| Autor: |
Edelstein, Shahar, Indukuri, S. R. K. Chaitanya, Mazurski, Noa, Levy, Uriel |
| Předmět: |
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| Zdroj: |
Nanophotonics (21928606); Sep2022, Vol. 11 Issue 19, p4337-4345, 9p |
| Abstrakt: |
Novel 2D van der Waals semiconductors facilitate the formation of heterostructures and thus support bandgap engineering for atomically thin modern photonic applications. When these heterostructures form a type II band structure, interlayer excitons (ILEs) are formed as a result of the ultrafast charge transfer between the layers. Here, we present for the first time a waveguide-coupled, mid-IR photodetector and modulator based on the ILE absorption. The device consists of a heterostructure of a single layer of tungsten disulfide (WS2) and a few layers of hafnium disulfide (HfS2) integrated to a silicon waveguide on a sapphire substrate. We measure broadband mid-IR photodetection (3.8–5.5 µm) with responsivity in the order of tens of µA/W and with no significant effect on the waveguide's transmission. Additionally, we demonstrate waveguide-integrated, mid-IR, all-optical modulation by controlling the ILE population with the interband transition of the individual layers of the heterostructure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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