1. Band pass filters in the 1μm spectral region: Thick metal screens
- Author
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K. Abdijalilov, K. D. Möller, Joachim Schulz, A. Lüker, Herbert Hein, M.J. Sweetgall, Haim Grebel, O. Sternberg, and N. Dambrowsky
- Subjects
Waveguide (electromagnetism) ,Materials science ,business.industry ,Infrared ,Condensed Matter Physics ,Aspect ratio (image) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Metal ,Wavelength ,Optics ,Transmission (telecommunications) ,Band-pass filter ,visual_art ,visual_art.visual_art_medium ,business ,Lithography - Abstract
Free standing metal screens have long been used as band pass filters in the infrared (IR) wavelength region. One adjusts the screens’ periodicity constant, its opening-to-periodicity aspect ratio and its thickness to achieve desired infrared transmission properties. Here we concentrate on thick screens in the near IR wavelength region (1–2 μm). In addition to experiments and simulations we have considered the role of screen imperfection on its transmission characteristics. Uneven surfaces, inclined and sometimes rough walls of the screen and waveguide channels may be the result of thick-film lithography which is used in the process for screen manufacturing. Understanding these effects is crucial to applications of these filters in the entire IR region.
- Published
- 2008
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