Design and Preparation of Antireflection and Reflection Optical Coatings

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Design and Preparation of Antireflection and Reflection Optical Coatings
+ y+ ~7 u: S, Y; t3 {$ B7 B9 M: a# W¨Ozlem DUYAR, H¨useyin Zafer DURUSOY
Department of Physics Engineering, Hacettepe University,
Beytepe, 06532 Ankara-TURKEY
0 C3 q2 C4 A- T5 L: W+ we-mail: hzd@hacettepe.edu.tr
8 c  g- K% ^9 @. E: E2 K: PReceived 11.02.2003
" q; N% t. z$ I8 y& a2 q2 M5 HAbstract
- y$ o# k% o+ G* C* p% _9 i5 _In this study, reflective and antireflective coatings were designed and simulated. Optical transmission
and reflection values were deduced with a matrix formulation via a personal computer.
' r; N! d2 ?- \# i$ y& l! N7 jIt was found that the number of layers aects the optical performance. The width of the highreflectance
region in the reflectance curves decreases, while its height increases with the increasing number
of layers for the reflective coating design. The antireflection coatings transmit about 99.89% in a broad
0 \! g1 _" ?. ~8 Jhigh-pass band at the central wavelength of0 = 450 nm. In addition, simulated Fabry-Perot lters
result in a single sharp transmittance peak at the desired central wavelength. The half-width of the
transmission band at central wavelength decreases and its peak height increases with the increasing
number of the coated layers.
To compare with theory, both sides of a glass substrate were deposited a two-layer coating of
8 h  [. _/ Q' L, ?6 Z, dMgO/MgF2 via electron beam evaporation, to produce an antireflective coatings in the visible and
near infrared regions. The optical properties of prepared lms were studied through optical transmission
measurements. The peak transmittance was 98.2% at the central wavelength  = 450 nm.
Key Words: Optical coating, Antireflective coating, Reflective coating, Optical properties.