Lu Yanxin, Zheng Jiahui, Zhang Feilian, Guo Qiqi, Song Yunfei, Dong Jiannan, Chen Yihang
Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, School of Physics, South China Normal University, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China.
Phys Chem Chem Phys. 2024 Sep 18;26(36):23631-23635. doi: 10.1039/d4cp02439g.
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.
具有无色散大非线性的光学介质在光谱学、全光数据处理和量子信息等广泛应用中备受青睐。在此，我们报道一种由铟锡氧化物纳米台阶阵列组成的超表面，理论上在其有效介电常数实部接近零的光谱区域可呈现弱色散和增强的光学非线性。这种非线性特性归因于超表面在其介电常数近零区域的结构色散和材料色散的抵消。在1300至1510纳米的宽波长范围内，我们超表面的非线性折射率在模拟中保持在约 = 1.5 × 10厘米/吉瓦，在1280至1780纳米范围内非线性吸收系数大于1 × 10厘米/吉瓦。我们的结果为需要高集成密度和稳定性能的非线性光子器件应用开辟了一种新方法。
