Ordering/Lithography in Glasses/Alloys

该项目涉及基本的原子级表征，合金排序和直写光刻。这些活动与超导、半导体和光学纳米结构有关。光刻方法采用直接写入的无机工艺，利用扫描透射电子显微镜（STEM）的高能，直径0.5nm的光束将掺杂的硅酸盐玻璃薄膜转化为纳米结构，如纳米片。硅纳米点和纳米线也可以形成。在直径约20nm的硅酸盐玻璃中发现了图案化的Ge和Nb纳米结构。将在氮化硅膜上的硅酸盐薄膜中制造（各种元素）纳米片阵列，并测量其半导体、超导和光学性质。纳米材料光学性质的计算是与F. Gar-cia de Abajo合作进行的。该项目还解决了约瑟夫森阵列的形成和通过STEM制造弱链路的问题。该项目的总体智力价值在于通过新的手段来理解、表征和形成薄膜内的原子结构，以获得想要的新性质。这些技术包括永久循环的电流、具有负光学折射率的介质、用于计算的半导体量子纳米和改进的金属间合金。该项目涉及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，并将研究与教育相结合。该项目包括对学生的支持，计划在亚利桑那科学博物馆举办展览，乘坐特别装备的小巴参观小学和高中，以及为高中生参观实验室（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/).***