Optical trapping and manipulation of a single calix[4] arene microcluster in water
<p>This research aimed to optically trap and manipulate a single calix[4]arene</p><p>microcluster in water. The optically trapped microclusters were evaluated in terms of</p><p>their optical stiffness and rotatability with respect...
Saved in:
| Main Author: | |
|---|---|
| Format: | thesis |
| Language: | eng |
| Published: |
2022
|
| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=9786 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | <p>This research aimed to optically trap and manipulate a single calix[4]arene</p><p>microcluster in water. The optically trapped microclusters were evaluated in terms of</p><p>their optical stiffness and rotatability with respect to the variation of microclusters'</p><p>effective radius and laser power density. The calixarene microclusters contained</p><p>solution was prepared by sonicating a vial containing a mixture of 1.7 mg of</p><p>calix[4]arene powder in 1 ml of deionised water for three minutes. Calix[4]arene</p><p>microclusters in the effective radius range between 0.5 and 3.5 m were optically</p><p>trapped using a 976 nm laser at laser power densities between 0.67 and 2.30 MW/cm2</p><p>with laser sport size 1.1 m. A quadrant photodiode (QPD) collected the scattered</p><p>light from a single trapped microcluster. The QPD signal was analysed using a</p><p>custom-made program named OSCal to determine the corner frequency of the optical</p><p>trap. A quarter waveplate was introduced to the laser path to change the laser</p><p>polarisation state and induce microcluster rotation. The rotatability of the trapped</p><p>microcluster was determined by analysing the QPD signal and particle tracking</p><p>method. Results showed that as the laser power density increases, the corner</p><p>frequency of the trapped microcluster also increases. Furthermore, the trapped</p><p>microcluster rotated faster as the laser power density increased regardless of the</p><p>microcluster's effective radius. To conclude, calix[4]arene in the form of a</p><p>microcluster can be optically trapped and respond to the circularly polarised light. The</p><p>strength of the optical stiffness and the magnitude of the rotatability of a trapped</p><p>calix[4]arene microcluster depend on the laser power density. This research implies</p><p>the broadening potential of light-manipulated calix[4]arene as a microprobe or</p><p>microactuator in a liquid.</p> |
|---|