AI Article Synopsis

  • The study investigates how arrays of square coaxial apertures in a gold layer behave in terms of diffraction, highlighting their resonant transmission enhancement.
  • This enhancement is leveraged to create tunable bandpass filters suitable for multispectral imaging in the 7-13 μm wavelength range.
  • A modal analysis reveals that the resonance peaks result from leaky modes in the structure, and experimental measurements confirm the filter's performance, showing angular tolerance of up to 30 degrees.

Article Abstract

The diffractive behavior of arrays of square coaxial apertures in a gold layer is studied. These structures exhibit a resonant transmission enhancement that is used to design tunable bandpass filters for multispectral imaging in the 7-13 μm wavelength range. A modal analysis is used for this design and the study of their spectral features. Thus we show that the resonance peak is due to the excitation of leaky modes of the open photonic structure. Fourier transform infrared (FTIR) spectrophotometry transmission measurements of samples deposited on Si substrate show good agreement with numerical results and demonstrate angular tolerance of up to 30 degrees of the fabricated filters.

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http://dx.doi.org/10.1364/OL.39.004723DOI Listing

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