Takekawa Yoshitaka, Takashima Yuzuru, Takaki Yasuhiro
Opt Express. 2020 Mar 2;28(5):7392-7407. doi: 10.1364/OE.385645.
A one-micron pixel pitch is believed to be required for spatial light modulators (SLMs) to realize holographic displays possessing a wide viewing zone. This study proposes the use of a microelectromechanical systems (MEMS) SLM for not only displaying holographic patterns but also scanning laser beam. During the rotation of MEMS mirrors in the MEMS SLM, the timing of laser pulses illuminating the MEMS SLM is controlled to change the reflection direction of light modulated by the MEMS SLM in order to enlarge the viewing zone. In this technique, the width of the viewing zone depends on the rotation angle of MEMS mirrors, and not on the pitch of pixels (MEMS mirrors). We experimentally demonstrated the enlargement of the viewing zone angle to ∼40° using the MEMS SLM with a pixel pitch of 13.68 µm.
人们认为，空间光调制器（SLM）要实现具有宽视角的全息显示，像素间距需达到1微米。本研究提出使用微机电系统（MEMS）SLM，不仅用于显示全息图案，还用于扫描激光束。在MEMS SLM中MEMS镜旋转期间，控制照射MEMS SLM的激光脉冲的 timing，以改变由MEMS SLM调制的光的反射方向，从而扩大视角。在该技术中，视角的宽度取决于MEMS镜的旋转角度，而不取决于像素（MEMS镜）的间距。我们通过实验证明，使用像素间距为13.68 µm的MEMS SLM，视角可扩大到约40°。
