Printing of 3D photonic crystals in titania with complete bandgap across the visible spectrum.

Autor: Zhang W; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore., Min J; Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore.; United Microelectronics Center (CUMEC), Chongqing, China., Wang H; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore.; College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China.; Greater Bay Area Institute for Innovation, Hunan University, Guangzhou, China., Wang H; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore., Li XL; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore., Ha ST; Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, Republic of Singapore., Zhang B; Frontiers Science Center for Flexible Electronics (FSCFE), Xi'an Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, P. R. China., Pan CF; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore.; Department of Electrical and Computer Engineering, National University of Singapore (NUS), Singapore, Singapore., Li H; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore., Liu H; Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, Republic of Singapore., Yin H; College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China., Yang X; College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China., Liu S; Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore., Xu X; United Microelectronics Center (CUMEC), Chongqing, China., He C; Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore., Yang HY; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore., Yang JKW; Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore. joel_yang@sutd.edu.sg.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2024 Dec; Vol. 19 (12), pp. 1813-1820. Date of Electronic Publication: 2024 Sep 09.
DOI: 10.1038/s41565-024-01780-5
Abstrakt: A photonic bandgap is a range of wavelengths wherein light is forbidden from entering a photonic crystal, similar to the electronic bandgap in semiconductors. Fabricating photonic crystals with a complete photonic bandgap in the visible spectrum presents at least two important challenges: achieving a material refractive index > ~2 and a three-dimensional patterning resolution better than ~280 nm (lattice constant of 400 nm). Here we show an approach to overcome such limitations using additive manufacturing, thus realizing high-quality, high-refractive index photonic crystals with size-tunable bandgaps across the visible spectrum. We develop a titanium ion-doped resin (Ti-Nano) for high-resolution printing by two-photon polymerization lithography. After printing, the structures are heat-treated in air to induce lattice shrinkage and produce titania nanostructures. We attain three-dimensional photonic crystals with patterning resolution as high as 180 nm and refractive index of 2.4-2.6. Optical characterization reveals ~100% reflectance within the photonic crystal bandgap in the visible range. Finally, we show capabilities in defining local defects and demonstrate proof-of-principle applications in spectrally selective perfect reflectors and chiral light discriminators.
Competing Interests: Competing interests: The authors declare no competing interests.
(© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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