Projects per year
Abstract
Electronic states and their dynamics are of critical importance for electronic and optoelectronic applications. Here, various relevant electronic states in monolayer MoS2, such as multiple excitonic Rydberg states and free-particle energy bands are probed with a high relative contrast of up to >= 200 via broadband (from approximate to 1.79 to 3.10 eV) static third-harmonic spectroscopy (THS), which is further supported by theoretical calculations. Moreover, transient THS is introduced to demonstrate that third-harmonic generation can be all-optically modulated with a modulation depth exceeding approximate to 94% at approximate to 2.18 eV, providing direct evidence of dominant carrier relaxation processes associated with carrier-exciton and carrier-phonon interactions. The results indicate that static and transient THS are not only promising techniques for the characterization of monolayer semiconductors and their heterostructures, but also a potential platform for disruptive photonic and optoelectronic applications, including all-optical modulation and imaging.
Original language | English |
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Article number | 2107104 |
Number of pages | 7 |
Journal | Advanced Materials |
Volume | 34 |
Issue number | 3 |
Early online date | 23 Nov 2021 |
DOIs | |
Publication status | Published - 20 Jan 2022 |
MoE publication type | A1 Journal article-refereed |
Keywords
- electronic states
- monolayer transition metal dichalcogenides
- static third-harmonic spectroscopy
- third-harmonic generation
- transient third-harmonic spectroscopy
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FEMTOCHIP: FEMTOSECOND LASER ON A CHIP
Sun, Z., Li, D., Liu, P., Turunen, M., Das, S., Mohsen, A., Liapis, A. & Atalaia Rosa, J.
01/03/2021 → 29/02/2024
Project: EU: Framework programmes funding
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FAST: Ultrafast Data Production with Broadband Photodetectors for Active Hyperspectral Space Imaging
Sun, Z., Akkanen, S., Pajunpää, T., Cui, L., Nigmatulin, F. & Das, S.
01/01/2021 → 31/12/2023
Project: Academy of Finland: Other research funding
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NOIMO: Novel optical isolators to continue Moore's law in photonics integration
01/09/2020 → 31/08/2024
Project: Academy of Finland: Other research funding