The stability and emissivity of the online calibration blackbody used in high-precision infrared remote sensing detectors in extreme environments are the primary limiting factors for their measurement accuracy. Due to the limitations of microstructure size effects, traditional calibration extended area blackbody cannot achieve an optimal balance between emissivity and stability, thus hindering further improvement in infrared remote sensing accuracy. This work proposes a new method that utilize suppressing near-field backscattering to control far-field reflectance. Specifically, through simultaneously reducing backscattering intensity and the backscattering solid angle, the reflectance is significantly reduced to an extremely low limit, which is validated through numerical simulations. Additionally, by combining the femtosecond laser self-convergent processing technique, the spontaneous energy negative feedback mechanism during femtosecond laser processing is utilized to achieve the fabrication of a high emissivity, thermally stable, mechanically stable, and highly uniform extended area blackbody. The blackbody fabricated using this technique can be applied for online calibration in various extreme environments, significantly improving measurement accuracy and service life.
Strong suppression of the photonic density of states in three-dimensional disordered silicon networks
University of Fribourg（弗里堡大学）；Université Côte d’Azur（蔚蓝海岸大学）；CNRS, Institut de Physique de Nice – INPHYNI（法国国家科学研究中心，尼斯物理研究所-INPHYNI）；Optoelectronics Research Centre, University of Southampton（南安普顿大学光电研究中心）
Metamaterial control of stimulated Brillouin scattering
使用完整的光声数值模拟，我们证明了增强和抑制的SBS增益的超材料，包括一个亚波长立方阵列的介电球悬浮在介电背景材料。我们开发了一个一般的理论框架，并提出了几个数值例子，使用技术上重要的材料。对于硅中的As $_2$ S $_3$球，与纯硅相比，我们实现了超过一个数量级的增益增强，并且对于硅中的GaAs球，获得了完全抑制。As $_2$ S $_3$玻璃的增益也可以通过嵌入二氧化硅球来强烈抑制。示出的增益系数的组成项依赖于在一个复杂的方式上的填充分数。我们发现电致伸缩是体相介质中SBS控制的主要效应。
Raman suppression in nanophotonics enabled by multimode spectral filtering
John A. Paulson School of Engineering and Applied Sciences, Harvard University（哈佛大学约翰·A·保尔森工程与应用科学学院）；Quantum Science and Engineering, Harvard University（哈佛大学量子科学与工程）；Department of Physics, University of Auckland（奥克兰大学物理系）；The Dodd-Walls Centre for Photonic and Quantum Technologies（多德-沃尔斯光子与量子技术中心）
