Journal
NANOMATERIALS
Volume 13, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/nano13233028
Keywords
2D materials; dark excitons; metasurfaces; Purcell factor; directionality
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This study proposes a new hybrid platform to enhance the excitation and emission of dark excitons in transition metal dichalcogenides, offering distinct advantages for opto-electronic and valleytronic devices.
Thanks to their long lifetime, spin-forbidden dark excitons in transition metal dichalcogenides are promising candidates for storage applications in opto-electronics and valleytronics. To date, their study has been hindered by inefficient generation mechanisms and the necessity for elaborate detection schemes. In this work, we propose a new hybrid platform that simultaneously addresses both challenges. We study an all-dielectric metasurface with two symmetrically protected quasi-bound states in the continuum to enhance both the excitation and emission of dark excitons in a tungsten diselenide monolayer under normal light incidence. Our simulations show a giant photoluminescence signal enhancement (similar to 520) along with directional emission, thus offering distinct advantages for opto-electronic and valleytronic devices.
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