Magnetically directed self-assembly of photonic crystals

光子晶体的磁定向自组装

• 批准号: 5325136
• 负责人: Professor Dr. Michael Farle
• 金额: --
• 依托单位: Forschungsgruppe Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2001
• 资助国家: 德国
• 起止时间: 2000-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5325136?language=en
• 关键词: Magnetically; directed; self; assembly; photonic

The formation of three-dimensional photonic crystals from magnetic core-shell colloids shall be investigated. Sub-micron sized core-shell particles consisting of layers of Ti02 and Fe304 nanocrystals around a latex core are dried from colloidal suspensions under the steering forces of a magnetic field gradient. This approach allows the study of condensation and structural phase transitions using different field gradients and boundary conditions. Magnetic and optical properties are determined by para- and ferromagnetic resonance and optical spectroscopy. Lithographically pre-patterned silicon substrates are used to stabilize two-dimensional seed layers for the growth of the 3D colloid crystals. Removal of the latex core is possible and magnetically tunable photonic crystal due to magnetostrictive distortions of the colloid crystals may be obtained.

研究磁核壳胶体形成三维光子晶体的方法。在磁场梯度的引导力下，亚微米大小的核壳粒子由围绕在乳胶核周围的二氧化钛和Fe304纳米晶体层组成，从胶体悬浮液中干燥出来。这种方法允许使用不同的场梯度和边界条件来研究缩合和结构相变。磁性和光学性质是由准磁共振和铁磁共振以及光谱学来确定的。光刻预图像化的硅衬底用于稳定三维胶体晶体生长的二维种子层。胶乳核的去除是可能的，并且由于胶体晶体的磁致伸缩变形，可以获得磁可调谐的光子晶体。