Color Separation through Spectrally-Selective Optical Funneling

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• 作者：Dimitrios L. Sounas ; Andrea Alù
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：3
• 期：4
• 页码：620-626
• 全文大小：538K
• 年卷期：0
• ISSN：2330-4022

文摘

We present the concept and a basic design for a free-space color sorter, which can efficiently separate different spectral components of an optical beam. The structure is based on a resonant cavity formed between a metallic wall and a stack of partially reflecting screens. Such a cavity supports multiple leaky-wave resonances, which enable spectrally selective funneling of the incident beam through apertures in the metallic wall. The apertures are coupled to resonators with different resonance frequencies that allow separating different spectral components of the beam. The proposed concept can potentially overcome the efficiency limitations of color filter arrays, with important consequences in the design of fast and efficient spectral imaging systems.