论文标题
在成像应用中，无依赖角度的TM传输的超质材料过滤器
Hyperbolic Metamaterial Filter for Angle-independent TM-Transmission in Imaging Applications
论文作者
论文摘要
随着常规的窄带过滤器，随着入射光的角度变化，窄变速箱带的中心波长会发生较大的偏移。在这个项目中，我们设计和实验验证了一种超质超材料的Bragg堆栈，该堆栈消除或大大降低了TM极化束的传输带的这种含量依赖性依赖性（即分散）。该项目中开发的过滤器由垂直渗透在Bragg堆栈的介电层垂直渗透的亚波长大小的金属线组成。我们首先讨论这种结构有望最大程度地减少分散体的物理原因，然后我们进行了详细的电磁建模，概念验证结构的制造以及对结构的光学测试。该过滤器是通过CMOS制造技术制造的，并使用傅立叶转换红外光谱进行了光学表征。模拟和实验数据都表明，可以设计狭窄的带传输滤波器，以使TM极化入射光的传输峰的中心波长不会随着传入光束的入射角变化而变化。这些类型的窄带缺口过滤器已用于许多传感和成像应用中，包括遥感和高光谱成像。
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.
