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|Title:||Creation of a needle of longitudinally polarized light in vacuum using binary optics|
|Source:||Wang, H., Shi, L., Luk̀yanchuk, B., Sheppard, C., Chong, C.T. (2008-08). Creation of a needle of longitudinally polarized light in vacuum using binary optics. Nature Photonics 2 (8) : 501-505. ScholarBank@NUS Repository. https://doi.org/10.1038/nphoton.2008.127|
|Abstract:||Recently many ideas have been proposed for the use of a longitudinal field for particle acceleration, fluorescent imaging, second-harmonic generation and Raman spectroscopy. A few methods to enhance the longitudinal field component have been suggested, but all have insufficient optical efficiency and non-uniform axial field strength. Here we report a new method that permits the combination of very unusual properties of light in the focal region, permitting the creation of a 'pure' longitudinal light beam with subdiffraction beam size (0.43λ). This beam is non-diffracting; that is, it propagates without divergence over a long distance (of about 4λ) in free space. This is achieved by focusing a radially polarized Bessel-Gaussian beam with a combination of a binary-phase optical element and a high-numerical-aperture lens. This binary optics works as a special polarization filter enhancing the longitudinal component. © 2008 Macmillan Publishers Limited. All rights reserved.|
|Source Title:||Nature Photonics|
|Appears in Collections:||Staff Publications|
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