4 March 2016 Transmittance of long-wavelength infrared surface plasmon by hexagonal periodic metal hole arrays
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Abstract
For long wave length infrared transmission, a surface plasmonic device, having the periodic subwavelength metal hole array on Si substrate, was fabricated using photo-lithography and electron beam evaporation. The maximum transmitted wavelength was adjustable arbitrarily as a function of the period hole arrays. The maximum transmittance was measured 70.3% at 15.4 μm with a plasmonic device composed of a pitch of 5 μm and hole arrays of 3 μm. When the hole size became larger than a half pitch of the hole array, the transmitted infrared spectrum was split into two peaks. The surface plasmon mode of the six degenerated (1,0) Ag/Si was split from three to five modes depending on the incident beam angle. The blue and red wavelength shifts were measured at the same time.
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Byungwoo Lee, Hoe Min Kwak, Ha Sul Kim, "Transmittance of long-wavelength infrared surface plasmon by hexagonal periodic metal hole arrays", Proc. SPIE 9742, Physics and Simulation of Optoelectronic Devices XXIV, 97421E (4 March 2016); doi: 10.1117/12.2213855; https://doi.org/10.1117/12.2213855
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