期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 36, 期 24, 页码 5857-5862出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2018.2878861
关键词
Active plasmonics; optical filters; perfect absorber; surface plasmon polaritons (SPPs)
资金
- National Research Foundation of Korea - Ministry of Science and ICT, Korea government [2017R1C1B2003585, 2017R1A4A1015565]
A wavelength-selective tunable plasmonic absorber is required for various applications, such as thermal imaging sensors, active biosensors, and switching devices in integrated optics. Using Ge2Sb2Te5(GST), which is a representative phase change material showing a large change in optical characteristics, we propose a tunable plasmonic absorber that consists of a metal nanoslit array patterned on a GST-inserted dielectric layer. Based on systematic optimization, the proposed structure achieved a nearly zero reflectance for both states of the inserted GST film with a very large resonance shift after the phase transition. Moreover, the resonance wavelength of the proposed absorber could be flexibly tuned within a broad near-infrared range by tuning the geometric conditions of the nanoslit array and the thicknesses of the dielectric-GST-dielectric multilayer.
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