Ultra-broadband photodetectors based on epitaxial graphene quantum dots
Graphene is an ideal material for hot-electron bolometers due to its low heat capacity and weak electron-phonon coupling. Nanostructuring graphene with quantum-dot constrictions yields detectors of electromagnetic radiation with extraordinarily high intrinsic responsivity, higher than 1×109 V W−1 at...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2018-03-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2017-0100 |
| _version_ | 1828919898625015808 |
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| author | El Fatimy Abdel Nath Anindya Kong Byoung Don Boyd Anthony K. Myers-Ward Rachael L. Daniels Kevin M. Jadidi M. Mehdi Murphy Thomas E. Gaskill D. Kurt Barbara Paola |
| author_facet | El Fatimy Abdel Nath Anindya Kong Byoung Don Boyd Anthony K. Myers-Ward Rachael L. Daniels Kevin M. Jadidi M. Mehdi Murphy Thomas E. Gaskill D. Kurt Barbara Paola |
| author_sort | El Fatimy Abdel |
| collection | DOAJ |
| description | Graphene is an ideal material for hot-electron bolometers due to its low heat capacity and weak electron-phonon coupling. Nanostructuring graphene with quantum-dot constrictions yields detectors of electromagnetic radiation with extraordinarily high intrinsic responsivity, higher than 1×109 V W−1 at 3 K. The sensing mechanism is bolometric in nature: the quantum confinement gap causes a strong dependence of the electrical resistance on the electron temperature. Here, we show that this quantum confinement gap does not impose a limitation on the photon energy for light detection and these quantum-dot bolometers work in a very broad spectral range, from terahertz through telecom to ultraviolet radiation, with responsivity independent of wavelength. We also measure the power dependence of the response. Although the responsivity decreases with increasing power, it stays higher than 1×108 V W−1 in a wide range of absorbed power, from 1 pW to 0.4 nW. |
| first_indexed | 2024-12-13T21:35:54Z |
| format | Article |
| id | doaj.art-e703dd67b0f246399783c493f89760b9 |
| institution | Directory Open Access Journal |
| issn | 2192-8606 2192-8614 |
| language | English |
| last_indexed | 2024-12-13T21:35:54Z |
| publishDate | 2018-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-e703dd67b0f246399783c493f89760b92022-12-21T23:30:41ZengDe GruyterNanophotonics2192-86062192-86142018-03-017473574010.1515/nanoph-2017-0100nanoph-2017-0100Ultra-broadband photodetectors based on epitaxial graphene quantum dotsEl Fatimy Abdel0Nath Anindya1Kong Byoung Don2Boyd Anthony K.3Myers-Ward Rachael L.4Daniels Kevin M.5Jadidi M. Mehdi6Murphy Thomas E.7Gaskill D. Kurt8Barbara Paola9Department of Physics, Georgetown University, Washington, DC 20057, USAU.S. Naval Research Laboratory, Washington, DC 20375, USAU.S. Naval Research Laboratory, Washington, DC 20375, USAU.S. Naval Research Laboratory, Washington, DC 20375, USAU.S. Naval Research Laboratory, Washington, DC 20375, USAU.S. Naval Research Laboratory, Washington, DC 20375, USAInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USAInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USAU.S. Naval Research Laboratory, Washington, DC 20375, USADepartment of Physics, Georgetown University, Washington, DC 20057, USAGraphene is an ideal material for hot-electron bolometers due to its low heat capacity and weak electron-phonon coupling. Nanostructuring graphene with quantum-dot constrictions yields detectors of electromagnetic radiation with extraordinarily high intrinsic responsivity, higher than 1×109 V W−1 at 3 K. The sensing mechanism is bolometric in nature: the quantum confinement gap causes a strong dependence of the electrical resistance on the electron temperature. Here, we show that this quantum confinement gap does not impose a limitation on the photon energy for light detection and these quantum-dot bolometers work in a very broad spectral range, from terahertz through telecom to ultraviolet radiation, with responsivity independent of wavelength. We also measure the power dependence of the response. Although the responsivity decreases with increasing power, it stays higher than 1×108 V W−1 in a wide range of absorbed power, from 1 pW to 0.4 nW.https://doi.org/10.1515/nanoph-2017-0100graphenehot-electron bolometersquantum dots |
| spellingShingle | El Fatimy Abdel Nath Anindya Kong Byoung Don Boyd Anthony K. Myers-Ward Rachael L. Daniels Kevin M. Jadidi M. Mehdi Murphy Thomas E. Gaskill D. Kurt Barbara Paola Ultra-broadband photodetectors based on epitaxial graphene quantum dots Nanophotonics graphene hot-electron bolometers quantum dots |
| title | Ultra-broadband photodetectors based on epitaxial graphene quantum dots |
| title_full | Ultra-broadband photodetectors based on epitaxial graphene quantum dots |
| title_fullStr | Ultra-broadband photodetectors based on epitaxial graphene quantum dots |
| title_full_unstemmed | Ultra-broadband photodetectors based on epitaxial graphene quantum dots |
| title_short | Ultra-broadband photodetectors based on epitaxial graphene quantum dots |
| title_sort | ultra broadband photodetectors based on epitaxial graphene quantum dots |
| topic | graphene hot-electron bolometers quantum dots |
| url | https://doi.org/10.1515/nanoph-2017-0100 |
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