Volume holographic optical element for high-definition imaging
Volume holographic optical element for high-definition imaging
复制标题
用于高清成像的体全息光学元件
DOI：
10.1117/12.2614644
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Barada Daisuke
中科院分区：
文献类型：
--
作者：
Yamamoto Yuki;Barada Daisuke
体全息图在制备过程中通过多次曝光，表现出在同一区域内具有多种光学功能的特点。从特性上看，它有望应用于大容量记录介质和具有独特功能的衍射光学元件。本研究将体全息图应用于衍射光学元件，以实现纳米结构的高清晰度成像。假设的体全息衍射光学元件具有这样一种功能，即距离小于波长的两点光源的光波被衍射为具有不同波矢的平面波。当通过曝光由点光源和平面波组成的干涉条纹来制备体全息图时，通过将点光源照射到体全息图上来衍射平面波。但是，通过改变点光源的位置，改变了衍射平面波的波矢，降低了衍射效率。通过波矢滤波，平面波从位移位置的点源的衍射波变得检测不到。通过多次曝光，将移位位置的点源作为具有不同波矢的平面波进行衍射，即可制得体全息图。然后，两点源就可以解决了。两点源之间的距离称为移位选择性。为了制备体全息光学元件，使用了厚度为10 mm的光聚合物来获得短移位选择性。用波长为405 nm的半导体激光器对光聚合物进行曝光。在此条件下，获得了100 nm的移位选择性。
Volume holograms exhibit the characteristic of multiple optical functions in a common area by multiple exposure in preparation. From the characteristic, it is expected to be applied to large capacity recording medium and diffractive optical elements with unique functions. In this study, volume holograms are investigated to apply to diffractive optical elements for high-definition imaging of nanostructure. The assumed volume holographic diffractive optical element exhibits a function that light waves from two-point sources with a distance shorter than the wavelength are diffracted as plane waves with different wave vectors. When a volume hologram is prepared by exposing the interference fringes consist of a point source light and a plane wave, a plane wave is diffracted by illuminating a point source light onto the volume hologram. However, the wave vector of the diffracted plane wave is changed and the diffraction efficiency is decreased by shifting the position of the point source light. By wave vector filtering, the diffracted plane wave from a point source at shifted position becomes not to be detected. A volume hologram can be prepared that the point source at the shifted position is diffracted as a plane wave with a different wave vector by multiple exposure. Then, two-point sources can be resolved. The distance between two-point sources is called shift-selectivity. For preparing the volume holographic optical element, a photopolymer with a thickness of 10 mm was used to obtain short shift selectivity. The photopolymer was exposed by using a semiconductor lase with a wavelength of 405 nm. In this condition, a shift selectivity of 100 nm was achieved.
最先进的全息数据存储
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
的場 修
通讯作者：
的場 修
DOI：
10.2184/lsj.38.363
发表时间：
2010
期刊：
影响因子：
--
作者：
Junichi Ikeda
通讯作者：
Junichi Ikeda