A plasmonic perfect absorber enhanced longwave infrared quantum dot infrared photodetector with high quantum efficiency. (27th February 2017)

• Record Type: Journal Article
• Authors: Lu, Xuejun; Vaillancourt, Jarrod; Gu, Guiru
• Is Part Of: Journal of physics. Volume 50:Number 13(2017)
• Publication Date: 2017-02-27
• Subjects: plasmonics -- quantum dot -- longwave infrared -- high quantum efficiency; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aa5126
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: In this paper, we report a quantum dot infrared photodetector (QDIP) embedded in a plasmonic perfect absorber (PPA) cavity designed at the plasmonic resonant wavelength of 8.2 µ m. The reflection spectra and the electric-field are simulated and found to have strong confinement at the resonant wavelength. The QDIP embedded in the PPA cavity was fabricated using our flip-chip bonding and fan-out reading based fabrication process. Strong photocurrent enhancement is observed at the resonant wavelength. Due to the PPA enhancement, a high quantum efficiency (QE) of 50% is achieved. The high QE QDIP demonstration indicates that the PPA enhancement is a promising approach to achieve high QE in QDIPs.