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Complementary split-ring resonator antenna coupled quantum dot infrared photodetector.
- Source :
-
Applied Physics Letters . 2/27/2017, Vol. 110 Issue 9, p1-5. 5p. 1 Diagram, 1 Chart, 2 Graphs. - Publication Year :
- 2017
-
Abstract
- We present a study of the performance enhancement of a quantum dot infrared photodetector (QDIP), by means of complementary split-ring resonator (CSRR) nano-antennae. The QDIP is based on an asymmetric heterostructure containing a single layer of self-assembled InAs/GaAs quantum dots (QDs). The proximity of the QD plane to the top contact layer is exploited for the coupling with the near-field of the CSRR modes. The co-existence of the CSRR LC mode, at λLC=7.4 lm, and of non-localized Bragg-like modes, is observed for the two-dimensional array of nano-antennae implemented on the QDIP. At λLC and a temperature T=10 K, the antenna coupled device is characterized by a responsivity of 44 μA/W and a specific detectivity D*=1.5×108Jones. For the highly localized LC mode, enhancements of a factor 1.7 in responsivity and 2.1 in specific detectivity are observed. Within the sub-wavelength LC mode effective surface, normalizing the overall response to the active surface of the detector, a responsivity enhancement of ~19 is estimated, showing the potentiality of this approach for the realization of high-performance QDIPs working at normal incidence. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 110
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 121512483
- Full Text :
- https://doi.org/10.1063/1.4977427