Light of free-space wavelength 20 = 0.75 um is guided by a thin planar film of thickness d=2.5 μm and refractive index ni = 1.65, surrounded by a medium of refractive index n2 =1.45. (a) Determine (i) the critical angle Oc; (ii) the numerical aperture NA; and (iii) the maximum acceptance angle ao for light originating in air (no = 1.00).
Light of free-space wavelength 20 = 0.75 um is guided by a thin planar film of thickness d=2.5 μm and refractive index ni = 1.65, surrounded by a medium of refractive index n2 =1.45. (a) Determine (i) the critical angle Oc; (ii) the numerical aperture NA; and (iii) the maximum acceptance angle ao for light originating in air (no = 1.00).
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Light of free-space wavelength 20 = 0.75 um is guided by a thin planar film of thickness d=2.5 μm and refractive index ni = 1.65, surrounded by a medium of refractive index n2 =1.45.
(a) Determine
(i) the critical angle Oc;
(ii) the numerical aperture NA; and
(iii) the maximum acceptance angle ao for light originating in air (no = 1.00).
(b) Determine the number of TE modes possible at this wavelength. Determine
(i) the propagation angle a and
(ii) the propagation constant ß of the m= 0 TE mode (you will need to find a graphical or numerical approximate solution here). (iii) What is the wavelength of this mode inside the medium, measured along the z axis?
(d)
(i) Determine the extinction coefficient y for the same m= O mode.
(ii) At what distance into the outer medium does the field drop to 1% of its magnitude at the boundary?
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