Spatial resolution effect of light coupling structures

Juntao Li*, Kezheng Li, Christian Schuster, Rongbin Su, Xuehua Wang, Ben-Hur V. Borges, Thomas F. Krauss, Emiliano R. Martins

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The coupling of light between free space and thin film semiconductors is an essential requirement of modern optoelectronic technology. For monochromatic and single mode devices, high performance grating couplers have been developed that are well understood. For broadband and multimode devices, however, more complex structures, here referred to as "coupling surfaces", are required, which are often difficult to realise technologically. We identify general design rules based on the Fourier properties of the coupling surface and show how they can be used to determine the spatial resolution required for the coupler's fabrication. To our knowledge, this question has not been previously addressed, but it is important for the understanding of diffractive nanostructures and their technological realisation. We exemplify our insights with solar cells and UV photodetectors, where high-performance nanostructures that can be realised cost-effectively are essential.

Original languageEnglish
Article number18500
Number of pages7
JournalScientific Reports
Publication statusPublished - 18 Dec 2015


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