Nonlinear metasurface engineering with disordered gold nanorods on ITO: a cost-effective approach to broadband response, polarization-independence, and weak nonlinear index dispersion.
Opt Lett
; 49(12): 3400-3403, 2024 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-38875631
ABSTRACT
The strong coupling of epsilon-near-zero materials with nanoantennas has demonstrated enhanced nonlinear optical responses, yet practical challenges persist. Here, we propose an alternative an ultrathin metasurface featuring broadband response with a weakly dispersive nonlinear index, achieved through a simple implementation. Our metasurface, comprising a disordered gold nanorod array on indium tin oxide, exhibits polarization-independent behavior and a large average nonlinear refractive index of 5â
cm2/GW across a broad wavelength range (1000-1300â
nm). Enhanced performance is attributed to the weak coupling between gold nanorods and indium tin oxide, offering a cost-effective method for nonlinear optical metasurfaces and a flexible design in nanophotonic applications.
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MEDLINE
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Opt Lett
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Opt. lett. (Online)
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Optics letters (Online)
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2024
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Article