Design and optimization of low-loss wideband antireflection coatings for the visible and infrared regions: a new method

C. L. Nagendra; M. Viswanathan; G. K. M. Thutupalli

doi:10.1364/AO.24.001156

Applied Optics
Vol. 24,
Issue 8,
pp. 1156-1163
(1985)
•https://doi.org/10.1364/AO.24.001156

Design and optimization of low-loss wideband antireflection coatings for the visible and infrared regions: a new method

C. L. Nagendra, M. Viswanathan, and G. K. M. Thutupalli

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C. L. Nagendra, M. Viswanathan, and G. K. M. Thutupalli, "Design and optimization of low-loss wideband antireflection coatings for the visible and infrared regions: a new method," Appl. Opt. 24, 1156-1163 (1985)

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Abstract

A new method for design of multilayer antireflection coatings (ARCs) which makes use of a specified reflectance value R₀, either zero or nonzero at a particular wavelength λ₀, is developed. It offers an explicit scheme for evaluation of the optical/geometrical thickness of each layer, and the design variables are optimized with respect to integrated reflection loss R* over a specified bandwidth. It has been found that the method can be applied for design of wideband ARCs useful in the visible and IR regions, and the resulting bandwidth and residual reflection losses can be controlled as a function of R₀. The method is found to be comprehensive so that more useful designs can be worked out, and it can be directly adopted to the design of single- and double-layer ARCs.

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Sl. no.	ARC configuration	Central Wavelength λ₀	Initial set value R₀		Optimized thickness (μm)		Integrated reflectance R*	Spectral bandwidth	Maximum^a reflectance dispersion [ΔR(%)/Δλ]
(1)	1.7/2.56/3.45/4.4	15.0	0.000	2.018	0.0108	0.87	0.156	12.5–17.2(4.7 μm) (for R = 1.0%)	0.5
			0.005	1.801	0.491	0.79	0.111	12.4–18.3(6.0 μm) (for R = 1.0%)	0.24
			0.008	1.777	0.571	0.78	0.114	14.3–18.6(4.3 μm) (for R = 1.0%)	0.33
			0.015	1.752	0.703	0.76	0.134	16.3–19.3(3.0 μm) (for R = 1.0%)	0.50
									(In the central wavelength region)
(2)	1.465/4.021/1.465/4.02	10.0	0	1.645	0.216	0.297	0.012	7.1–11.4(4.3 μm) (for R =0.6%)	0.15
			0.0003	1.569	0.199	0.290	0.013	7.3–11.2(3.9 μm) (for R =0.6%)	0.00
			0.0005	1.603	0.208	0.280	0.015	7.0–11.0(4.0 μm) (for R = 0.6%)	0.10
			0.0045	1.641	0.222	0.23	0.046	7.8–10.2(2.4 μm) (for R =0.6%)	0.30
									(Within the 8–10-μm range)
(3)	1.23/1.38/1.45/1.52	0.7	0	0.137	0.002	0.021	0.0033	0.57–0.90(0.33 μm) (for R = 0.5%)	7.4
			0.002	0.117	0.041	0.064	0.0017	0.54–0.96(0.42 μm) (for R = 0.5%)	3.1
			0.005	0.114	0.076	0.055	0.0020	0.68–1.00(0.32 μm) (for R = 0.5%)	2.5
(4)	1.38/1.45/1.63/1.52	0.6	0			No viable solutions
			0.001			No viable solutions
			0.002	0.103	0.002	0.103	0.0049	0.52–0.72(0.20 μm) (for R = 1.0%)	8.2
			0.005	0.094	0.0003	0.138	00041	0.53–0.73(0.20 μm) (for R = 1.0%)	8.0
			0.010	0.091	0.005	0.162	0.0038	0.60–0.76(0.16 μm) (for R = 1.0%)	5.0
			0.015	0.072	0.040	0.168	0.0047	0.68–0.78(0.10 μm) (for R = 1.0%)	6.25
(5)	1.38/2.1/1.88/1.52	0.6	0.000	0.099	0.030	0.096	0.0038	0.42–0.70(0.28 μm) (for R = 1.0%)	5.0
			0.002	0.100	0.033	0.084	0.0054	0.40–0.66(0.26 μm) (for R = 1.0%)	3.60
			0.005	0.101	0.035	0.076	0.0072	0.40–0.61(0.21 μm) (for R = 1.0%)	5.00

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Applied Optics