Abstract

Very sharp 90° micro-bends for adiabatic optical wave propagation in multimode waveguides are demonstrated by an inverse design method, and the devices are fabricated on a silicon-on-insulator platform. The compact bending structures are based on digital waveguide metastructures with footprints as small as 2.6  μm×2.6  μm. For waveguides with widths of 2 μm and bending radii of only 1 μm, the TE00 mode is able to turn around the sharp corner with 1 dB loss and >20  dB suppression ratio to higher-order modes. The transmission spectra of the devices are measured with 1  dB loss over a 40 nm bandwidth which are consistent with the numerical simulations.

© 2018 Optical Society of America

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Supplementary Material (8)

NameDescription
» Visualization 1       Normal Bend: Radius=1  um, Waveguide width=1.2um
» Visualization 2       Normal Bend: Radius=1  um, Waveguide width=2um
» Visualization 3       Normal Bend: Radius=1.2  um, Waveguide width=2.4um
» Visualization 4       Normal Bend: Radius=2  um, Waveguide width=2.4um
» Visualization 5       Designed DMMB: Radius=1  um, Waveguide width=1.2um
» Visualization 6       Designed DMMB: Radius=2  um, Waveguide width=1.2um
» Visualization 7       Designed DMMB: Radius=1.2  um, Waveguide width=2.4um
» Visualization 8       Designed DMMB: Radius=2  um, Waveguide width=2.4um

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