Design of Functional Window Using Diffractive Optlcal Elements
We propose a new functional window using diffractive optical elements. This functional window is designed to divert the incident solar illumination up onto a ceiling. If the ceiling is white and reflecting, the light provides an alternative source of lighting rather than the use of electric lighting. It saves electrical bills in daytime. This functional window is composed of a prism and a diffuser. We simulated the diffraction pattern of the light incident to the window. In this simulation, incident light of over 80％ was refracted upward by using prism. There are many materials to be used to make the window. We choose UV-resin as the material because of high stability and transparency in thin films. We also use azobenzene polymers as the holographic recording materials because high efficiency surface relief hologram can be recorded. At-ion laser beam at 514nm is collimated to 1cm in diameter, and input to a master diffuser. The speckle pattern of the diffused light from the master diffuser is recorded on the azobenzene polymer film. A diffuser with about 1mm depth was recorded. The recorded diffuser and prism are replicated on the UV- resin. The size of the prototype window is 1cm x 2cm and total thickness is 0.2mm. Diffusion pattern of the window was measured by using a white color diode as an incident light. More than 60％ of the incident light was refracted upward. Uniform illuminated pattern was obtained on the ceiling.
functional window prism diffuser
Daisuke Sakai Kenji Harada Shun-ich Kamemaru
Kitami Institute of Technology, Japan
国际会议
2006现代科技国际研讨会(The International Workshop on Modern Science and Technology in 2006)
北京
英文
271-275
2006-04-01（万方平台首次上网日期，不代表论文的发表时间）