AI Article Synopsis
- A metasurface made of an indium-tin-oxide nano-step array shows weak dispersion and high optical nonlinearity, which is important for various applications like spectroscopy and quantum computing.
- The enhanced nonlinearity is due to a balance between structural and material dispersion in a specific spectral region where the effective permittivity is near zero.
- The metasurface maintains a nonlinear refractive index of approximately 1.5 × 10 cm GW across a wide range of wavelengths (1300 to 1510 nm), making it a promising candidate for advanced nonlinear photonic devices.
Article Abstract
Optical media with dispersion-free large nonlinearity are highly desired for a broad range of applications, such as spectroscopy, all-optical data processing, and quantum information. Here, we report that a metasurface composed of an indium-tin-oxide nano-step array can exhibit weak-dispersion and enhanced optical nonlinearity theoretically in the region of the spectrum where the real part of its effective permittivity is close to zero. Such nonlinear features are attributed to the offset of the structural dispersion and material dispersion of the metasurface in its epsilon-near-zero region. The nonlinear refractive index of our metasurface remains at around = 1.5 × 10 cm GW in a wide wavelength range from 1300 to 1510 nm, and the nonlinear absorption coefficient is greater than 1 × 10 cm GW in the range from 1280 to 1780 nm in simulation. Our results open a novel approach to applications of nonlinear photonic devices requiring high integration density and stable performance.
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| http://dx.doi.org/10.1039/d4cp02439g | DOI Listing |
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