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 π 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Qin F,Liu B,Zhu L,Lei J,Fang W,Hu D,Zhu Y,Ma W,Wang B,Shi T,Cao Y,Guan BO,Qiu CW,Lu Y,Li Xdoi
10.1038/s41467-020-20278-xsubject
Has Abstractpub_date
2021-01-04 00:00:00pages
32issue
1issn
2041-1723pii
10.1038/s41467-020-20278-xjournal_volume
12pub_type
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