Imaging of the Second-harmonic Response of Spatially-oriented Individual Ion-shaped Nanoparticles
Research output: Other conference contribution › Paper, poster or abstract › Scientific
|Number of pages||1|
|Publication status||Published - 10 Aug 2016|
|Event||2016 Progress in Electromagnetic Research Symposium - Shanghai, Shanghai, China|
Duration: 8 Aug 2016 → 12 Aug 2016
|Conference||2016 Progress in Electromagnetic Research Symposium|
|Period||8/08/16 → 12/08/16|
microscopy based on second-harmonic generation and polarized optical beams.
The arrays of gold nanoparticles were fabricated by first preparing an array of spherical particles in silica matrix. These particles were then illuminated by a beam of xenon ions. Depending on the total ion fluence, the gold particle elongate along the direction of irradiation, while maintaining constant volume, allowing nanorods and even nanowires to be fabricated. The tilt angle of the
particles was adjusted by the direction of ion irradiation.
Second-harmonic microscopy of nanorods was based on using linearly and radially polarized beams focused by a high-numerical-aperture objective. This technique allows the transverse and longitudinal field components in the focus to be controlled. This in turn affects the coupling of the incident light to the nanorods with different orientations.
We report the high sensitivity of the second-harmonic response to the orientation of the nanorods for different states of polarization. The experimental results were obtained to be in very good agreement with simulations based on the boundary-element method. Compared with previous
reports, our results provide a considerable improvement for understanding the interaction of highly focused beams with anisotropic sub-wavelength structures.