Reference black-body radiation source for emissivity measurements on the frequency range 3–30 THz

The emergence of radiation sources in different frequency ranges fuels the demand for techniques for spectrally resolved calibrations of their intensity. Thermal radiation of a perfectly absorbing object (black-body radiation) is used as an etalon in the near-infrared–visible ranges. However, to date, no suitable material exists as a reference for thermal radiation in the frequency range 3–30 THz. In this work, we demonstrate a thermal source that can serve a broad THz frequency range. We employ a moth-eye-structured silicon coated with conductive graphitic film exhibiting absorbance above 99.5%. By using the thermal emission of a silicon-based Salisbury screen heated at a temperature of 60 °C we demonstrate that the moth-eye structure can be used for calibrating THz devices. We also show that the developed approach may allow one to engineer the spectrum of the frequency comb source using a two-layer heterostructure.

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Publication Details

Journal
Applied Physics Letters
Published
2025-09-01
DOI
https://doi.org/10.1063/5.0288839
Citations
1
Primary Topic
Calibration and Measurement Techniques
Type
article
Field-Weighted Citation Impact
4.99

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article

Reference black-body radiation source for emissivity measurements on the frequency range 3–30 THz

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1 citations
Applied Physics Letters
Calibration and Measurement Techniques
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article

Reference black-body radiation source for emissivity measurements on the frequency range 3–30 THz

Yuri Svirko, Kuniaki Konishi, Haruyuki Sakurai, Aleksandr S. Saushin, P. Kuzhir, Maria Cojocari, Isaac Appiah Otoo, Irmantas Kašalynas, Georgy Fedorov, Petri Karvinen, Shotaro Kawano, Yuki Hakamada, Mikhail Gorbun, Janna Penanen
article en
1 citations

Abstract

The emergence of radiation sources in different frequency ranges fuels the demand for techniques for spectrally resolved calibrations of their intensity. Thermal radiation of a perfectly absorbing object (black-body radiation) is used as an etalon in the near-infrared–visible ranges. However, to date, no suitable material exists as a reference for thermal radiation in the frequency range 3–30 THz. In this work, we demonstrate a thermal source that can serve a broad THz frequency range. We employ a moth-eye-structured silicon coated with conductive graphitic film exhibiting absorbance above 99.5%. By using the thermal emission of a silicon-based Salisbury screen heated at a temperature of 60 °C we demonstrate that the moth-eye structure can be used for calibrating THz devices. We also show that the developed approach may allow one to engineer the spectrum of the frequency comb source using a two-layer heterostructure.

Applied Physics LettersVol. 127(9)
University of Eastern Finland (FI), Center for Physical Sciences and Technology (LT), The University of Tokyo (JP)
European Commission, Ministry of Education, Culture, Sports, Science and Technology, Academy of Finland, Japan Society for the Promotion of Science
Openalex Percentile: Top 5%
Calibration and Measurement Techniques
4.99
DOIOpen Access PDFOpenAlex
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