Accurate Measurement of Absolute Terahertz Power Using Broadband Calorimeter
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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.
KeywordsTerahertz power Calorimeter Broadband absorber Uncertainty
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.
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