Title: FOS: A fully integrated open-source program for Fast Optical Spectrum calculations of nanoparticle media Show Chinese title

Title: FOS：用于纳米粒子介质快速光学谱计算的完全集成开源程序

Abstract: FOS, which means light in Greek, is an open-source program for Fast Optical Spectrum calculations of nanoparticle media. This program takes the material properties and a description of the system as input, and outputs the spectral response including the reflectance, absorptance, and transmittance. Previous open-source codes often include only one portion of what is needed to calculate the spectral response of a nanoparticulate medium, such as Mie theory or a Monte Carlo method. FOS is designed to provide a convenient fully integrated format to remove the barrier as well as providing a significantly accelerated implementation with compiled Python code, parallel processing, and pre-trained machine learning predictions. This program can accelerate optimization and high throughput design of optical properties of nanoparticle or nanocomposite media, such as radiative cooling paint and solar heating liquids, allowing for the discovery of new materials and designs. FOS also enables convenient modeling of lunar dust coatings, combustion particulates, and many other particulate systems. In this paper we discuss the methodology used in FOS, features of the program, and provide four case studies. Show Chinese abstract

Abstract: FOS 在希腊语中意为光，是一种用于计算纳米粒子介质光学频谱的开源程序。 该程序以材料属性和系统描述作为输入，并输出包括反射率、吸收率和透射率在内的光谱响应。 以往的开源代码通常只包含计算纳米粒子介质光谱响应所需内容的一部分，例如 Mie 理论或蒙特卡罗方法。 FOS 被设计为提供一种方便且完全集成的格式，去除障碍的同时通过编译后的 Python 代码、并行处理以及预训练的机器学习预测实现显著加速。 该程序能够加速纳米粒子或纳米复合介质（如辐射冷却涂料和太阳能加热液体）光学性质的优化和高通量设计，从而发现新材料和新设计。 FOS 还能方便地模拟月球尘埃涂层、燃烧颗粒以及其他许多颗粒系统。 本文讨论了 FOS 中使用的计算方法、程序特性，并提供了四个案例研究。