Full Length Research Paper

Optimum designing of thin film filter layers of SiO₂ and SnTe based on optical particle swarm opimizer

H. Arabshahi¹* and M. Asmari²

¹Physics Department, Ferdowsi University of Mashhad, Mashhad, Iran.

²Climatology of Atmospheric Disasters Group, Climatological Research Institute, P. O. Box 91735–676, Mashhad, Iran.

*Corresponding author. E-mail: Arabshahi@um.ac.ir.

Accepted 19 November, 2009

   Abstract

Optical design of multilayer filter has been carried out using a particle swarm optimizer algorithm. The filters are designed to work for wavelength in the range of 1550 - 1600 nm. Our calculation results show good convergence rate and higher performance in comparison with results based on genetic algorithm. The calculated result for band pass filter layers of Sio₂ and SnTe have also shown that the transmittance parameter is about 0.994. The results for narrow filters show that the values of S and P reflectance parameter are in fair agreement with other methods and average transmittance parameter is about 0.985 which is 25% better than flip-flop results.

Key words: Optical design, genetic algorithm, narrow filters, transmittance.