Abstract
The improvement of solar energy conversion has been largely investigated in recent years. Studies show that the incorporation of rough surface for increased light scattering efficiency in combination with surface plasmon resonance (SPR) offers significant absorption enhancement. In this paper we present the design, simulation and fabrication of multiple periodic plasmonic arrays with different nanoaperture diameters for broadband enhancement of optical absorption. Structure of periodic nanoapertures consisting of nickel (Ni), titanium dioxide (TiO2) and gold (Au) was first designed, simulated and fabricated using nanoimprint lithography and deposition techniques. Optical measurements were carried using Cary 6000i internal diffuse reflectance accessory. Structures of different aperture diameters were prepared and characterized. The best results show an absorption over 92% through predominant part of visible spectrum for 250 nm aperture.
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