G. Brambilla, M. Ding, J. Ou, N. Sessions, Y. Jung, O. Fenwick, F. di Stasio, F. Cacialli, Junlong Kou, F. Xu
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Sub-wavelength focusing of high intensities in microfibre tips
Sub-wavelength efficient intensity confinement has been demonstrated in nanostructured optical microfibre tips. Focus Ion Beam (FIB) milling was used to nanostructure gold-coated optical microfibre tips and form apertures at the apex. Simulations were carried out to optimize the device design. Enhanced transmission efficiency (higher than 10-2) was achieved in spot sizes of ~λ /10. Nanostructured microfibre tips have the potential for a number of applications including optical recording, photolithography and scanning near-field optical microscopy (SNOM).
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