Journal
NANOPHOTONICS
Volume 9, Issue 15, Pages 4609-4618Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0420
Keywords
all-optical tunability; broadband dispersion free nonlinear materials; epsilon-near-zero photonics; nonlinear metasurfaces; ultrafast photonics
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Funding
- National Key Research and Development Program of China [2018YFB2200403, 2018YFA0704404]
- National Natural Science Foundation of China [61775003, 11734001, 91950204, 11527901, 91850117, 11604378, 11654003, 91850111]
- Beijing Municipal Science & Technology Commission [Z191100007219001]
- Beijing Institute of Technology Research Fund Program for Young Scholars
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Broadband dispersion free, large and ultrafast nonlinear material platforms comprise the essential foundation for the study of nonlinear optics, integrated optics, intense field optical physics, and quantum optics. Despite substantial research efforts, such material platforms have not been established up to now because of intrinsic contradictions between large nonlinear optical coefficient, broad operating bandwidth, and ultrafast response time. In this work, a broadband dispersion free, large and ultrafast nonlinear material platform based on broadband epsilonnear-zero (ENZ) material is experimentally demonstrated, which is designed through a novel physical mechanism of combining structural dispersion and material dispersion. The broadband ENZ material is constructed of periodically nanostructured indium tin oxide (ITO) films, and the structure is designed with the help of theoretical predictions combined with algorithm optimization. Within the whole broad ENZ wavelength range (from 1300 to 1500 nm), a wavelength-independent and large average nonlinear refractive index of -4.85 x 10(-1)1 cm(2)/W, which is enlarged by around 20 times than that of an unstructured ITO film at its single ENZ wavelength, and an ultrafast response speed at the scale of Tbit/s are experimentally reached simultaneously. This work not only provides a new approach for constructing nonlinear optical materials but also lays the material foundation for the application of nanophotonics.
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