Needle Beam -- Explanatory Diagrams (IMAGE)

Harvard University

Needle Beam -- Explanatory Diagrams

Caption

Top: This shows a micrograph and diagram of the metallic gratings that produce the needle beam. Bottom: This is an approximation of the experimental setup. A laser is focused from the glass substrate side onto the device. Once the non-diffractive surface wave is created, detailed information on its intensity distribution is gathered using an ultrahigh-spatial-resolution near-field scanning optical microscope.

Credit

Images courtesy of Patrice Genevet.

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