Wang, Chih-ChungChih-ChungWangJIA-HAN LINagao, TadaakiTadaakiNagao2026-01-152026-01-152025-12-2814639076https://www.scopus.com/record/display.uri?eid=2-s2.0-105024411297&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/735330We propose a tungsten-based broadband resonator capable of achieving near-perfect solar absorption with suppressed radiative heat loss. Across the entire solar radiation spectrum, the absorber exhibits a spectrally integrated total solar absorptance of 95%. Taking into account the thermal emission under an operating temperature of 100 °C, the photothermal conversion efficiency remains as high as 92–93%. Using particle swarm optimization, the initial square-based structure is transformed into adjacent and closely packed strip structures with multiple lengths to achieve enhanced solar absorption. The analysis uses finite-difference time-domain simulations, considering light polarization, incident angle, and structural defects. We proposed a new metamaterial structure with multiple strips that are more efficient and have a simpler geometric structure, as compared to multilayer films, pyramids, or cone structures, which mostly exhibit substantial radiative heat losses. The structure is composed of a W/SiO2/W (metal–insulator–metal) configuration, with a surface nanostructure pattern composed of low-emissivity tungsten, with fabrication error-tolerant computational design.falsejournal article10.1039/d5cp03164h2-s2.0-105024411297