| CPC G02B 6/42 (2013.01) [G02B 6/12002 (2013.01); G02B 6/12004 (2013.01); G02B 2006/12142 (2013.01); G02B 6/13 (2013.01); H01L 25/167 (2013.01)] | 21 Claims |

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1. A microelectronic assembly, comprising:
a first integrated circuit (IC) structure, comprising first electrically conductive interconnects and a first optical waveguide;
a second IC structure, comprising second electrically conductive interconnects and a second optical waveguide, the second IC structure attached to the first IC structure; and
a bonding material in at least portions of a bonding interface where the second IC structure is attached to the first IC structure, the bonding material including silicon, nitrogen, and carbon,
wherein at least a portion of the first optical waveguide overlaps, and is in contact with, at least a portion of the second optical waveguide.
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