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• W2897577864 endingPage "34043" @default.
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• W2897577864 abstract "Integrating an absorbing thin film into a resonant cavity is the most practical way to achieve perfect absorption of light at a selected wavelength in the mid-to-far infrared, as required to target blackbody radiation or molecular fingerprints. The cavity is designed to resonate and enable perfect absorption in the film at the chosen wavelength lambda. However, in current state-of-the-art designs, a still large absorbing film thickness (lambda/50) is needed and tuning the perfect absorption wavelength over a broad range requires changing the cavity materials. Here, we introduce a new resonant cavity concept to achieve perfect absorption of infrared light in much thinner and thus really nanoscale films, with a broad wavelength tunability using a single set of cavity materials. It requires a nanofilm with giant refractive index and small extinction coefficient (found in emerging semi-metals, semi-conductors and topological insulators) backed by a transparent spacer and a metal mirror. The nanofilm acts both as absorber and multiple reflector for the internal cavity waves, which after escaping follow a fractal phasor trajectory. This enables a totally destructive optical interference for a nanofilm thickness more than 2 orders of magnitude smaller than lambda. With this remarkable effect, we demonstrate angle-insensitive perfect absorption in sub - lambda/100 bismuth nanofilms, at a wavelength tunable from 3 to 20 mu m." @default.
• W2897577864 created "2018-10-26" @default.
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• W2897577864 date "2018-12-14" @default.
• W2897577864 modified "2023-10-18" @default.
• W2897577864 title "Mid-to-far infrared tunable perfect absorption by a sub - λ/100 nanofilm in a fractal phasor resonant cavity" @default.
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• W2897577864 doi "https://doi.org/10.1364/oe.26.034043" @default.
• W2897577864 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30650834" @default.
• W2897577864 hasPublicationYear "2018" @default.
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