AI Article Synopsis
- Researchers have studied the absorption properties of thin films, specifically noting that a 20 nm thick pyrolyzed carbon (PyC) film can significantly enhance absorption rates when placed on a silicon nitride (SiN) membrane.
- The PyC film increases the absorption of the SiN membrane to 40% in the terahertz range, while the membrane alone is transparent.
- This discovery of broadband absorption in the PyC film could lead to advancements in the development of bolometric radiation detectors.
Article Abstract
Fifty percents absorption by thin film, with thickness is much smaller than the skin depth and optical thickness much smaller than the wavelength, is a well-known concept of classical electrodynamics. This is a valuable feature that has been numerously widely explored for metal films, while chemically inert nanomembranes are a real fabrication challenge. Here we report the 20 nm thin pyrolyzed carbon film (PyC) placed on 300 nm thick silicon nitride (SiN) membrane demonstrating an efficient broadband absorption in the terahertz and near infrared ranges. While the bare SiNmembrane is completely transparent in the THz range, the 20 nm thick PyC layer increases the absorption of the PyC coated SiNmembrane to 40%. The reflection and transmission spectra in the near infrared region reveal that the PyC film absorption persists to a level of at least 10% of the incident power. Such a broadband absorption of the PyC film opens new pathways toward broadband bolometric radiation detectors.
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| http://dx.doi.org/10.1088/1361-6528/ad4157 | DOI Listing |
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