Nonlinear geometric phase coded ferroelectric nematic fluids for nonlinear soft-matter photonics

Jin-Tao Pan, Bo-Han Zhu, Ling-Ling Ma (), Wei Chen (), Guang-Yang Zhang, Jie Tang, Yuan Liu, Yang Wei, Chao Zhang, Zhi-Han Zhu, Wen-Guo Zhu, Guixin Li (), Yan-Qing Lu () and Noel A. Clark
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Jin-Tao Pan: Nanjing University
Bo-Han Zhu: Nanjing University
Ling-Ling Ma: Nanjing University
Wei Chen: Nanjing University
Guang-Yang Zhang: Nanjing University
Jie Tang: Nantong University
Yuan Liu: Nanjing University
Yang Wei: Nanjing University
Chao Zhang: Nanjing University
Zhi-Han Zhu: Harbin University of Science and Technology
Wen-Guo Zhu: Department of Optoelectronic Engineering
Guixin Li: Southern University of Science and Technology
Yan-Qing Lu: Nanjing University
Noel A. Clark: Boulder

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Simultaneous manipulation of multiple degrees of freedom of light lies at the heart of photonics. Nonlinear wavefront shaping offers an exceptional way to achieve this goal by converting incident light into beams of new frequencies with spatially varied phase, amplitude, and angular momenta. Nevertheless, the reconfigurable control over structured light fields for advanced multimode nonlinear photonics remains a grand challenge. Here, we propose the concept of nonlinear geometric phase in an emerging ferroelectric nematic fluid, of which the second-order nonlinear susceptibility carries spin-dependent nonlinearity phase. A case study with photopatterned q-plates demonstrates the generation of second-harmonic optical vortices with spin-locked topological charges by using cascaded linear and nonlinear optical spin-orbit interactions. Furthermore, we present the dynamic tunability of second-harmonic structured light through temperature, electric field, and twisted elastic force. The proposed strategy opens new avenues for reconfigurable nonlinear photonics, with potential applications in optical communications, quantum computing, high-resolution imaging, etc.

Date: 2024
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DOI: 10.1038/s41467-024-53040-8

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