The optical properties of semiconductors are typically considered intrinsic and fixed. I will discuss how the rapid developments in the understanding of high-index semiconductor nano-antennas can be leveraged to create ultrathin semiconductor metafilms with designer absorption spectra. Such metafilms are constructed by placing one or more types of semiconductor antennas into a dense array with subwavelength spacings. As semiconductor antennas are only weakly-interacting and feature absorption cross sections that can exceed their geometrical cross section, very strongly absorbing metafilms can be created whose spectral absorption properties can directly be linked to the resonant properties of the constituent building blocks. The ability to create semiconductor metafilms with custom absorption spectra opens up new design strategies for planar optoelectronic devices and solar cells.
Mark L. Brongersma, "Engineering light absorption in semiconductor metafilms (Presentation Recording)," Proc. SPIE 9546, Active Photonic Materials VII, 95461L (Presented at SPIE Nanoscience + Engineering: August 13, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2189962.4519370278001.
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