30 August 2006 Enhanced THz transmission apertures through sub-wavelength annular apertures
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We report on the development of a surface micromachined process for the fabrication of coaxial apertures surrounded by periodic grooves. The process uses a combination of copper electroforming and the negative epoxy based resist, SU8, as a thin flexible substrate. The device dimensions are suitable for the implementation of filters at THz frequencies, and measurements show a pass band centred around 1.5 THz. These devices could form the basis of the next generation of THz biosensors.
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A. J. Gallant, J. A. Levitt, M. Kaliteevski, D. Wood, M. C. Petty, R. A. Abram, S. Brand, and J. M. Chamberlain "Enhanced THz transmission apertures through sub-wavelength annular apertures", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 632316 (30 August 2006); doi: 10.1117/12.680552; https://doi.org/10.1117/12.680552

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