Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Nanodiamonds in levitated optomechanics

Tools
- Tools
+ Tools

Frangeskou, Angelo (2017) Nanodiamonds in levitated optomechanics. PhD thesis, University of Warwick.

[img]
Preview
PDF
WRAP_Theses_Frangeskou_2017.pdf - Submitted Version - Requires a PDF viewer.

Download (9Mb) | Preview
Official URL: http://webcat.warwick.ac.uk/record=b3174387~S15

Request Changes to record.

Abstract

This thesis reports on research undertaken to explore the viability of using nanodiamonds containing nitrogen vacancy (NV) centres in optical dipole traps.

The impact of illuminating single NV centres with 1550 nm, a common dipole trap wavelength, is investigated. A reduction of 7% in the fluorescence intensity is observed using 20-30 mW of illumination, whilst the NV centre’s optically detected magnetic resonance (ODMR) signal contrast and electron spin T2 time remain unaffected. These results are better than those of similar experiments with 1064 nm.

A method for creating and characterising pure type IIa nanodiamonds containing NV centres is presented. Bulk chemical vapour deposition (CVD) diamonds are electron irradiated and annealed, before being ball milled into nanodiamonds. The bulk purity is determined by quantitative electron paramagnetic resonance. The nanodiamonds are characterised by Raman spectroscopy, electron microscopy and energy dispersive X-ray spectroscopy (EDX). Small quantities of contamination by the silicon nitride milling material could be found using EDX. A confocal microscope was constructed and single NV centres inside the nanodiamonds were found to be photostable and ODMR shows an average ODMR contrast of 9%.

An optical dipole trap was constructed and CVD derived nanodiamonds were levitated. Measurements of the centre-of-mass motion show that unlike commercial type 1b nanodiamonds, they mostly remain at or close to thermal equilibrium in moderate vacuum where commercial material was previously reported to burn and/or graphitise, even when the optical intensity is raised above 700 GW/m². Nanodiamonds are observed to be suddenly ejected from the trap at ~1 mbar.

Item Type: Thesis or Dissertation (PhD)
Subjects: Q Science > QC Physics
Library of Congress Subject Headings (LCSH): Nanodiamonds, Optomechanics
Official Date: September 2017
Dates:
DateEvent
September 2017Submitted
Institution: University of Warwick
Theses Department: Department of Physics
Thesis Type: PhD
Publication Status: Unpublished
Supervisor(s)/Advisor: Morley, Gavin ; Barker, P. F.
Format of File: pdf
Extent: xii, 118 leaves : illustrations, charts
Language: eng

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us