Fig. 1. Flowchart of the inversion phases of the contour intersection method

Fig. 2. Complex refractive index of Au nanoparticles with a diameter of 50 nm at a wavelength of 632.8 nm. (a) Scattering efficiency; (b) absorption efficiency; (c) scattering efficiency and absorption efficiency isometric projection on the n-k plane are inverted by the contour intersection method

Fig. 3. Complex refractive index of Au nanoparticles with a diameter of 50 nm at a wavelength of 632.8 nm. (a) Scattering efficiency; (b) absorption efficiency; (c) scattering efficiency and absorption efficiency isometric projection on the n-k plane are inverted by the contour intersection method

Fig. 4. Complex refractive index of Au nanoparticles with a diameter of 50 nm at 632.8 nm. (a) Backscattering efficiency; (b) projection of contour lines in the n-k plane

Fig. 5. Effect of the step length on the real (n) and imaginary (k) of the refractive index of inversion. (a) Inversion result of the real part of the refractive index; (b) relative error of the real part of the refractive index inversion result; (c) inversion result of the imaginary part of the refractive index; (d) relative error of the inversion result of the imaginary part of the refractive index

Fig. 6. Average relative error of the results of the contour intersection method and the iterative method changes with the refractive index range value step. (a) Average relative error of the real inversion result of the refractive index; (b) average relative error of the imaginary inversion result of the refractive index

Fig. 7. Effect of size on the real (n) and imaginary (k) of the refractive index when inverted by the contour intersection method. (a) Inversion result of the real part of the refractive index; (b) the relative error of the real part of the refractive index inversion result; (c) inversion result of the imaginary part of the refractive index; (d) relative error of the inversion result of the imaginary part of the refractive index

Fig. 8. Average relative error of the results of the contour intersection method and the iterative method as a function of particle size. (a) Average relative error of the real inversion result of the refractive index; (b) average relative error of the imaginary inversion result of the refractive index

Fig. 9. Effect of measurement error on the refractive index of inversion during conformal intersection method inversion. (a) Inversion result of the real part of the refractive index; (b) relative error of the inversion result of the real part of the refractive index; (c) inversion result of the imaginary part of the refractive index; (d) relative error of the inversion result of the imaginary part of the refractive index

Fig. 10. Average relative error of the results of the contour intersection method and the iterative method as a result of the measurement error. (a) Average relative error of real inversion result of the refractive index; (b) average relative error of the imaginary inversion result of the refractive index

Table 1. Inversion of the contour intersection method and the iterative method

Table 2. Contour intersection method the time taken, memory occupation and CPU ratio