Ordering/Lithography in Glasses/Alloys

该项目涉及基本的原子能级表征、合金有序和直写光刻。这些活动与超导、半导体和光学纳米结构有关。光刻方法利用直写的无机工艺，使用扫描透射电子显微镜(STEM)直径0.5 nm的高能光束将掺杂的硅酸盐玻璃薄膜转化为纳米结构，如纳米环。还可以形成硅纳米点和纳米线。在硅酸盐玻璃(直径约20 nm)中发现了图案化的Ge和Nb纳米环。纳米环阵列(各种元素)将在氮化硅薄膜上的硅酸盐薄膜中制备，并测量其半导体、超导和光学性能。纳米环的光学性质的计算是与F.Gar-CIA de Abajo合作进行的。该项目还涉及通过STEM形成约瑟夫森阵列和制造弱连接。该项目的总体智力价值在于通过新的方法来理解、表征和形成薄膜中的原子结构，以获得所需的新性质。这些包括永远循环的电流、具有负光学折射率的介质、用于计算的半导体量子纳米环和改进的金属间合金。%该项目解决与具有技术相关性的电子材料相关的基础材料科学研究问题。该项目的一个重要特点是高度重视教育，研究与教育相结合。该项目包括对学生的支持，计划在亚利桑那州科学博物馆举行的展览，乘坐特殊装备的小型巴士参观小学和高中，以及高中生的实验室之旅(http://www.asu.edu/clas/csss/csss/).***

This project addresses fundamental atomic level characterization, alloy ordering, and direct-write lithography. These activities are relevant to superconducting, semiconducting and optical nanos-tructures. The lithography approach utilizes a direct-write, inorganic process which uses the high-energy, 0.5nm diameter beam of a scanning transmission electron microscope (STEM) to convert doped silicate glass films to nanostructures, such as nanorings. Silicon nanodots and nanowires may also be formed. Patterned Ge and Nb nanorings in silicate glass (about 20nm in diameter) have been demonstrated. Arrays of nanorings (of various elements) will be fabricated in silicate films on silicon nitride membranes, and their semiconducting, superconducting and optical prop-erties measured. Calculations of optical properties of nanorings are in collaboration with F. Gar-cia de Abajo. The project also addresses formation of Josephson arrays and weak link fabrication via STEM. The general intellectual merit of the project lies in prospects for understanding, char-acterizing and forming atomic structures within thin films by new means in order to obtain wanted novel properties. These include electrical currents which circulate forever, media with negative optical refractive index, semiconductor quantum nanorings for computing and improved intermetallic alloys.%%% The project addresses fundamental materials science research issues associated with electronic materials having technological relevance. An important feature of the project is the strong em-phasis on education, and the integration of research and education. The project includes support of students, a planned exhibit at the Arizona Science Museum, visits to elementary and high schools in a specially equipped minibus, and laboratory tours for high school students (http://www.asu.edu/clas/csss/csss/).***