Abstract
Efficient photodetectors that can be easily engineered for a specific spectral window are of high interest. Here, we report on the design, fabrication, and characterization of metasurface-enhanced photodetectors and photodiodes using colloidal quantum dots. We fabricate photoconductors optimized for the wavelength range around 1550 nm featuring responsivities of up to 8000 A/W with low noise equivalent powers on the order of tens of pW/Hz. Further, we produce photodiodes with responsivities of ∼5 mA/W that offer faster responses (14 μs rise time). The high responsivities are due to the metasurface, which increases the absorption by a factor of 10 compared to that of a quantum dot thin film of the same thickness and a structure that enables a photo-gain. We introduce a metasurface to detect either of the two orthogonal polarizations. The fabricated photoconductors operate at low voltages (1-5 V), making them compatible with the complementary metal-oxide-semiconductor (CMOS) read-out circuitry. Show more
Publication status
publishedExternal links
Journal / series
ACS PhotonicsVolume
Pages / Article No.
Publisher
American Chemical SocietySubject
metamaterials; photodetectors; plasmonics; quantum dotsOrganisational unit
03974 - Leuthold, Juerg / Leuthold, Juerg
02635 - Institut für Elektromagnetische Felder / Electromagnetic Fields Laboratory
02140 - Dep. Inf.technologie und Elektrotechnik / Dep. of Inform.Technol. Electrical Eng.
09701 - Yarema, Maksym / Yarema, Maksym
03895 - Wood, Vanessa / Wood, Vanessa
Funding
670478 - Plasmonic-Silicon-Organic Hybrid – a Universal Platform for THz Communications (EC)
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