期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep08660
关键词
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资金
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP) [NRF-CRP10-2012-04]
- Leverhulme trust
- EPSRC Active Plasmonics Programme
- 973 Program of China [2013CBA01700]
- Chinese Nature Science Grant [61138002, 61307043]
- Engineering and Physical Sciences Research Council [EP/H000917/2] Funding Source: researchfish
- EPSRC [EP/H000917/2] Funding Source: UKRI
A novel hybrid planar lens is proposed to engineer the far-field focusing patterns. It consists of an array of slits which are filled with phase-change material Ge2Sb2Te5 (GST). By varying the crystallization level of GST from 0% to 90%, the Fabry-Perot resonance supported inside each slit can be spectrally shifted across the working wavelength at 1.55 mu m, which results in a transmitted electromagnetic phase modulation as large as 0.56 pi. Based on this geometrically fixed platform, different phase fronts can be constructed spatially on the lens plane by assigning the designed GST crystallization levels to the corresponding slits, achieving various far-field focusing patterns. The present work offers a promising route to realize tunable nanophotonic components, which can be used in optical circuits and imaging applications.
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