In this instance, a buffer layer for preventing {HEAD ~ propagation loss} of {TAIL ~ the optical waves} in the excitation electrode may be formed between the substrate and the excitation electrode 
In this instance , a buffer layer for preventing { HEAD ~ propagation loss } of { TAIL ~ the optical waves } in the excitation electrode may be formed between the substrate and the excitation electrode
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH