Electrically reconfigurable micromirror gratings for direct spatial modulation of terahertz waves and hyperspectral terahertz imaging over a wide frequency range

电可重构微镜光栅，用于太赫兹波的直接空间调制和宽频率范围内的高光谱太赫兹成像

• 批准号: 458851938
• 负责人: Professor Dr. Marco Rahm
• 金额: --
• 依托单位: Lehrstuhl für Theoretische Elektrotechnik (MMT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/458851938?language=en
• 关键词: Electrically; reconfigurable; micromirror; gratings; direct

The project aims at the design, fabrication and theoretical andexperimental investigation of large-aperture, electrically tunable, directspatial terahertz wave modulators that enable hyperspectral imaging in a terahertzcoded aperture imaging spectroscope.The modulators are designed for frequencies between 0,5 THz und 2,5 THz and shall provide a spectral working bandwidth of about 1 THz within the desired frequency range. The pixels of the modulators shall be composed of an array of micromirrors with a length of at least 200 μm. Dependent on the inclination angle of the micromirrors, apixel of the modulator appears dark or bright. For spatial terahertzwave modulation, the micromirrors of the different pixels must beindividually switched by application of a bias voltage. In order todesign a large-aperture spatial terahertz wave modulator, it isnecessary to optimize both the design and the fabrication of suchmicromirror-based grating modulators. For this reason, it will be investigated ifthe integration of metasurfaces as transparent ground electrodes canimprove the modulation contrast within the frequency working range. In a further approach, grating modulation and metamaterial-based absorption will be combined to extend the frequency working range of the spatial terahertz wave modulator.Based on the project results, a large-aperture, spectrally wide-band spatial terahertz wave modulator will be devised and implemented. The large-aperture modulator willbe used for spatial light modulation in a coded aperture imagingspectroscope, with which spectrally wideband hyperspectral terahertzimaging with a bandwidth of 1 THz shall be demonstrated.

该项目旨在设计、制造大口径、电可调、直接空间太赫兹波调制器，并进行理论和实验研究，该调制器可在太赫兹编码孔径成像光谱仪中实现超光谱成像，设计频率在0.5 THz和2.5 THz之间，并应在所需频率范围内提供约1 THz的光谱工作带宽。调制器的像素应由长度至少为200 μm的微镜阵列组成。取决于微镜的倾斜角度，调制器的apixel呈现暗或亮。对于空间太赫兹波调制，不同像素的微镜必须通过施加偏置电压来单独切换。为了设计大口径空间太赫兹波调制器，需要对这种基于微镜的光栅调制器的设计和制作进行优化.因此，将超颖表面整合为透明接地电极，是否能改善频率工作范围内的调制对比度，将是研究的重点。在进一步的研究中，我们将光栅调制和超材料吸收相结合来扩展空间太赫兹波调制器的工作频率范围，并在此基础上设计和实现了一种大口径、宽光谱的空间太赫兹波调制器。该大孔径调制器将用于编码孔径成像光谱仪中的空间光调制，并将演示带宽为1 THz的光谱宽带超光谱太赫兹成像。