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Demonstration of optical interference filters utilizing tunable refractive index layers

David J. Poxson, Frank W. Mont, Martin F. Schubert, Jong Kyu Kim, Jaehee Cho, and E. Fred Schubert

Open Access Open Access

Abstract

Optical interference filters utilizing tunable refractive index layers are shown to have higher spectral fidelity as compared to conventional filters consisting of non-tunable refractive index layers. To demonstrate this increase in spectral fidelity, we design and compare a variety of optical interference filters employing both tunable and non-tunable refractive index layers. Additionally, a five-layer optical interference filter utilizing tunable refractive index layers is designed and fabricated for use with a Xenon lamp to replicate the Air Mass 0 solar irradiance spectrum and is shown to have excellent spectral fidelity.

©2010 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a), (b) Correlation coefficient as a function of allowed maximum reflectance for 4- and 5-layer optical interference filters utilizing both tunable and non-tunable refractive index layers. (c) Correlation coefficient as a function of the number of layers for both tunable and non-tunable refractive index layers.

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Fig. 3
Fig. 3 Measured and calculated reflectance of the 5-layer optical interference filter plotted as a function of wavelength.

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Fig. 2
Fig. 2 SEM of a 5-layer optical interference structure for use with a Xenon lamp spectrum that utilizes tunable refractive index layers and has an output spectrum with a high correlation to the AM0 solar spectrum.

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Fig. 4
Fig. 4 (a) Measured filtered and un-filtered Xenon-lamp spectra transmitted through the 5-layer optical interference filter utilizing tailored refractive indices is compared to the AM0 solar spectrum. (b) Calculated and measured intensity of Xenon-lamp spectra transmitted through the 5-layer optical interference filter are compared to the AM0 spectrum.

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Equations (3)

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r xy = ∑ i = 1 N ( x i − x ¯ ) ( y i − y ¯ ) S x S y .
S x = 1 N ∑ i = 1 N ( x i − x ¯ ) 2 .
R = [ n h i g h − n l o w n h i g h + n l o w ] 2 .
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