How planar optical waves can be made to climb dielectric steps

M. Hammer, A. Hildebrandt, J. Förstner, Optics Letters 40 (2015).

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Journal Article | Published | English
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Abstract
We show how to optically connect guiding layers at different elevations in a 3-D integrated photonic circuit. Transfer of optical power carried by planar, semi-guided waves is possible without reflections or radiation losses, and over large vertical distances. This functionality is realized through simple step-like folds of high-contrast dielectric slab waveguides, in combination with oblique wave incidence, and fulfilling a resonance condition. Radiation losses vanish, and polarization conversion is suppressed for TE wave incidence beyond certain critical angles. This can be understood by fundamental arguments resting on a version of Snell’s law. The two 90° corners of a step act as identical partial reflectors in a Fabry–Perot-like resonator setup. By selecting the step height, i.e., the distance between the reflectors, one realizes resonant states with full transmission. Rigorous quasi-analytical simulations for typical silicon/silica parameters demonstrate the functioning. Combinations of several step junctions can lead to other types of optical on-chip connects, e.g., U-turn- or bridge-like configurations.
Publishing Year
Journal Title
Optics Letters
Volume
40
Issue
16
Article Number
3711-3714
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Hammer M, Hildebrandt A, Förstner J. How planar optical waves can be made to climb dielectric steps. Optics Letters. 2015;40(16). doi:10.1364/ol.40.003711
Hammer, M., Hildebrandt, A., & Förstner, J. (2015). How planar optical waves can be made to climb dielectric steps. Optics Letters, 40(16). https://doi.org/10.1364/ol.40.003711
@article{Hammer_Hildebrandt_Förstner_2015, title={How planar optical waves can be made to climb dielectric steps}, volume={40}, DOI={10.1364/ol.40.003711}, number={163711–3714}, journal={Optics Letters}, publisher={The Optical Society}, author={Hammer, Manfred and Hildebrandt, Andre and Förstner, Jens}, year={2015} }
Hammer, Manfred, Andre Hildebrandt, and Jens Förstner. “How Planar Optical Waves Can Be Made to Climb Dielectric Steps.” Optics Letters 40, no. 16 (2015). https://doi.org/10.1364/ol.40.003711.
M. Hammer, A. Hildebrandt, and J. Förstner, “How planar optical waves can be made to climb dielectric steps,” Optics Letters, vol. 40, no. 16, 2015.
Hammer, Manfred, et al. “How Planar Optical Waves Can Be Made to Climb Dielectric Steps.” Optics Letters, vol. 40, no. 16, 3711–3714, The Optical Society, 2015, doi:10.1364/ol.40.003711.
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