional degrees of freedom for optoelectronic device design. However, bonding of elements with mixed valence at heterovalent interfaces often leads to defect formation and poor material quality. Using ZnSe/GaAs as a model system, we investigate the use of above-bandgap photon irradiation in combination with elemental surface treatments as a route to modify the interface properties. We find that this approach produces large changes in the behavior of the interfaces. Specifically, treating the GaAs surface with light and a short exposure to Se flux results in strong excitonic emission from both layers and an abrupt interface between them. We propose that these improvements arise from controlled desorption of As atoms from the GaAs surface and the subsequent Se enrichment of the interface. These results suggest that illumination with above-bandgap photons and proper choice of elemental exposure prior to heterovalent epitaxial layer growth may aid the synthesis of heterovalent semiconductor heterostructures.
关键词： interface properties,photon irradiation,heterovalent interfaces,elemental exposure,ZnSe/GaAs
更新于2025-09-04 15:30:14
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[IEEE 2018 24th International Conference on Pattern Recognition (ICPR) - Beijing, China (2018.8.20-2018.8.24)] 2018 24th International Conference on Pattern Recognition (ICPR) - Image Exploration Procedure Classification with Spike-timing Neural Network for the Blind
摘要： Individuals who are blind use exploration procedures (EPs) to navigate and understand digital images. The ability to model and detect these EPs can help the assistive technologies’ community build efficient and accessible interfaces for the blind and overall enhance human-machine interaction. In this paper, we propose a framework to classify various EPs using spike-timing neural networks (SNNs). While users interact with a digital image using a haptic device, rotation and translation-invariant features are computed directly from exploration trajectories acquired from the haptic control. These features are further encoded as model strings through trained SNNs. A classification scheme is then proposed to distinguish these model strings to identify the EPs. The framework adapted a modified Dynamic Time Wrapping (DTW) for spatial-temporal matching with Dempster-Shafer Theory (DST) for multimodal fusion. Experimental results (87.05% as EPs’ detection accuracy) indicate the effectiveness of the proposed framework and its potential application in human-machine interfaces.
关键词： Dempster-Shafer Theory,Spike-timing Neural Network,Spatio-temporal Pattern,Exploration Procedures,Haptic-based Interface,Blind Community
更新于2025-09-04 15:30:14
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Surface-Plasmon Assisted Transmission Through an Ultrasmall Nanohole of ~ 10 nm with a Bull’s Eye Groove
摘要： We simulate the light transmission through an extremely small nanoscale aperture having a 10 nm diameter punctured in a metal ?lm positioned at the center of a plasmonic bull’s eye grating. A considerable directive emission of transmitted light with a divergence angle of 5.7 degrees was observed at 10 μm from the nanohole opening at the frequency of surface plasmon polariton excitation, an con?rmed by measuring the distance dependent transmission amplitude. Observations of the electric ?eld in cross-sectional, near-?eld, and far-?eld views near-?eld enhancement associated with the surface plasmon excitation, and the interference of the electric ?eld light through the nanohole in the near-?eld region is responsible for such a considerable directive emission.
关键词： Plasmons on surface and interface,Optical di?raction,Optical properties of nanostructures
更新于2025-09-04 15:30:14