Fu Qianqian, Chen Ang, Shi Lei, Ge Jianping
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China.
Chem Commun (Camb). 2015 Apr 30;51(34):7382-5. doi: 10.1039/c5cc00324e.
This work reported a high quality photonic crystal film with an ultra-narrow photonic bandgap obtained via a chemical synthetic route. The bandgap is much narrower than that of traditional colloidal crystals, which makes the film qualified for use in optical devices. The narrow PBG originates from not only the high crystallinity and uniform orientations of microcrystals within the film but also the very close refractive indices between the silica and the polymer matrix. Due to the matching of the refractive index, the amorphous contents of the film are optically transparent and do not interfere with the reflection, so that the photonic crystal film is tolerant of the existence of disordered contents.
这项工作报道了一种通过化学合成路线获得的具有超窄光子带隙的高质量光子晶体薄膜。该带隙比传统胶体晶体的带隙窄得多，这使得该薄膜适用于光学器件。窄带隙不仅源于薄膜内微晶的高结晶度和均匀取向，还源于二氧化硅与聚合物基体之间非常接近的折射率。由于折射率匹配，薄膜的非晶成分是光学透明的，不会干扰反射，因此光子晶体薄膜能够容忍无序成分的存在。
