Abstract

The degeneration of performance of an optical thin-film interference filter associated with the change of temperature is not acceptable. In this letter, we report a new progress in improving low-temperature performance of infrared narrow-band filters by using Pb1-xGexTe initial bulk alloy with appropriate Ge concentration x. It can be found that there exists a critical temperature for the investigated narrowband filter, at which the temperature coefficient of filter is exactly zero. Therefore, by means of controlling the composition in (Pb1-xGex)1-yTey layers, the temperature coefficient of filter can be tunable at the designated low-temperature. In our present investigation, when temperature varies from 300 to 85 K, a shift of peak wavelength of 0.05935 nm.K-1 has been achieved.

© 2005 Optical Society of America

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References

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    [CrossRef] [PubMed]
  7. B. Li, J. C. Jiang, S. Y. Zhang, and F. S. Zhang, �??Low-temperature dependence of mid-infrared optical constants of lead germanium telluride thin film,�?? J. Appl. Phys. 91, 3556-3561 (2002).
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    [CrossRef] [PubMed]

Appl. Opt. (2)

J. Appl. Phys. (1)

B. Li, J. C. Jiang, S. Y. Zhang, and F. S. Zhang, �??Low-temperature dependence of mid-infrared optical constants of lead germanium telluride thin film,�?? J. Appl. Phys. 91, 3556-3561 (2002).
[CrossRef]

J. Phys. Chem. Solid (1)

D. K. Hohnke, H. Holloway, and S. Kaiser, �??Phase relations and transformations in the system PbTe-GeTe,�?? J. Phys. Chem. Solid 33, 2053-2062 (1972).
[CrossRef]

Opt. Express (1)

Phys. Rev. Lett. (1)

Q. T. Islam, �??Ferroelectric transition in Pb1-xGexTe: extended X-ray-absorption fine-structure investigation of the Ge and Pb sites,�?? Phys. Rev. Lett. 59, 2701-2704 (1987).
[CrossRef] [PubMed]

Proc. SPIE (2)

J. S. Seeley, R. Hunneman, and A. Whatley, �??Temperature-invariant and other narrow-band IR filters containing PbTe, 4-20 µm,�?? in Contemporary infrared sensors and instruments, H. Kaplan and F. M. Zweibaum, eds., Proc. SPIE 246, 83-94 (1980).

D. F. Heath, E. Hilsenrath, and S. Janz, �??Characterization of a �??hardened�?? ultrastable UV linear variable filter and recent results on the radiometric stability of narrow band interference filters subjected to temperature/humidity, thermal/vacuum and ionizing radiation environments,�?? in Optical remote sensing of the atmosphere and clouds, J. Wang, B. Wu, T. Ogawa and Z. Guan, eds., Proc. SPIE 3501, 401-411 (1998).
[CrossRef]

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Figures (2)

Fig. 1.
Fig. 1.

(a) Low-temperature spectral characteristics of the filter with (Pb0.8584Ge0.1416)0.4575Te0.5425 layers; (b) Enlargement of low-temperature spectral characteristics of pass-band with peak wavelength of 11.30 μm

Fig. 2.
Fig. 2.

Comparison of peak wavelength and peak transmittance versus temperature

Equations (1)

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substrate|LHLH LL ¯ HLH|air

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