Double-layer high-contrast subwavelength gratings that are separated by a dielectric space layer are investigated to achieve ultra-broadband reflection. The reflection phase of subwavelength gratings and the propagation phase shift between two gratings are manipulated to expand reflection bandwidth by properly stacking two reflective gratings. A reflector exhibiting a 99% reflectance bandwidth of ∼ 1080    nm in the near-infrared is designed. Then this reflector is prepared using laser interference lithography and ion beam planarization, and an ultra-broadband reflection is achieved with reflectance exceeding 97% over a wavelength range of 955 nm in the near-infrared region.

In recent years, the conflict between urban development and cultural protection has becomes more intense with the acceleration of urbanization progress of China. The protection of cultural heritage not only needs the perfection of relevant laws, but also requires the autonomous participation of the public. Public self-awareness is the basic premise of protecting tangible and intangible cultural heritage, while scholars are the intelligence security for the protection and inheritance of traditional culture. The actions and measures made by the Korea society in the aspects of cultural diversity and cultural development provide us with many beneficial references. Cultural heritage is the common wealth of all human being currently; every one, every country or the international society all has the responsibility and obligation to protect and inherit cultural heritage. This study explored and analyzed the cultural diversity and development of the Korea society in the perspectives of the protection and inheritance of folk custom and intangible cultural heritage.

No abstract

No abstract

We present a computational manufacturing program for monitoring group delay dispersion (GDD). Two kinds of dispersive mirrors computational manufactured by GDD, broadband, and time monitoring simulator are compared. The results revealed the particular advantages of GDD monitoring in dispersive mirror deposition simulations. The self-compensation effect of GDD monitoring is discussed. GDD monitoring can improve the precision of layer termination techniques, it may become a possible approach to manufacture other optical coatings.