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Accurate Measurement of Absolute Terahertz Power Using Broadband Calorimeter

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Abstract

This paper presents a highly sensitive terahertz (THz) calorimeter developed using a magnetically loaded epoxy as a broadband absorber. The reflection loss of the absorber, which has a pyramidally textured surface, is less than 0.04, as determined using a THz time-domain spectrometer and a vector network analyzer. The THz calorimeter successfully enabled the measurement of the absolute THz power from a photomixer at microwatt levels at room temperature. The measurement uncertainties at a 95% confidence level were 6.2% for 13 μW at 300 GHz and 5.6% for 1.5 μW at 1 THz, respectively. Details of the evaluation and uncertainty analyses are also presented.

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Acknowledgements

The authors would like to thank Y. Kato and M. Horibe of the National Institute of Advanced Industrial Science and Technology for their support in the VNA measurements.

Funding

This work was supported by JSPS KAKENHI (Grant Number JP16K06403).

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Authors and Affiliations

  1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    Hitoshi Iida, Moto Kinoshita & Kuniaki Amemiya

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  1. Hitoshi Iida
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  2. Moto Kinoshita
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  3. Kuniaki Amemiya
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Correspondence to Hitoshi Iida.

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Iida, H., Kinoshita, M. & Amemiya, K. Accurate Measurement of Absolute Terahertz Power Using Broadband Calorimeter. J Infrared Milli Terahz Waves 39, 409–421 (2018). https://doi.org/10.1007/s10762-018-0477-3

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  • DOI: https://doi.org/10.1007/s10762-018-0477-3

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