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O: Fachverband Oberflächenphysik

O 91: Plasmonics and Nanooptics V: Waveguides and Antennas

O 91.9: Vortrag

Freitag, 31. März 2023, 12:30–12:45, CHE 89

Nanoantenna Electro-Optical-Transducer Utilizing Monolayer WSe₂ — •Patrick Pertsch, René Kullock, Monika Emmerling, Romana Ganser, and Bert Hecht — NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Am Hubland, 97074 Würzburg, Germany

Using light for the communication on computer chips could decrease the power consumption and increase the data bandwidth [1]. To this end, transition-metal-dichalcogenides (TMD), and especially monolayers thereof, are a very promising material class, because they can be used in electronic computing [2] as well as in optical applications [3].
To achieve high integration densities of logical elements, the transducers between electronic and optical signals should be of the same size as the nanoscale transistors used in modern electronics. But so far the photodetectors and emitters based on TMDs are usually much larger.

By combining TMDs with plasmonic nanostructures, the size of the optical elements can be decreased due to the large absorption cross section afforded by the plasmonic nanoantennas. In this work, we demonstrate single plasmonic nanoantennas on monolayer WSe₂ acting as optically-active material. This combination allows to emit and detect light by using only one single nanoscale device.

[1] C. Sun, et. al., Nature 528, 534-538 (2015).

[2] C. Liu, et. al., Nat. Nanotechnol. 15, 545-557 (2020).

[3] Q. Wang, et. al., Nat. Nanotechnol. 7, 699-712 (2012).