| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a time-domain spectroscopic device capable of improving the sensitivity of detecting a terahertz wave.SOLUTION: A time-domain spectroscopic device comprises: a terahertz wave generation unit 4 of photoconduction type for generating a terahertz wave Th by a pump light LP1 and irradiating a sample S with the generated terahertz wave Th; and a terahertz wave detection unit 5 of photoconduction type for detecting the terahertz wave Th that transmitted the sample S by a probe light LP2. Each of the terahertz wave generation unit 4 and the terahertz wave detection unit 5 has a photoconduction layer 53a, 53b comprising an InGaAs (0≤X≤0.53) compound semiconductor containing a quantum dot 62, the In ratio X of the photoconduction layer 53b of the terahertz wave detection unit 5 being smaller than the In ratio X of the photoconduction layer 53a of the terahertz wave generation unit 4.</p> |
