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Table 1 Comparison of refractive index (n), nonlinear refractive index (n2) and extinction coefficient (k) at two different wavelengths for optical nonlinear materials (a) and OPCM (b)

From: Perspective on photonic memristive neuromorphic computing

Materialn
λ = 600 nm
n
λ = 1500 nm
n2
(m2/W)
k
λ = 600 nm
k
λ = 1550 nm
a Nonlinear optical materials
 graphene2.7 [115]3.1 [115]−1∙10− 13 at λ = 1600 nm [84]1.3 [115]2.2 [115]
 GO1.9 [116]2.1 [117]8∙10−13 at λ = 800 nm [118]0.1 [116]0.3 [117]
 reduced GO1.8 [116]−4.9∙10−13 at λ = 800 nm [119]0.2 [116]
 Silicon4 [115]3.5 [120]4.3∙10−18 at λ = 1600 nm [121]0.03 [115]0.01 [120]
b Phase change materials
 GST (amorphous)3.2 [122]3.1 [122]1 [122]0.1 [122]
 GST (crystalline)3.3 [122]4.2 [122]1.8 [122]0.8 [122]
 VO2 (amorphous)3.0 [123]3.3 [123]0.5 [123]0.4 [123]
 VO2 (crystalline)2.2 [123]2.8 [123]7.5∙10−8 at λ = 800 nm [101]03.9 [123]0.6 [123]
 As2S32.7 [124]2.4 [124]3.8∙10−10 at λ = 1550 nm [124]
 Sb2Te31.8 [110]6.0 [110]2.6∙10−9 at λ = 632.8 nm [125]2.9 [110]0.8 [110]