Visual observation of photonic Floquet–Bloch oscillations

Credit: Light: Science & Applications

a, Schematic of a one-dimensional lattice composed of evanescently coupled waveguides with a combined bending trajectory, i.e., a superposition of circular bending trajectory and periodic bending trajectory. b, Cross-sectional optical microscope image of the fabricated sample. Scale bar, 30 μm. c, Top-view optical microscope image of the fabricated sample with a harmonic modulation. Scale bar, 30 μm.

« Visual observation of photonic Floquet–Bloch oscillations

$a–d, Fluorescence microscopy images of the breathing modes under single-site excitation. e–h, Fluorescence microscopy images of the oscillating modes under broad-beam excitation. A coordinate transformation that maps circular arcs into straight lines was digitally applied to the fluorescence images. i, Fractal spectrum of FBOs. The inset is a close-up spectrum at a finer scale, which shows the property of self-similarity of this spectrum. j, Fractional Floquet tunneling of FBOs. The Floquet-induced rescaling of the FBO amplitude follow a linear combination of fractional-order Anger and Weber functions.$

Credit: Light: Science & Applications

a–d, Fluorescence microscopy images of the breathing modes under single-site excitation. e–h, Fluorescence microscopy images of the oscillating modes under broad-beam excitation. A coordinate transformation that maps circular arcs into straight lines was digitally applied to the fluorescence images. i, Fractal spectrum of FBOs. The inset is a close-up spectrum at a finer scale, which shows the property of self-similarity of this spectrum. j, Fractional Floquet tunneling of FBOs. The Floquet-induced rescaling of the FBO amplitude follow a linear combination of fractional-order Anger and Weber functions.

« Visual observation of photonic Floquet–Bloch oscillations

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