Semiconductor Physics, Quantum Electronics & Optoelectronics. 2008. V. 11, N 1. P. 023-025.

Selective unequal-thickness thin-film filters for IR spectral region
I.Ya. Yaremchuk1, V.M. Fitio1, Ya.V. Bobitski1,2

1Institute of Telecommunications and Radio, Engineering Department of Photonics Lviv Polytechnic National University, 12, Bandera str., 79013 Lviv, Ukraine Phone: 8-032-2582581, e-mail:
2Institute of Technology, Rzeszow University 16b, T. Rejtana str., Rzeszow 35959, Poland

Abstract. A new five-layer structure of the dielectric interference filter for the infra-red region of spectrum is investigated. The main spectral parameters of such a narrow-band filter are determined. The dependence of the transmission band half-width on the thickness of a dividing layer in this system is investigated. It is shown that, in the case of the application of PbTe, GeTe, and SnTe layers with a given thickness; their number can be limited to five at providing the necessary selectivity of the filter: practically the 100-% transmission at the resonance frequency and 0.005 % outside the transmission band.

Keywords: interference filter, narrow-band filter.

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