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arXiv 2201.05717physics.optics
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用于成像应用的角度无关TM传输的双曲超材料滤波器

Hyperbolic Metamaterial Filter for Angle-independent TM-Transmission in Imaging Applications

Golsa Mirbagheri

摘要:

对于传统的窄带滤光片,窄透射带的中心波长随着入射光角度的改变而经历大的偏移。在这个项目中,我们设计并实验验证了一种双曲超材料布拉格堆叠,它消除或大大减少了这种入射角依赖性(即,色散)。本计画所研制的滤波器是由垂直穿入布喇格堆叠介电层的亚波长尺寸金属线阵列所组成。我们首先讨论了为什么这样的结构有望最大限度地减少色散的物理原因,然后我们进行了详细的电磁建模,概念验证结构的制造和结构的光学测试。该滤波器是由CMOS制造技术和光学特性,使用傅里叶变换红外光谱。模拟和实验数据表明,窄带透射滤波器可以设计成使得TM偏振入射光的透射峰的中心波长不随入射光束的入射角改变而改变。这些类型的窄带陷波滤波器已被用于许多传感和成像应用,包括遥感和高光谱成像。

英文摘要:

With conventional narrowband filters, the center-wavelength of the narrow transmission band undergoes large shifts as the angle of incident light changes. In this project, we designed and experimentally verified a type of hyperbolic metamaterial Bragg stack that eliminates, or vastly reduces, this angle-of-incidence dependence (i.e., dispersion) of the transmission band for TM polarized beam. The filter developed in this project is composed of array of subwavelength sized metal wires vertically penetrating in the dielectric layers of the Bragg stack. We first discuss the physical reasons why such a structure is expected to minimize dispersion, then we performed detailed electromagnetic modeling, fabrication of proof-of-concept structures, and optical testing of the structures. The filter is fabricated by CMOS fabrication techniques and optical characterized using Fourier-transform infrared spectroscopy. Both simulated and experimental data show that narrow band transmission filters can be designed such that the center-wavelength of the transmission peak for TM polarized incident light does not change as the angle of incidence of an incoming beam changes. These types of narrowband notch filters have been used in many sensing and imaging applications, including remote sensing and hyperspectral imaging.

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