Abstract
Aluminum is an alternative plasmonic material in the visible regions of the spectrum due to its attractive properties such as low cost, high natural abundance, ease of processing, and complementary metal-oxide-semiconductor (CMOS) and liquid crystal display (LCD) compatibility. Here, we present plasmonic colour filters based on coaxial holes in aluminium that operate in the visible range. Using both computational and experimental methods, fine-tuning of resonance peaks through precise geometric control of the coaxial holes is demonstrated. These results will lay the basis for the development of filters in high-resolution liquid crystal displays, RGB-spatial light modulators, liquid crystal over silicon devices and novel displays.
Highlights
Ebbesen et al [1] reported for the first-time extraordinary optical transmission through sub-wavelength holes in metal films
We have presented plasmonic colour filters based on coaxial aperture array using a hexagonal arrangement in aluminium
The light was focused onto the samples using a Eclipse inverted colours is achieved by geometric control of the coaxial hole arrays (CHs) array
Summary
Ebbesen et al [1] reported for the first-time extraordinary optical transmission through sub-wavelength holes in metal films. For practical applications such as in plasmonic colour filters, plasmonic band pass filters, solar cells, and chemical sensors, a hexagonal arrangement is preferable to a square arrangement This is because the hexagonal arrangement has a higher fill factor compared to the square array for the same period, and increased transmission efficiency. This fill factor is very important for the development of colour filters where vacant spaces will cause performance degradation and reduced transmission efficiency. We have presented plasmonic colour filters based on coaxial aperture array using a hexagonal arrangement in aluminium. Two coaxial hole-based plasmonic filters were subsequently fabricated using focused ion beam (FIB), and their experimental performance is demonstrated
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