{HEAD ~ Method} for producing an optical semiconductor device having a carrier injection path or {TAIL ~ an electric field applying path} 
{ HEAD ~ Method } for producing an optical semiconductor device having a carrier injection path or { TAIL ~ an electric field applying path }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL