Local phase measurements of light in a one-dimensional photonic crystal |
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Authors: | E Flück A M Otter J P Korterik M L M Balistreri L Kuipers & N F Van Hulst |
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Affiliation: | Applied Optics Group, Department of Applied Physics and MESA;+ Research Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands |
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Abstract: | For the first time the local optical phase evolution in and around a small, one-dimensional photonic crystal has been visualized with a heterodyne interferometric photon scanning tunnelling microscope. The measurements show an exponential decay of the optical intensity inside the crystal, which consists of a periodic array of subwavelength air rods fabricated in a conventional ridge waveguide. In addition it is found that the introduction of the air rods has a counterintuitive effect on the phase development inside the structure. The heterodyne detection scheme allows the detection of low-intensity scattered waves. In the vicinity of the scattering air rods phase singularities are found with a topological charge of plus or minus one. |
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Keywords: | Coherent light scattering near‐field optics photonic crystals scanning probe microscopy |
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