Knowledge of temperatures at the nanoscale is essential for studying and controlling the heat-induced local thermal responses. The temperature rise of a heated nanoparticle (NP) near the interface of two kinds of media with different thermal conductivities is numerically investigated. We find that the temperature rise becomes size independent if it is scaled by the temperature rise in the case where the particle-interface distance is zero and the distance is scaled by the equivalent radius of the NP. This universal scaling behavior can be understood with the principle of dimensional homogeneity. An empirical equation is retrieved to predict the actual particle temperature at a given position. Our results may benefit precise control of heat at the nanoscale with applications in plasmonic absorbers, immunotargeted photothermal cancer cell killing, etc.
Exploring the regional fractures in urban area and its surroundings is an important issue. Satellite remote sensing image can be used to
illustrate the panorama of regional fractures and structures on macroscopic view. Fusion of multi-source images(especially SAR and
optical multi-spectral image) is a hot spot in RS information processing and application field. A image fusion based linear structure
information detection method is proposed in this paper. After introducing wavelet and wavelet packet transform and their applications
in image fusion, a regional standard deviation wavelet coefficients fusion method is proposed. Experimental result shows wavelet
packet fusion is better than wavelet fusion in resolution enhancement for fusion of Radarsat SAR and Landsat MSS, ETM+ multispectral
remote sensing images. Study of exploring shallow-buried regional fracture information covered by Quaternary
unconsolidated sediments in Hangzhou area shows the fusion method applied on SAR and optical multi-spectral RS image can
improve resolution and the capability of interpret shallow-buried fractures.
Grating Light Valve (GLV) is a kind of optics device based on Micro-Opto-Electro-Mechanical System (MOEMS)
technology, utilizing diffraction principle to switch, attenuate and modulate light. In this paper, traditional GLV device's
structure and its working principle are illuminated, and a kind of modified GLV structure is presented, with details
introduction of the fabrication technology. The GLV structure includes single crystal silicon substrate, silicon dioxide
isolating layer, aluminum layer of fixed ribbons and silicon nitride of movable ribbons. In the fabrication, lots of
techniques are adopted, such as low-pressure chemical vapor deposition (LPCVD), photolithography, etching and
evaporation. During the fabrication processes, Photolithography is a fundamental and fatal technology, which determines
etching result and GLV quality. Some methods are proposed through repeated experiments, to improve etching result
greatly and guide the practical application. This kind of GLV device can be made both small and inexpensively, and has
been tested to show proper range of actuation under DC bias, with good performance. The GLV device also has merits
such as low cost, simple technology, high fill ratio and low driving voltage. It can properly be well used and match the
demands of high light power needed in laser phototypesetting system, as a high-speed, high-resolution light modulator.