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A combinatorial etching technique is introduced to prepare integrated narrow bandpass filters in the mid-infrared (MIR) region. In this region, a 16×1 filter array has been fabricated successfully with two deposition processes combined with the combinatorial etching technique. The pass bands of the 16 filter elements range from 2.534 to 2.859 μm with bandwidth (BW3 dB) less than 0.013 μm (BW3 dB/λ≤0...
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