Absorbing multilayer coatings producing a 90° phase shift

E. Cojocaru; T. Julea; F. Nichitiu

doi:10.1364/AO.29.3984_1

Applied Optics
Vol. 29,
Issue 28,
pp. 3984_1-3985
(1990)
•https://doi.org/10.1364/AO.29.3984_1

Absorbing multilayer coatings producing a 90° phase shift

E. Cojocaru, T. Julea, and F. Nichitiu

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E. Cojocaru, T. Julea, and F. Nichitiu, "Absorbing multilayer coatings producing a 90° phase shift," Appl. Opt. 29, 3984_1-3985 (1990)

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Abstract

As an example of the great influence the parameters of a multilayer coating have in the absorption, this Technical Note considers five pairs of ThF₄/ZnS or ThF₄/CdTe layers on silver at 10.6-μm wavelength at a 45° angle of incidence.

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	(ThF₄/ZnS)⁶		(ThF₄/CdTe)⁵
	Nonabsorbing layers	Absorbing layers	Nonabsorbing layers	Absorbing layers
	(k = 0)	(k = 0.01)	(k = 0)	(k = 0.01)
x₁	0.20317	0.05561	0.29972	0.10378
x₂	0.30402	0.10465	0.22000	0.28261
x₃	0.15355	0.07850	0.29964	0.26264
x₄	0.30000	0.25535	0.24720	0.28105
x₅	0.17375	0.08430	0.26977	0.21005
x₆	0.30231	0.36191	0.21172	0.21361
x₇	0.05883	0.09840	0.29678	0.31806
x₈	0.40122	0.38780	0.21272	0.22642
x₉	0.08998	0.11782	0.33200	0.26403
x₁₀	0.30000	0.30000	0.22000	0.22000
R_s (%)	99.100	55.630	99.940	67.048
R_p (%)	98.533	47.384	99.590	43.887
Δϕ	−90.000°	90.000°	90.002°	90.001°
β/β₀	0.996–1.008	0.986–1.006	0.998–1.002	1.000–1.002

	(ThF₄/ZnS)⁵	(ThF₄/CdTe)⁵
R_s (%)	37.50	62.22
R_p (%)	37.54	36.89
Δϕ	−93.947°	90.654°
β/β₀	0.994–1.006	0.998–1.002

	(ThF₄/ZnS)⁶		(ThF₄/CdTe)⁵
	Nonabsorbing layers	Absorbing layers	Nonabsorbing layers	Absorbing layers
	(k = 0)	(k = 0.01)	(k = 0)	(k = 0.01)
x₁	0.20317	0.05561	0.29972	0.10378
x₂	0.30402	0.10465	0.22000	0.28261
x₃	0.15355	0.07850	0.29964	0.26264
x₄	0.30000	0.25535	0.24720	0.28105
x₅	0.17375	0.08430	0.26977	0.21005
x₆	0.30231	0.36191	0.21172	0.21361
x₇	0.05883	0.09840	0.29678	0.31806
x₈	0.40122	0.38780	0.21272	0.22642
x₉	0.08998	0.11782	0.33200	0.26403
x₁₀	0.30000	0.30000	0.22000	0.22000
R_s (%)	99.100	55.630	99.940	67.048
R_p (%)	98.533	47.384	99.590	43.887
Δϕ	−90.000°	90.000°	90.002°	90.001°
β/β₀	0.996–1.008	0.986–1.006	0.998–1.002	1.000–1.002

	(ThF₄/ZnS)⁵	(ThF₄/CdTe)⁵
R_s (%)	37.50	62.22
R_p (%)	37.54	36.89
Δϕ	−93.947°	90.654°
β/β₀	0.994–1.006	0.998–1.002

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Applied Optics