Generation of Hofstadter's butterfly spectrum using circular arrays of microring resonators.
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DOI: 10.1364/ol.384552
Abstract: Hofstadter's butterfly spectrum, which characterizes the energy bands of electrons in a 2D lattice under a perpendicular magnetic field, has been emulated and experimentally characterized in periodic bandgap structures at microwave and acoustic frequencies. However,… read more here.
Keywords: optics; hofstadter butterfly; butterfly spectrum;