how to increase magnification of images 2,3,4?

clear all;

clc;

close all;

dim=32;

[kx,ky]=meshgrid(-1:2/(dim-1):1);

circ=sqrt(kx.^2+ky.^2)<1;

alp=asin(0.95);

k0=1/sin(alp);

k=256;

kz=sqrt(k0^2-(kx.^2+ky.^2));

Gx=-1i*sqrt(k0./kz).*((k0*ky.^2+kz.*kx.^2)./(k0*(kx.^2+ky.^2)));

Gy=1i*sqrt(k0./kz).*((kz-k0).*kx.*ky)./(k0*(kx.^2+ky.^2));

Gz=1i*sqrt(k0./kz).*(kx./k0);

Fx=1i*sqrt(k0./kz).*((kz-k0).*kx.*ky)./(k0*(kx.^2+ky.^2));

Fy=-1i*sqrt(k0./kz).*((k0*kx.^2+kz.*ky.^2)./(k0*(kx.^2+ky.^2)));

Fz=1i*sqrt(k0./kz).*(ky./k0);

ph=(atan2(kx,ky)+pi);

ph=rot90(ph,3);

l0=exp(1i*ph);

la=l0*1i;

lb=rot90(l0,3);

z=-128:1:127;

c = numel(z);

mz=(pi/(8*2*tan(alp/2)));

n = size(kx);

Ex = zeros([k k c]);

Ey = zeros([k k c]);

Ez = zeros([k k c]);

for jj=1:c

 Ex(:,:,jj)=fftshift(fft2(exp(1i*kz*mz*z(jj)).*

(Gx.*la.*circ)-rot90(exp(1i*kz*mz*z(jj)).*Gy.*lb.*circ,3),k,k));

Ey(:,:,jj)=fftshift(fft2(exp(1i*kz*mz*z(jj)).*

(Gy.*la.*circ)+rot90(exp(1i*kz*mz*z(jj)).*Gx.*lb.*circ,3),k,k));

Ez(:,:,jj)=fftshift(fft2(exp(1i*kz*mz*z(jj)).*

(Gz.*la.*circ)+rot90(exp(1i*kz*mz*z(jj)).*Gz.*lb.*circ,3),k,k));

end

Ex=Ex(k/2,:,:);

Ey=Ey(k/2,:,:);

Ez=Ez(k/2,:,:);

Ex=squeeze(Ex);

Ey=squeeze(Ey);

Ez=squeeze(Ez);

Ix=Ex.*conj(Ex);

Iy=Ey.*conj(Ey);

Iz=Ez.*conj(Ez);

I3=Ix+Iy;

figure(2)

imagesc(I3),colormap gray;%axis image

figure(3)

imagesc(Iz),colormap gray;%axis image

I=Ix+Iy+Iz;

figure(4)

imagesc(I),colormap gray;%axis image

can any one help in this regard,

thank you in advance

Answer 1

[Image Analyst]

There is a zoom() function. In addition, in the imshow() function, there is an 'InitialMagnification' option.