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Holographic image generation with a thin-film resonance caused by chalcogenide phase-change material

机译:由硫族化物相变材料引起的具有薄膜共振的全息图像生成

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摘要

The development of digital holography is anticipated for the viewing of 3D images by reconstructing both the amplitude and phase information of the object. Compared to analog holograms written by a laser interference, digital hologram technology has the potential to realize a moving 3D image using a spatial light modulator. However, to ensure a high-resolution 3D image with a large viewing angle, the hologram panel requires a near-wavelength scale pixel pitch with a sufficient large numbers of pixels. In this manuscript, we demonstrate a digital hologram panel based on a chalcogenide phase-change material (PCM) which has a pixel pitch of 1 μm and a panel size of 1.6 × 1.6 cm2. A thin film of PCM encapsulated by dielectric layers can be used for the hologram panel by means of excimer laser lithography. By tuning the thicknesses of upper and lower dielectric layers, a color-selective diffraction panel is demonstrated since a thin film resonance caused by dielectric can affect to the absorption and diffraction spectrum of the proposed hologram panel. We also show reflection color of a small active region (1 μm × 4 μm) made by ultra-thin PCM layer can be electrically changed.
机译:通过重建物体的振幅和相位信息,可以预期数字全息技术的发展,以用于3D图像的观看。与通过激光干涉写入的模拟全息图相比,数字全息图技术具有使用空间光调制器实现移动3D图像的潜力。然而,为了确保具有大视角的高分辨率3D图像,全息面板需要具有足够大量像素的近波长尺度的像素间距。在本文中,我们演示了一种基于硫族化物相变材料(PCM)的数字全息面板,其像素间距为1μm,面板尺寸为1.6×1.6 cm 2 。可以通过准分子激光光刻将被介电层封装的PCM薄膜用于全息图面板。通过调整上下介电层的厚度,展示了一种选色衍射板,因为由电介质引起的薄膜共振会影响所提出的全息板的吸收和衍射光谱。我们还显示,超薄PCM层制成的小有源区(1μm×4μm)的反射颜色可以电改变。

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