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Responsibility of Optlcal Fleld in Nano-Stractured Materials

Author: ChiLiMing
Tutor: LiXiangTing
School: Shanghai Jiaotong University
Course: Optics
Keywords: Nanomaterials Lateral photovoltaic Focus light field
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 31
Quote: 0
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Abstract


New Electronic Materials, including its design, performance, preparation and processing of new ideas, new discoveries, new methods, new technologies, materials research in the field has long been a hot spot. Information with new properties optoelectronic materials research and development of electronic technology industry, economic development and enhance overall national strength has important strategic significance. Nano-materials, nano science and technology is an important direction of development. Nanomaterials are defined by the fine grains, characterized in size of nanoscale dimension (1 ~ 100nm) of the solid material. Because of very fine grain, a lot of grain in the grain boundaries and defects within the center of the atom as well as its inherent quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect, nano-materials with the same composition micron crystals ( bulk) material compared to the catalytic, optical, magnetic, mechanical, and so has many strange properties, and thus become the field of materials science and condensed matter physics in the research focus. This research involved the study focuses on the structure of nanomaterials in a uniform light field or points of light irradiation exhibit novel optical properties. The main research subjects were divided into two categories: First, the semiconductor - metal junction (MS structure) is a typical multi-layer structures. This structure for the specific wavelength of the laser will exhibit lateral photovoltaic effect and the waveguide effect; two embedded metal structure. This structure is embedded in the form of metal in bulk to another dielectric, the dielectric may be changed with the need, when necessary, may be air or vacuum. Embedded structure in a uniform light field irradiation will exhibit focusing light field positioning the role of energy. For the multilayer film structure, this paper a novel sensitive detector displacement (PSD), such detectors based on metal - semiconductor (MS) structure. Sample mentioned in the text by the silicon substrate, the natural oxide layer and a gold film constituted in the displacement detection has demonstrated high sensitivity and good linearity. Moreover, the sample produced by the lateral photovoltaic (LPV) as the light incident angle will change, indicating that production of the waveguide structure has a great potential applications. For embedded structures, we propose a method to control the time reversal nano plasma energy systems strongest point. The method is based on a point system Nano ultrashort pulse excitation of localized far-field time reversal. Despite the presence of metal plasma system very strong interference and serious phase shift and dispersion, and made time reversal is incomplete, but the method in the control of nanoscale light field energy is very effective, can be applied to nano-spectroscope , optical modulation, ultra-dense information storage and nano-information processing fields.

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