Cho Bomin, Um Sungyong, Woo Hee-Gweon, Sohn Honglae
Department of Chemisrty, Chosun University, 375 Seosuk-dong, Gwangju 501-759, Korea.
J Nanosci Nanotechnol. 2011 Aug;11(8):7163-6. doi: 10.1166/jnn.2011.4853.
New gradient optical filters containing asymmetric Bragg structure were prepared from the distributed Bragg reflector (DBR) porous silicon (PSi). Anisotropic DBR PSi displaying a rainbow-colored reflection was generated by using an asymmetric etching configuration. Flexible anisotropic DBR PSi composite films were obtained by casting of polymer solution onto anisotropic DBR PSi thin films. The surface and cross-sectional images images of anisotropic DBR PSi composite films obtained with cold field emission scanning electron microscope indicated that the average pore size and the thickness of porous layer decreased as the lateral distance increased. As lateral distance increased, the reflection resonance shifted to shorter wavelength.
采用分布式布拉格反射器（DBR）多孔硅（PSi）制备了包含非对称布拉格结构的新型梯度光学滤波器。通过使用非对称蚀刻配置，制备出呈现彩虹色反射的各向异性DBR PSi。通过将聚合物溶液浇铸到各向异性DBR PSi薄膜上，获得了柔性各向异性DBR PSi复合薄膜。利用冷场发射扫描电子显微镜获得的各向异性DBR PSi复合薄膜的表面和横截面图像表明，随着横向距离的增加，多孔层的平均孔径和厚度减小。随着横向距离增加，反射共振向更短波长移动。
