Controlling Active Clusters Using Wave-Shaped Light Patterns
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Colloidal systems appear in various contexts. In some of these systems, ther mophoretic forces can arise around otherwise passive particles when they are il luminated, leading to the emergence of complex behaviours. These types of systems
has been extensively studied under constant, uniform light where the emergent be haviours are simply activated and deactivated. The aim of this project is to show
that the emergent behaviour can not only be activated and deactivated, but also
controlled by employing more complex light patterns.
The model used in this project includes Brownian motion and thermophoretic forces,
with collisions between particles being resolved by a volume exclusion method. The
thermophoretic forces are activated by employing travelling wave light patterns to
affect the behaviours of different clusters formed as a result of these forces. Two
different patterns are then superimposed to show that more complex light patterns
can induce more complex behaviours.
This study is mostly qualitative in nature and only conducted in simulations. While
the parameter space has only been roughly explored and the study needs to be val idated through physical experiments, the results of the project indicate that a more
comprehensive exploration of the parameter space for a broader range of clusters
can be of interest.
Beskrivning
Ämne/nyckelord
simulation, active matter, Brownian motion, thermophoresis, self-organisation, colloidal system.