Nanotransfer Printed Dual-Layer Metasurfaces for Infrared Cut-off Applications

This study presents the design and fabrication of a vertically stacked aluminum (Al) nanosquare metasurface for infrared cutoff (IR-cut) applications, utilizing advanced nanomaterials to enhance device performance by blocking infrared light while maintaining transparency in the visible spectrum. Rigorous coupled wave analysis simulations were employed to evaluate and optimize the optical performance of the metasurface, focusing on key parameters such as nanosquare size, period, thickness, and the gap between stacked layers. The optimized metasurface design, based on simulation results, exhibited a balanced performance, achieving an average visible light transmittance of 59.9% across the 400-700 nm wavelength range, while providing effective extended-range IR suppression with an average transmittance of only 6.5% in the 720-1200 nm range. To fabricate these metasurfaces, a nanotransfer printing (nTP) technique was employed, offering a simplified and efficient alternative to traditional lithography and lift-off processes. This design not only reduces the overall thickness of the optical devices but also facilitates easy integration into integrated optical components. This study highlights the potential of nTP-fabricated metasurfaces as effective and scalable solutions for IR-cut filters, advancing the field of applied nanomaterials while contributing to the development of more compact and efficient optical systems.