A transparent chip substrate or appropriate holes within the substrate would allow {HEAD ~ the external optical devices} to be positioned within {TAIL ~ the semispherical volume} beneath the chip 
to be positioned within
A transparent chip substrate or appropriate holes within the substrate would allow { HEAD ~ the external optical devices } to be positioned within { TAIL ~ the semispherical volume } beneath the chip
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH