期刊
NANO LETTERS
卷 20, 期 11, 页码 7964-7972出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02712
关键词
exciton; transition-metal dichalcogenides; meta-optics; hologram; subdiffraction limit imaging; photonsieve
类别
资金
- Agency for Science, Technology and Research (A*STAR) Singapore [SERC A1685b0005, 152700014, 152700012]
- CAS Pioneer Hundred Talents Program, the Fundamental Research Funds for the Central Universities in China
- USTC Research Funds of the Double First-Class Initiative [YD2030002003]
- National Natural Science Foundation of China [61875181, 61705085]
- University of Science and Technology of China's Centre for Micro and Nanoscale Research and Fabrication
- Singapore Ministry of Education Academic Research Fund Tier 3 [MOE2016-T31-006 (S)]
- Singapore Ministry of Education through the Academic Research Fund [RG189/17(S)]
Optical wavefront engineering has been rapidly developing in fundamentals from phase accumulation in the optical path to the electromagnetic resonances of confined nanomodes in optical metasurfaces. However, the amplitude modulation of light has limited approaches that usually originate from the ohmic loss and absorptive dissipation of materials. Here, an atomically thin photon-sieve platform made of MoS2 multilayers is demonstrated for high-quality optical nanodevices, assisted fundamentally by strong excitonic resonances at the band-nesting region of MoS2. The atomic thin MoS2 significantly facilitates high transmission of the sieved photons and high-fidelity nanofabrication. A proof-of-concept two-dimensional (2D) nanosieve hologram exhibits 10-fold enhanced efficiency compared with its non-2D counterparts. Furthermore, a supercritical 2D lens with its focal spot breaking diffraction limit is developed to exhibit experimentally far-field label-free aberrationless imaging with a resolution of similar to 0.44 lambda at lambda=450 nm in air. This transition-metal-dichalcogenide (TMDC) photonic platform opens new opportunities toward future 2D meta-optics and nanophotonics.
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