Il-Kwon Moon

Optical performance of bimetallic mirrors under lateral temperature distributions

The optical performance evaluations for various mirror shapes due to lateral temperature distributions were conducted using the finite element analysis program, SDRC-IDEAS. In this study, bimetallic effects with two different plating materials (nickel and aluminum) were considered for aluminum mirrors and beryllium mirror substrates. Lateral temperature distributions used in this thermal analysis, are cases of linear, quadratic and cubic variations. The optical surface deformations were reduced in terms of Zernike coefficients by the program PCFRINGE. Additionally, corrected surface deformations after piston, tilts, and focus removed were calculated. It was found that the optical performances of bimetallic mirrors strongly depend on the plating material, plating thickness, and the mirror substrate shapes. The results indicate that there does not exist a definitive common rule for the optimum. A detailed analysis as presented herein is generally required to adequately predict the bimetallic effects.

From optical MEMS to photonic crystal

This paper presents the emergence of photonic crystals as significant optomechatronics components, following optical MEMS. It is predicted that, in the coming years, optical MEMS and photonic crystals may go through dynamic interactions leading to synergy as well as competition. First, we present the Structured Defect Photonic Crystal (SDPCTM) devised by the authors for providing the freedom of designing photonic bandgap structures, such that the application of photonic crystals be greatly extended. Then, we present the applications of optical MEMS and photonic crystals to displays and telecommunications. It is shown that many of the applications that optical MEMS can contribute to telecommunications and displays may be implemented by photonic crystals.