π-phase modulated monolayer supercritical lens

Fei Qin, Boqing Liu, Linwei Zhu, Jian Lei, Wei Fang, Dejiao Hu, Yi Zhu, Wendi Ma, Bowen Wang, Tan Shi, Yaoyu Cao, Bai-ou Guan, Cheng-wei Qiu, Yuerui Lu () and Xiangping Li ()
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Fei Qin: Institute of Photonics Technology, Jinan University
Boqing Liu: the Australian National University
Linwei Zhu: Ludong University
Jian Lei: Institute of Photonics Technology, Jinan University
Wei Fang: Institute of Photonics Technology, Jinan University
Dejiao Hu: Institute of Photonics Technology, Jinan University
Yi Zhu: the Australian National University
Wendi Ma: the Australian National University
Bowen Wang: the Australian National University
Tan Shi: Institute of Photonics Technology, Jinan University
Yaoyu Cao: Institute of Photonics Technology, Jinan University
Bai-ou Guan: Institute of Photonics Technology, Jinan University
Cheng-wei Qiu: National University of Singapore
Yuerui Lu: the Australian National University
Xiangping Li: Institute of Photonics Technology, Jinan University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-020-20278-x

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