Phase-Modulated Axilenses As Ultracompact Spectroscopic Tools
Phase-Modulated Axilenses As Ultracompact Spectroscopic Tools
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DOI：
10.1021/acsphotonics.0c00762
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发表时间：
2020-03
期刊：
影响因子：
7
通讯作者：
W. Britton;Yuyao Chen;F. Sgrignuoli;L. Dal Negro
中科院分区：
文献类型：
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作者：
W. Britton;Yuyao Chen;F. Sgrignuoli;L. Dal Negro
我们设计和表征相位调制，超紧凑，硅基axilens设备，联合收割机结合有效的点聚焦和光栅选择性内可扩展的4级相位掩模配置。所提出的设计是偏振不敏感的，并保持在一个广泛的光谱带大的聚焦效率。具体来说，我们选择和系统地表征设计用于可见光和近红外（NIR）操作在750 nm-950 nm $波长范围内的结构。这些器件非常适合单片集成在焦平面阵列（FPA）的衬底层上，用于多波段光电探测和成像。我们演示了线性控制的多波长聚焦在一个单一的消色差平面，并提供了一个应用程序组成的概念验证超紧凑的单透镜光谱仪只有300 nm的厚度和70${\mu}m$的直径，实现最小可分辨波长$\Delta\lambda= 40 nm $在$\Delta_0 = 850 nm $。所提出的设备增加了基本的光谱能力，紧凑的成像设备的应用范围从光谱分选可见和近红外多光谱成像和检测。
We design and characterize phase-modulated, ultra-compact, silicon-based axilens devices that combine efficient point focusing and grating selectivity within scalable 4-level phase mask configurations. The proposed designs are polarization insensitive and maintain a large focusing efficiency over a broad spectral band. Specifically, we select and systematically characterize structures designed for visible and near-infrared (NIR) operation in the $750nm-950nm$ wavelength range. These devices are ideally suited for monolithic integration atop the substrate layers of focal plane arrays (FPAs) for use in multi-band photo-detection and imaging. We demonstrate linear control of multi-wavelength focusing on a single achromatic plane and provide an application consisting of a proof-of-concept ultra-compact single-lens spectrometer with only 300 nm thickness and 70${\mu}m$ diameter, achieving a minimum distinguishable wavelength $\Delta\lambda=40nm$ at $\lambda_0=850nm$. The proposed devices add fundamental spectroscopic capabilities to compact imaging devices for a number of applications ranging from spectral sorting to visible and NIR multispectral imaging and detection.