06 November 2014 Fractal future

Peano fractal electrode

Transparent fractal electrodes for photodetection highlighted in Nature Photonics Fractals are beautiful patterns based on the principle of self-similarity. Well-known examples include the branching arrangements of trees, river networks or blood vessels. In a recent collaboration between Stanford and ICFO, Farzaneh Afshinmanesh in the Brongersma group and Alberto Curto of the Molecular NanoPhotonics group led by ICREA Professor at ICFO Niek van Hulst, have discovered that fractals can be put to good use in photonics by creating transparent ultrathin metallic electrodes. They have fabricated Si-photo-detectors with fractal electrodes, resulting in superior performance both in broad-band and flat polarization response. The work, published in NanoLetters 14, 5068-5074 (2014), is highlighted in the November issue of Nature Photonics.