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. 1996 Nov 1;35(31):6210-5.
doi: 10.1364/AO.35.006210.

Cross-shaped bandpass filters for the near- and mid-infrared wavelength regions

K D Möller, J B Warren, J B Heaney, C Kotecki

Cross-shaped bandpass filters for the near- and mid-infrared wavelength regions

K D Möller et al. Appl Opt. .

Abstract

A photolithographic process has been used to form cross-shaped patterns in 3-μm-thick nickel foils. Patterns with cross arm dimensions in the 10-20-μm range, and with periodicities in the 16-26-μm range, yield self-resonant bandpass filters for wavelengths in the 20-25-μm region. Transmittances as high as 80% were achieved with center wavelength-to-bandwidth ratios (λ(R)/Δλ) of ~5. We present a simple empirical formula that relates the wavelength of peak transmittance, or resonant frequency, with cross dimensions and periodicity.

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