Probing THz intersubband absorption using Johnson noise thermometry
We investigate the THz intersubband absorption behavior of a single 40-nm wide GaAs/AlGaAs square quantum well (QW) using Johnson noise thermometry. In our measurements, the Johnson noise associated with intersubband absorption is measured from the in-plane conduction channel of the QW while its int...
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| Language: | English |
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De Gruyter
2024-02-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2023-0752 |
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| author | Yoo Changyun Sherwin Mark S. West Kenneth W. Pfeiffer Loren N. Kawamura Jonathan H. Karasik Boris S. |
| author_facet | Yoo Changyun Sherwin Mark S. West Kenneth W. Pfeiffer Loren N. Kawamura Jonathan H. Karasik Boris S. |
| author_sort | Yoo Changyun |
| collection | DOAJ |
| description | We investigate the THz intersubband absorption behavior of a single 40-nm wide GaAs/AlGaAs square quantum well (QW) using Johnson noise thermometry. In our measurements, the Johnson noise associated with intersubband absorption is measured from the in-plane conduction channel of the QW while its intersubband absorption behavior is being tuned through the independent control of the charge density and the perpendicular DC electric field. Our measurements enable the study of intersubband absorption of a small (∼20,000 and potentially fewer) number of electrons in a single mesoscopic device, as well as direct measurement of the electron heating from intersubband absorption. By measuring the Johnson noise response to monochromatic THz radiation at 2.52 THz and 4.25 THz at 20 K as a function of the DC electric field over a wide range of charge density, we show that the observed Johnson noise behavior correlates well with the expected intersubband absorption of the 40-nm QW. To explain the absorption features of the experimental results, we model the data by calculating the THz coupling efficiency based on the impedance model for intersubband absorption, which qualitatively reproduces the observed Johnson noise behavior well. Based on the temperature calibration of the Johnson noise measured at 2.52 THz, we deduce an increase in the electron temperature ΔT
e of ∼35
${\sim} 35$
K when the maximum absorption of THz power occurs in the device. |
| format | Article |
| id | doaj-art-4808b3f5bfb74ed9a9f63cfd787671b3 |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-02-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-4808b3f5bfb74ed9a9f63cfd787671b32024-11-25T11:19:11ZengDe GruyterNanophotonics2192-86142024-02-0113101711172310.1515/nanoph-2023-0752Probing THz intersubband absorption using Johnson noise thermometryYoo Changyun0Sherwin Mark S.1West Kenneth W.2Pfeiffer Loren N.3Kawamura Jonathan H.4Karasik Boris S.5Jet Propulsiton Laboratory, California Institute of Technology, Pasadena, CA, USAUniversity of California, Santa Barbara, CA, USAPrinceton University, Princeton, NJ, USAPrinceton University, Princeton, NJ, USAJet Propulsiton Laboratory, California Institute of Technology, Pasadena, CA, USAJet Propulsiton Laboratory, California Institute of Technology, Pasadena, CA, USAWe investigate the THz intersubband absorption behavior of a single 40-nm wide GaAs/AlGaAs square quantum well (QW) using Johnson noise thermometry. In our measurements, the Johnson noise associated with intersubband absorption is measured from the in-plane conduction channel of the QW while its intersubband absorption behavior is being tuned through the independent control of the charge density and the perpendicular DC electric field. Our measurements enable the study of intersubband absorption of a small (∼20,000 and potentially fewer) number of electrons in a single mesoscopic device, as well as direct measurement of the electron heating from intersubband absorption. By measuring the Johnson noise response to monochromatic THz radiation at 2.52 THz and 4.25 THz at 20 K as a function of the DC electric field over a wide range of charge density, we show that the observed Johnson noise behavior correlates well with the expected intersubband absorption of the 40-nm QW. To explain the absorption features of the experimental results, we model the data by calculating the THz coupling efficiency based on the impedance model for intersubband absorption, which qualitatively reproduces the observed Johnson noise behavior well. Based on the temperature calibration of the Johnson noise measured at 2.52 THz, we deduce an increase in the electron temperature ΔT e of ∼35 ${\sim} 35$ K when the maximum absorption of THz power occurs in the device.https://doi.org/10.1515/nanoph-2023-0752thz intersubband transitionsjohnson noise thermometrytunable antenna-coupled intersubband terahertz (tacit) mixer |
| spellingShingle | Yoo Changyun Sherwin Mark S. West Kenneth W. Pfeiffer Loren N. Kawamura Jonathan H. Karasik Boris S. Probing THz intersubband absorption using Johnson noise thermometry Nanophotonics thz intersubband transitions johnson noise thermometry tunable antenna-coupled intersubband terahertz (tacit) mixer |
| title | Probing THz intersubband absorption using Johnson noise thermometry |
| title_full | Probing THz intersubband absorption using Johnson noise thermometry |
| title_fullStr | Probing THz intersubband absorption using Johnson noise thermometry |
| title_full_unstemmed | Probing THz intersubband absorption using Johnson noise thermometry |
| title_short | Probing THz intersubband absorption using Johnson noise thermometry |
| title_sort | probing thz intersubband absorption using johnson noise thermometry |
| topic | thz intersubband transitions johnson noise thermometry tunable antenna-coupled intersubband terahertz (tacit) mixer |
| url | https://doi.org/10.1515/nanoph-2023-0752 |
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