Please use this identifier to cite or link to this item:
https://doi.org/10.1002/lpor.201500116
Title: | Broadband spin-controlled focusing via logarithmic-spiral nanoslits of varying width | Authors: | Mehmood, M.Q Liu, H Huang, K Mei, S Danner, A Luk'yanchuk, B Zhang, S Teng, J Maier, S.A Qiu, C.-W |
Keywords: | Condensed matter physics Diffraction Molecular physics Confined spot Experimental demonstrations Incident wavelength Intensity profiles Logarithmic spiral Micrometer scale Nanoslits Strong dependences Nanostructures |
Issue Date: | 2015 | Citation: | Mehmood, M.Q, Liu, H, Huang, K, Mei, S, Danner, A, Luk'yanchuk, B, Zhang, S, Teng, J, Maier, S.A, Qiu, C.-W (2015). Broadband spin-controlled focusing via logarithmic-spiral nanoslits of varying width. Laser and Photonics Reviews 9 (6) : 674-681. ScholarBank@NUS Repository. https://doi.org/10.1002/lpor.201500116 | 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. A logarithmic spiral (LS) nanoslit with switchable focusing functionalities has been experimentally demonstrated as a promising candidate to identify the handedness of incident circular polarization. Strongly depending on spin of incident photons, this LS-nanoslit converges the incoming light with opposite handedness (with respect to the handedness of the LS-slit) into a confined subwavelength spot, while the light with identical chirality is structured into a donut-shape profile at the focal plane. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA. | Source Title: | Laser and Photonics Reviews | URI: | https://scholarbank.nus.edu.sg/handle/10635/174667 | ISSN: | 1863-8880 | DOI: | 10.1002/lpor.201500116 |
Appears in Collections: | Elements Staff Publications |
Show full item record
Files in This Item:
File | Description | Size | Format | Access Settings | Version | |
---|---|---|---|---|---|---|
10_1002_lpor_201500116.pdf | 758.71 kB | Adobe PDF | OPEN | Published | View/Download |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.