Astilean S, Lalanne P, Chavel P, Cambril E, Launois H
Opt Lett. 1998 Apr 1;23(7):552-4. doi: 10.1364/ol.23.000552.
We propose the use of high-index materials for the fabrication of subwavelength diffractive components operating in the visible domain. This approach yields a reduction of fabrication constraints and an improvement of theoretical performance. A blazed grating with subwavelength binary features and with a period of 5.75 wavelengths is designed and fabricated in a TiO(2) layer coated upon a glass substrate. The first-order diffraction efficiency measured with a He-Ne laser beam is 83%, which is slightly larger than that achieved theoretically by the best standard (continuous profile) blazed grating fabricated in glass with the same period.
我们建议使用高折射率材料来制造在可见光领域工作的亚波长衍射元件。这种方法减少了制造限制并提高了理论性能。在玻璃衬底上涂覆的TiO₂层中设计并制造了具有亚波长二元特征且周期为5.75个波长的闪耀光栅。用氦氖激光束测量的一阶衍射效率为83%，略高于理论上用相同周期在玻璃中制造的最佳标准（连续轮廓）闪耀光栅所达到的效率。
