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Title: Photons : tools at the nanoscale
Author: Smith , David
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2015
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This thesis will consider how photons are actually 'tools' for studying and manipulating the nanoscale regime. A tool is considered to be any man-made entity that helps in performing a function, of which all tools could fall into one of two categories; tools either help to record parameters that characterise phenomena, or help to utilise or manipulate phenomena for our advantage. It is argued that many modern scientific instruments (i.e. microscopes) use photons as tools for measuring or influencing the nanoscale regime. This thesis is divided along similar lines. The first body of work looks at using the deflection of photons as a tool to measure the nanoscale regime (i.e a microscope) whilst the second body of work considers using photons as tools for processing in the nanoscale regime. The investigations into the deflection of photons were conducted by studying light scattered forward onto a quadrant photodiode (QPD). This entailed studying fixed 100mm nanoparticles in a modified photonic force microscope (PFM) for calibration purposes. Subsequent studies measured the letters 'NSQI', fixed mammalian cells (RPE-1) and single walled-carbon nanotubes (SWCNTs). Computational procedures were developed to reconstruct the 3D distribution of scatterers for the 'NSQI' and cellular samples. The second body of work focusses on using photons as tools for processing in the nanoscale regime. Namely, on using the resonant transfer of photonic momentum as a method of selectively sorting SWCNTs by chirality. To this end, simulations were conducted into the use of a resonance based optical sorting technique to separate SWCNTs dispersed in solution. It was found that the separation time could be reduced to less than 10 minutes when processed with an intensity of 104 Wem-2 at elevated solution temperatures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available