Abstract

Pb1-xGexTe is a pseudobinary alloy of IV–VI narrow-gap semiconductor, of which maximum refractive index corresponds to the ferroelectric phase transition. Since the temperature coefficient of refractive index can be tunable from negative to positive by changing the Ge composition, it is possible to utilize the intrinsic property in the fabrication of infrared thin-film interference filters. In this letter, we report a narrow-bandpass filter, in which Pb0.94Ge0.06Te was substituted for PbTe. It found that the low-temperature stability of the filter is obviously improved: in the temperature range of 80-300K, the shift of center wavelength with temperature is reduced from 0.48nm. K-1 to 0.23nm K-1; furthermore, the peak transmittance of filter fabricated with Pb0.94Ge0.06Te is ~3% over that fabricated with PbTe.

© 2004 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef]
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Appl. Opt. (2)

J. Appl. Phys. (1)

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

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 (4)

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).

W. E. Johnson, B. P. Edmonds and M. J. Wolf, �??Environmental stability of rugate filters: in-situ measurements of their spectral properties,�?? in Optical diagnostic methods for inorganic transmissive materials, R.V. Datla and L. M. Hanssen, eds., Proc. SPIE 3425, 85-92 (1998).

Zoller, R. Gotzelmann, H. Hagedorn, W. Klug and K. Matl, �??Plasma ion assisted deposition: a powerful technology for the production of optical coatings,�?? in Optical thin films V: new developments, R. L. Hall, eds., Proc. SPIE 3133, 196-204 (1997).

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

Waves (1)

S. Y. Zhang, �??Optical properties of Pb1-xGexTe films,�?? Chinese J. Infrared Millim. Waves, 20, 69-72 (2001).

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Figures (2)

Fig. 1.
Fig. 1.

(a) Low-temperature spectral characteristics of the filter fabricated with Pb0.94Ge0.06Te; (b) Low-temperature spectral characteristics of the filter fabricated with PbTe.

Fig. 2.
Fig. 2.

Comparison of center wavelength and peak transmittance versus temperature for two filters (square and up-triangle are for the filter fabricated with Pb0.94Ge0.06Te; circle and down-triangle are for that fabricated with PbTe)

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