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