Germanium metasurface assisted broadband detectors

Abstract: The demand on broadband near-infrared photodetections with high responsivity is becoming increasingly eminent; however its realization remains a significant technological challenge. Here we design, fabricate, and characterize a broadband Ge photodetector (1000–1600 nm), composed of densely packed 230-nm-thick Ge disks of different diameters (255 nm, 320 nm, and 500 nm), placed on top of a 105-nm-thin Ge layer. Using experimentally measured and calculated transmission and absorption spectra, we demonstrate that the absorption and detector responsivity are increased by nearly 2 orders of magnitude, compared to the unstructured Ge photodetector, due to the excitation of magnetic dipole resonances in Ge disks, while preserving a relatively low dark current. Our approach is simple and can be easily adapted to other semiconductor material platforms and operation wavelengths to enable performance improvements of broadband photodetector devices.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Germanium metasurface assisted broadband detectors ; volume:12 ; number:12 ; year:2023 ; pages:2171-2177 ; extent:7 ; Nanophotonics ; 12, Heft 12 (2023), 2171-2177 (gesamt 7)

Contributors, Places and Time

• Creator: Yezekyan, Torgom ; Zenin, Vladimir A. ; Thomaschewski, Martin ; Malureanu, Radu ; Bozhevolnyi, Sergey

Further information

• DOI: 10.1515/nanoph-2023-0116
• URN: urn:nbn:de:101:1-2023061414313333795177
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 10:51 AM CEST