Presentation Information

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8a-A24-3]Determination of Relaxation Times Using Frequency Modulation in a Josephson Plasma Emitter

〇Keisuke Mizoguchi¹, Keitaro Sugimoto¹, Masashi Miyamoto¹, Ryota Kobayasi¹, Manabu Tsujimoto², Itsuhiro Kakeya¹ (1.Kyoto univ., 2.AIST)

Keywords:

Superconductivity,Josephson effect,Frequency Modulation

A Josephson plasma emitter using the copper oxide high-temperature superconductor Bi2212 emits terahertz waves through the synchronization of intrinsic Josephson junctions. In frequency modulation achieved by superimposing a high-frequency signal on the bias voltage, the spectrum becomes asymmetric when the center frequency is close to the lower limit of the oscillation region; however, as the modulation frequency increases, the signal returns to within the region before the synchronization relaxation is complete, causing the spectrum to approach symmetry. This study reports the results of a quantitative evaluation of the synchronization relaxation time using this modulation frequency dependence.

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