Study on design and fabrication method of mirror array for dihedral corner reflector array with height distribution

Abstract

In this study, we proposed a mirror array with a mirror height distribution in a dihedral corner reflector array (DCRA) to expand the viewing angle in the elevation direction of floating images. We developed a design criteria of the height distribution for three design requirements, (i) in the case of that there are no restrictions on the type of height, (ii) in the case of that there are restrictions on the type of height, (iii) minimum height specified. We have shown that these design can achieve large viewing angle in elevation direction compared to that of conventional DCRA with constant height. We also studied the fabrication method of DCRA with height distribution. In detail, we fabricated a multi-stage pillar with a two-stage height distribution using photolithography technology and evaluated the shapes.