볼로미터형 테라헤르츠 센서의 광학적 특성 연구
Optical Characteristics of Bolometric Terahertz Sensor
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The optical characteristics of a terahertz (THz) antenna-coupled bolometer (ACB) detector were evaluated using a pulsed quantum cascade laser (QCL) and radiation blackbody sources. We investigated a method for measuring the responsivity and noise-equivalent power (NEP) of the THz detector using two different types of light sources. When using a QCL source with a frequency of 3 THz, the average responsivity of 24 devices was 1.44× 103 V/W and the average NEP of those devices was 3.33× 10-9 W/ Hz. The average responsivity and NEP as measured by blackbody source were 1.79× 105 V/W and6.51× 10-11 W/ Hz, respectively, with the measured values varying depending on the light source. This was because the out-put power of each light source was different, with the laser source being driven by a pulse type wave and the blackbodysource being driven by a continuous wave. The power input to the THz sensor was also different. Futhermore, the respon- sivity and NEP values measured using band pass filter (BPF) were similar to those measured when using only THz windows. It was found that ACB sensor responds normally in the THz region to both the laser and the blackbody source, and the method was confirmed to effectively evaluate the characteristics of the THz sensor.
Abstract
The optical characteristics of a terahertz (THz) antenna-coupled bolometer (ACB) detector were evaluated using a pulsed quantum cascade laser (QCL) and radiation blackbody sources. We investigated a method for measuring the responsivity and noise-equivalent power (NEP) of the THz detector using two different types of light sources. When using a QCL source with a frequency of 3 THz, the average responsivity of 24 devices was 1.44× 103 V/W and the average NEP of those devices was 3.33× 10-9 W/ Hz. The average responsivity and NEP as measured by blackbody source were 1.79× 105 V/W and6.51× 10-11 W/ Hz, respectively, with the measured values varying depending on the light source. This was because the out-put power of each light source was different, with the laser source being driven by a pulse type wave and the blackbodysource being driven by a continuous wave. The power input to the THz sensor was also different. Futhermore, the respon- sivity and NEP values measured using band pass filter (BPF) were similar to those measured when using only THz windows. It was found that ACB sensor responds normally in the THz region to both the laser and the blackbody source, and the method was confirmed to effectively evaluate the characteristics of the THz sensor.
참고문헌 (13)
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