1.Advanced Optics and Photonics Laboratory, Department of Engineering, School of Science & Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
2.ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
3.School of Science & Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
4.School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
5.School of Physics, Nankai University, Tianjin 300071, China
6.Department of Physics, Imperial College London, London SW7 2BW, UK
7.School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
Mohsen Rahmani (mohsen.rahmani@ntu.ac.uk)
Lei Xu (lei.xu@ntu.ac.uk)
Published:30 November 2024,
Published Online:10 September 2024,
Received:29 February 2024,
Revised:15 July 2024,
Accepted:15 July 2024
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Zheng, Z. et al. Broadband infrared imaging governed by guided-mode resonance in dielectric metasurfaces. Light: Science & Applications, 13, 2599-2610 (2024).
Zheng, Z. et al. Broadband infrared imaging governed by guided-mode resonance in dielectric metasurfaces. Light: Science & Applications, 13, 2599-2610 (2024). DOI: 10.1038/s41377-024-01535-w.
Nonlinear metasurfaces have experienced rapid growth recently due to their potential in various applications
including infrared imaging and spectroscopy. However
due to the low conversion efficiencies of metasurfaces
several strategies have been adopted to enhance their performances
including employing resonances at signal or nonlinear emission wavelengths. This strategy results in a narrow operational band of the nonlinear metasurfaces
which has bottlenecked many applications
including nonlinear holography
image encoding
and nonlinear metalenses. Here
we overcome this issue by introducing a new nonlinear imaging platform utilizing a pump beam to enhance signal conversion through four-wave mixing (FWM)
whereby the metasurface is resonant at the pump wavelength rather than the signal or nonlinear emissions. As a result
we demonstrate broadband nonlinear imaging for arbitrary objects using metasurfaces. A silicon disk-on-slab metasurface is introduced with an excitable guided-mode resonance at the pump wavelength. This enabled direct conversion of a broad IR image ranging from > 1000 to 4000 nm into visible. Importantly
adopting FWM substantially reduces the dependence on high-power signal inputs or resonant features at the signal beam of nonlinear imaging by utilizing the quadratic relationship between the pump beam intensity and the signal conversion efficiency. Our results
therefore
unlock the potential for broadband infrared imaging capabilities with metasurfaces
making a promising advancement for next-generation all-optical infrared imaging techniques with chip-scale photonic devices.
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