Low-pass rugate spatial filters for beam smoothing |
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| Authors: | Zhaoming Luo Shuangchun Wen Zhixiang Tang Yuanjiang Xiang |
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| Affiliation: | a Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Computer and Communication, Hunan University, Changsha 410082, China
b College of Information and Telecommunications Engineering, Hunan Institute of Science and Technology, Yueyang 414004, China |
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| Abstract: | A new application of rugate structures is proposed as low-pass spatial filters for beam smoothing. By using the transfer matrix method to analyze the spatial properties of the bandgap of rugate structures, the low-pass rugate spatial filters with both an almost ideal flat bandpass and a rather steep switching between pass- and stop-bands are designed. The angle-domain bandwidth of the spatial filters can be adjusted by changing the parameters of rugate structures for a given light frequency. The near-field simulations carried out by using the finite-difference time-domain technique confirm the possibility of an efficient light smoothing. |
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| Keywords: | Rugate structure Spatial filter Beam smoothing |
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