期刊
LASER & PHOTONICS REVIEWS
卷 9, 期 6, 页码 674-681出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201500116
关键词
logarithmic-spiral nanoslit; confined spot; diffraction; broadband spin-controlled focusing
资金
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP Award) [NRF-CRP10-2012-04]
- Agency for Science, Technology and Research (AstarSTAR) under BEP grant [1521480031 (R-263-000-B88-305)]
- National Research Foundation [R-263-000-789-144]
- EPSRC [EP/L024926/1, EP/J018473/1]
- Leverhulme Trust
- Royal Society
- EPSRC [EP/L024926/1, EP/J018473/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J018473/1, EP/L024926/1] Funding Source: researchfish
This work presents analytical, numerical and experimental demonstrations of light diffracted through a logarithmic spiral (LS) nanoslit, which forms a type of switchable and focustunable structure. Owing to a strong dependence on the incident photon spin, the proposed LS-nanoslit converges incoming light of opposite handedness (to that of the LS-nanoslit) into a confined subwavelength spot, while it shapes light with similar chirality into a donut-like intensity profile. Benefitting from the varying width of the LS-nanoslit, different incident wavelengths interfere constructively at different positions, i.e., the focal length shifts from 7.5 mu m (at lambda = 632.8 nm) to 10 mu m (at lambda = 488 nm), which opens up new opportunities for tuning and spatially separating broadband light at the micrometer scale.
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