不同於3D圖像,全息投影儀使觀察者能夠移動觀看,從各種角度獲得不同的透視效果
科學家基於創新技術製造低成本、高解析度全息影像
在此之前全息影像只出現在科幻電影中,最著名的就是《星球大戰》第一部中出現的莉亞公主的全息影像。當前移動全息圖像投影系統成本較高,並且存在著嚴重的局限性。
主要的問題在於空間光調製器,它能夠在三維空間中直接投射光線形成點,此外,當前技術、顯示尺寸關鍵因素、可視角度、幀頻和圖像深度都受到限制。
麻省理工學院的工程師研製一種新型空間光調製器,來克服以上存在的問題。這項最新研究報告發表在近期出版的《自然》雜誌上,聲稱能夠將科幻電影中的全息影像轉變成為現實。
科學家使用這種技術製造一種全息監控器,除了光源之外,設備成本不足500美元。麥可-波維(Michael Bove)博士是研究負責人,他說:「目前我們正在探索基於一些設備的顯示裝置,例如:小型計算機驅動全息影像顯示器,採用專用硬體的寬度超過0.5米顯示設備。很可能我們將通過全息視頻監控器呈現全色彩、標準視頻解析度圖像,具有30赫茲刷新率。」
不同於3D圖像,全息投影儀能夠使觀眾處於移動狀態觀看,從各個角度獲得不同透視效果。(生物谷Bioon.com)
生物谷推薦英文摘要:
Nature doi:10.1038/nature12217
Anisotropic leaky-mode modulator for holographic video displays
D. E. Smalley, Q. Y. J. Smithwick, V. M. Bove, J. Barabas & S. Jolly
Every holographic video display is built on a spatial light modulator, which directs light by diffraction to form points in three-dimensional space. The modulators currently used for holographic video displays are challenging to use for several reasons: they have relatively low bandwidth, high cost, low diffraction angle, poor scalability, and the presence of quantization noise, unwanted diffractive orders and zero-order light. Here we present modulators for holographic video displays based on anisotropic leaky-mode couplers, which have the potential to address all of these challenges. These modulators can be fabricated simply, monolithically and at low cost. Additionally, these modulators are capable of new functionalities, such as wavelength division multiplexing for colour display. We demonstrate three enabling properties of particular interest—polarization rotation, enlarged angular diffraction, and frequency domain colour filtering—and suggest that this technology can be used as a platform for low-cost, high-performance holographic video displays.