Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings

TitleDesign of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings
Publication TypeJournal Article
Year of Publication2008
AuthorsHu XH, Li M, Ye Z, Leung WY, Ho KM, Lin SY
Journal TitleApplied Physics Letters
Volume93
Pages241108
Date Published12/15
ISBN Number0003-6951
Accession NumberISI:000261896400008
Keywordsdiffraction gratings, fabry-perot resonators, Gold, infrared photodetectors, light polarisation, mirrors, optical films, photodetectors, quantum dots
Abstract

We propose a metallic Fabry-Perot cavity with a Au grating and a Au film acting as two reflectors to enhance the field and absorption in the active detector region, leading to better performance of quantum-dot-based photodetectors at a wavelength of 10 mu m. One- and two-dimensional Au gratings are applied to achieve enhancement for polarized and unpolarized light, respectively. With optimizing grating parameters, the absorption can be enhanced by about 20 times in the active detector region compared to conventional photodetectors without the Au reflectors.

URL<Go to ISI>://000261896400008http://link.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=APPLAB000093000024241108000001
DOI10.1063/1.3052893