Depth-Dependent Defect Studies Using Coherent Acoustic Phonons
Abstract
Presented is our scientific progress in two areas of research. The first is coherent acoustic phonon (CAP) spectroscopy of diamond crystals. We showed an ion implantation process significantly modifies the acousto-optical structure of diamond, resulting in a variety of features in the observed CAP spectra. These features were examined as a function of implantation dose and an empirical model was applied to the data, yielding good agreement. We continue this work by exploring the effects of single layer graphene on diamond with the goal of understanding how the relaxation dynamics of graphene is altered by coupling to different diamond interfaces and the effect of diamond on the scattering mechanisms involved and determining the efficiency of different pathways for energy relaxation. The second area of focus is a project assessing the transient strain produced by CAP waves. We have compared the measured CAP spectra to ab initio calculations of the opto-electronic properties of materials. We are also using CAP waves as an active moving interface to induce local changes in electric, acoustic, and optical properties. This is able to generate ultrafast, homogenous, transient localized strains of similar magnitude of other methods, thereby enhancing electronic and optical response of any target material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 29, 2014
- Accession Number
- ADA623355
Entities
People
- Norman Tolk
- Stephanie G. Corder
Organizations
- Vanderbilt University