Fig. 2 | Nature Communications

Fig. 2

From: Ultrathin wide-angle large-area digital 3D holographic display using a non-periodic photon sieve

Fig. 2

Wide-angle large-area holographic display using non-periodic photon sieve. a Scheme of the system. The non-periodic photon sieve increases the diffraction angles of transmitting light. A one-to-one correspondence between SLM pixels and pinholes allows independent modulation of the optical field transmitted from each pinhole. b Photograph of the system. The pinholes are placed close to the transmissive SLM to maintain the small form factor. c Micrographs from a scanning electron microscope of the non-periodic photon sieve fabricated using conventional photolithography. The diffraction angles of the transmitting light field vary according to the pinhole size. d Intensity profile of light transmitted through the non-periodic photon sieve. The size of the pinholes in the photon sieve is 2.2 μm. The distance between the image plane and the photon sieve is 10 mm. e Spatial frequency map corresponding to the intensity pattern of the image in d. The dashed circle indicates the numerical aperture corresponding to the viewing angle of 30 degrees. f Scheme of dynamic optical focusing over a wide volume. Optical focus is generated at arbitrary positions by displaying optimal patterns at the LCD panel. A 4-f telescopic imaging system (NA = 0.75) is mounted on a movable stage to capture images. g, h The size and shape of the focus vary according to its position because the addressable transversal wave vector depends on the displaying geometry. Effective viewing angles of the foci were examined from the size of the foci

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