Ultrafast response of single ferroelectric nanoparticles
Abstract/Contents
- Abstract
- Ferroelectric nanowires represent fundamental building blocks of complex functional devices due to their large nonlinear optical and piezoelectric responses, related to the large built-in electric polarization of the ferroelectric material. The coupling of light to nanoscale ferroelectrics enables novel means of engineering and manipulating their coupled degrees of freedom and inducing new functionality, including photo-ferroelectric effects and other opto-mechanical responses.Because one dimensional nanowires with subwavelength diameters exhibit modified light-matter interactions, they represent an unexplored means of coupling to these degrees of freedom all-optically. Here we present ultrafast nonlinear-optical measurements of light induced structural and electronic dynamics within single ferroelectric nanowires driven by above band gap femtosecond light pulses. By utilizing second harmonic generation (SHG) processes, which are sensitive to the non-centrosymmetry of the unit cell, we can probe the structural and polarization response in real-time. We can also identify the crystallographic orientation of the nanowire by SHG. In this thesis, the results for single barium titanate nanowires and potassium niobate are discussed. We observe ultrafast modulations in SHG, associated with both photo-refractive effects and polarization rotation under light excitation from single barium titanate nanowires. Then the nonlinear optical measurements probing the dynamics of single potassium niobate nanowires integrated into an optical tweezers setup is discussed. We observe large-amplitude, reversible modulations of the nonlinear optical properties and the associated ferroelectric polarization developing within a few picoseconds, and probe the enhanced coupling of the light into the nanowire. These measurements open up new possibilities for both all-optical manipulation of the nonlinear optical properties of single nanowires and for ultrafast microscopy at sub-wavelength resolution.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2015 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Kuo, Yi-Hong |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Lindenberg, Aaron Michael |
| Thesis advisor | Lindenberg, Aaron Michael |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Miller, D. A. B |
| Advisor | Fan, Shanhui, 1972- |
| Advisor | Miller, D. A. B |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Yi-Hong Kuo. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2015. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2015 by Yi-Hong Kuo
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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