What is it about?
The function of optical fiber is more than light transmission. Growing a metal-free perovskite semiconductor inside a capillary with a diameter of 5 micron, we have demonstrated second-harmonic generation in a semiconductor-core optical fiber for the first time.
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Why is it important?
The current semiconductor core optical fibers, such silicon and germanium optical fibers, have a relatively narrow bandgap and a centrosymmetric crystal structure, thus limits their transmission of visible light and no second-order nonlinearity. The metal-free perovskite semiconductor has the advantages of wide bandgap and non-centrosymmetric structure, which can transmit light in the UV range and demonstrate second-harmonic generation, and therefore can enable a wider range of applications, such as all-optical signal processing and quantum optics. Moreover, the small core diameter allows tight confinement of light and the possibility of isolating the fundamental mode for nonlinear optical applications.
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This page is a summary of: Few-mode metal-free perovskite optical fiber with second-order optical nonlinearity, APL Photonics, March 2024, American Institute of Physics,
DOI: 10.1063/5.0186789.
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