A new approach to dynamic wave field synthesis using computer generated volume holograms
A new approach to dynamic wave field synthesis using computer generated volume holograms
复制标题
使用计算机生成的体全息图进行动态波场合成的新方法
DOI：
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发表时间：
2013
期刊：
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通讯作者：
R. Bergmann
中科院分区：
文献类型：
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作者：
E. Kamau;C. Falldorf;R. Bergmann
我们提出了一种角复用系统的新设计，该系统便于使用3D衍射光学元件动态合成预定义的波场。在该系统中，给定远场强度的几个角投影被编码在单个计算机生成的体全息图（CGVH）中。空间光调制器（SLM）用于调制碰撞平面参考波，从而允许对单个投影进行动态解码。这也有助于解码各种投影的线性组合，因此与传统的二维静态衍射光学元件相比，可以应用于合成具有更高空间带宽乘积的波场。我们提出了一种基于3D激光光刻的聚合物全息图制造方法，并因此在设计过程中纳入了相应的制造限制。通过数值模拟系统的传播，进行了初步的可行性研究。所得结果表明，与级联光学元件相比，在衍射效率和角选择性方面具有优越的性能。
We present a novel design of an angular multiplexed system that facilitates dynamic synthesis of predefined wave fields using a 3D diffractive optical element. In this system several angular projections of given far-field intensities are encoded in a single computer generated volume hologram (CGVH). A spatial light modulator (SLM) is used to modulate an impinging plane reference wave thus allowing a dynamic decoding of individual projections. This also facilitates decoding a linear combination of various projections and can therefore be applied to synthesize wave fields with a much higher spatial-band-width-product as compared to conventional 2D static diffraction optical elements. We propose a 3D laser lithography based fabrication of these holograms in polymers and have thus incorporated corresponding fabrication constraints in the design process. Through numerical simulation of propagation through the system, initial feasibility studies have been undertaken. The obtained results show superior properties in terms of diffraction efficiency and angular selectivity as compared to cascaded optical elements.