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Progress In Electromagnetics Research
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OPTIMAL DESIGN OF GRADED REFRACTIVE INDEX PROFILE FOR BROADBAND OMNIDIRECTIONAL ANTIREFLECTION COATINGS USING GENETIC PROGRAMMING

By Y. Zhao, F. Chen, Q. Shen, and L. Zhang

Full Article PDF (678 KB)

Abstract:
To eliminate the average reflectance of antireflection coatings to the greatest extent, a Genetic Programming (GP) algorithm is proposed to design and optimize the graded refractive index distribution profile for broadband omnidirectional antireflection coatings. The proposed GP-index profile in this paper can obtain an extremely low average reflectance of 4.61×10-7% over a wide range of incident angles and wavelengths which is obviously superior to the average reflectance of 8.09×10-3%, 3.29×10-4% and 4.35×10-5% for linear profile, cubic profile and quintic profile. That means, Fresnel reflection almost can be eliminated by the optimal GP-index profile for omnidirectional incidence over a broad wavelength range. Moreover, it is demonstrated the proposed GP-index profile has better robustness, and it still has the best broadband and omnidirectional antireflection characteristics for the TiO2/SiO2 graded-index AR coating. Therefore, the proposed GP-index profile is obviously superior to the conventional linear profile, cubic profile and quintic profile, and the design methodology presented in this paper that uses a genetic programming technique is a quite convenient means to pursue an optimal nonlinear refractive index profile with broadband and omnidirectional antireflection characteristics.

Citation:
Y. Zhao, F. Chen, Q. Shen, and L. Zhang, "Optimal Design of Graded Refractive Index Profile for Broadband Omnidirectional Antireflection Coatings Using Genetic Programming," Progress In Electromagnetics Research, Vol. 145, 39-48, 2014.
doi:10.2528/PIER14010809
http://www.jpier.org/PIER/pier.php?paper=14010809

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