π-phase modulated monolayer supercritical lens
Qin, Fei Liu, Boqing Zhu, Linwei Lei, Jian Fang, Wei Hu, Dejiao Zhu, Yi Ma, Wendi Wang, Bowen Shi, Tan
Qin, Fei
Liu, Boqing
Zhu, Linwei
Lei, Jian
Fang, Wei
Hu, Dejiao
Zhu, Yi
Ma, Wendi
Wang, Bowen
Shi, Tan
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Abstract
The emerging monolayer transition metal dichalcogenides have provided an unprecedented material platform for miniaturized opto-electronic devices with integrated functionalities. Although excitonic light–matter interactions associated with their direct bandgaps have received tremendous research efforts, wavefront engineering is less appreciated due to the suppressed phase accumulation effects resulting from the vanishingly small thicknesses. By introducing loss-assisted singular phase behaviour near the critical coupling point, we demonstrate that integration of monolayer MoS2 on a planar ZnO/Si substrate, approaching the physical thickness limit of the material, enables a ? phase jump. Moreover, highly dispersive extinctions of MoS2 further empowers broadband phase regulation and enables binary phase-modulated supercritical lenses manifesting constant sub-diffraction-limited focal spots of 0.7 Airy units (AU) from the blue to yellow wavelength range. Our demonstrations downscaling optical elements to atomic thicknesses open new routes for ultra-compact opto-electronic systems harnessing two-dimensional semiconductor platforms with integrated functionalities. © 2021, The Author(s).
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Source Title
Nature Communications
Publisher
Nature Research
Series/Report No.
Collections
Rights
Attribution 4.0 International
Date
2021-01-04
DOI
10.1038/s41467-020-20278-x
Type
Article