| CPC H01L 23/5381 (2013.01) [H01L 23/66 (2013.01); H01L 25/0655 (2013.01); H01P 3/12 (2013.01); H01P 3/121 (2013.01); H01P 5/12 (2013.01); H01L 2223/6627 (2013.01)] | 22 Claims |

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1. An integrated circuit (IC) structure, comprising:
a waveguide interconnect bridge, the waveguide interconnect bridge comprising a waveguide material and one or more wall cavities, the waveguide material laterally surrounding the one or more wall cavities, and the waveguide material having an uppermost surface at a same level as an uppermost surface of the one or more wall cavities; and
a package substrate;
wherein the waveguide interconnect bridge is in or on the package substrate.
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