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Abstract
This work presents analytical, numerical and experimental demonstrations of light diffracted through a logarithmic spiral (LS) nanoslit, which forms a type of switchable and focus-tunable 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 μm (at λ = 632.8 nm) to 10 μm (at λ = 488 nm), which opens up new opportunities for tuning and spatially separating broadband light at the micrometer scale.
Original language | English |
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Pages (from-to) | 674–681 |
Journal | Laser and Photonics Reviews |
Volume | 9 |
Issue number | 6 |
Early online date | 19 Sept 2015 |
DOIs | |
Publication status | Published - 24 Nov 2015 |
Keywords
- logarithmic-spiral nanoslit
- confined spot
- diffraction
- broadband spin-controlled focusing
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Dive into the research topics of 'Broadband spin-controlled focusing via logarithmic-spiral nanoslits of varying width'. Together they form a unique fingerprint.Projects
- 1 Finished
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NSF Materials World Network: Classical and Quantum Optical Metamaterials by Combining Top-down and Bottom-Up Fabrication Techniques
Zhang, S. (Principal Investigator)
Engineering & Physical Science Research Council
1/02/13 → 31/01/16
Project: Research Councils