Design of optical path for wide-angle gradient-index antireflection coatings.
What we believe to be a new principle is introduced for the design and selection of gradient-index antireflection profiles that are effective over a wide range of incident angles as well as wavelengths at a given physical film thickness. It is shown that at oblique incidence the smoothness of the optical path of incident light inside a gradient-index film has a crucial effect on the overall reflection. Thus the smoothness of variations in refractive angle (rather than that of the index profile itself) needs to be maximized for wide-angle operation. As an example, the performance of Gaussian and Quintic profiles at large incident angles are considered in light of this point of view.
Chen
Minfeng
M
Graduate Institute of Electro-Optical Engineering, Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan.
Chang
Hung-chun
HC
Chang
Allan S P
AS
Lin
Shawn-Yu
SY
Xi
J-Q
JQ
Schubert
E F
EF