Please use this identifier to cite or link to this item:
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
Molecular physics
Confined spot
Experimental demonstrations
Incident wavelength
Intensity profiles
Logarithmic spiral
Micrometer scale
Strong dependences
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.
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
ISSN: 1863-8880
DOI: 10.1002/lpor.201500116
Appears in Collections:Elements
Staff Publications

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
10_1002_lpor_201500116.pdf758.71 kBAdobe PDF



Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.