Manipulation and Verification of Longitudinal Electric Fields for Nonlinear Optical Microscopy
Research output: Book/Report › Doctoral thesis › Collection of Articles
|Publisher||Tampere University of Technology|
|Number of pages||82|
|Publication status||Published - 16 Nov 2018|
|Publication type||G5 Doctoral dissertation (article)|
|Name||Tampere University of Technology. Publication|
This Thesis aims to meet this challenge and to provide new ways to control and probe longitudinal electric ﬁelds at the focus of a high numerical aperture objective. Relying on state-of-the-art spatial phase-shaping techniques of an incident optical ﬁeld, we manage to control various parameters of the longitudinal electric ﬁeld within the focal volume, including its transverse spatial distribution and depth of ﬁeld, demonstrated by collection of second-harmonic generation from vertically aligned GaAs nanowires. The results presented in this Thesis suggest that the strength and spatial distribution of longitudinal ﬁelds can be generally controlled but also probed using our techniques. This work also opens up new opportunities for better understanding optical responses at the nanoscale and is expected to provide alternative imaging techniques for diﬀerent types of nanostructures and possibly later for biological samples. Finally, our phase-shaping techniques provide alternative tools towards more advanced control of polarization in three-dimensions at focus.