Characterizing ultrashort optical pulses using second-order nonlinear nanoprobes

摘要

We report a second-order nonlinear nanoprobe for characterizing ultrafast optical near fields. Thenproposed nanoprobe comprises second harmonic nanocrystals attached to a carbon nanotube, whichnis in turn attached to a silica fiber taper. We demonstrate in situ pulse characterization directly in thenair core of a photonic crystal fiber. Further, it is shown that nanoprobes containing a singlennanocrystal in the tip of the nanotube can be fabricated by auxiliary focused ion beam nanomilling.nThese results indicate that the proposed nanoprobe can open an avenue for probing the evolution ofnultrafast optical fields in complex three-dimensional micro- or nanostructures. © 2010 AmericannInstitute of Physics. u0004doi:10.1063/1.3532112