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ÎÒ°´ÕÕ Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings ÕâÆªÎÄÏ×°´ÕÕ·Ö²ãµÄ·½·¨±àдµÄmatlab³ÌÐò£¬µ±¹âÕ¤²ÄÁÏÕÛÉäÂÊΪʵÊýʱ£¬½á¹ûÓëÆäËûÈí¼þ½øÐжԱȶ¼ÊǶԵġ£µ«Êǵ±¹âÕ¤²ãÕÛÉäÂÊΪ¸´Êýʱ£¬¼ÆËãµÄÑÜÉäЧÂÊ»á´óÓÚ1£¬²»ÖªµÀÊDz»ÊDz»ÄÜÊÕÁ²µÄÎÊÌâ¡£
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for i=1:num*2-1;
              if i~=num;
                    epsil1(i)=(1/n2^2-1/n1^2)*(sin(pi*(i-num)*ff)/(pi*(i-num)));
                else
                    epsil1(i)=1/n2^2*ff+1/n1^2*(1-ff);
                end
            end
for p=1:num;
                for q=1:num;
                    E1(p,q)=epsil1(p-q+num);
                end
          end
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