A thickness of the same substrate may determine {HEAD ~ a numerical aperture} of {TAIL ~ the optical element} 
of
A thickness of the same substrate may determine { HEAD ~ a numerical aperture } of { TAIL ~ the optical element }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL