Difference between revisions of "Optical Tweezers"
| Line 53: | Line 53: | ||
<li> | <li> | ||
<table> | <table> | ||
| + | <thead>Stoke's Drag Force Measurements</thead> | ||
<th>Beam Power (mW)</th> | <th>Beam Power (mW)</th> | ||
<th>Escape Velocity (microns/second)</th> | <th>Escape Velocity (microns/second)</th> | ||
| Line 59: | Line 60: | ||
<td>5.5</td> | <td>5.5</td> | ||
<td>20.57</td> | <td>20.57</td> | ||
| − | <td>0. | + | <td>0.44</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>8.5</td> | <td>8.5</td> | ||
<td>33.49</td> | <td>33.49</td> | ||
| − | <td> | + | <td>0.72</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>11.7</td> | <td>11.7</td> | ||
<td>40.00</td> | <td>40.00</td> | ||
| − | <td> | + | <td>0.86</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>15.3</td> | <td>15.3</td> | ||
<td>62.60</td> | <td>62.60</td> | ||
| − | <td> | + | <td>1.34</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>19.0</td> | <td>19.0</td> | ||
<td>84.71</td> | <td>84.71</td> | ||
| − | <td> | + | <td>1.82</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>23.0</td> | <td>23.0</td> | ||
<td>110.77</td> | <td>110.77</td> | ||
| − | <td> | + | <td>2.38</td> |
</tr> | </tr> | ||
</table> | </table> | ||
Revision as of 18:57, 28 May 2014
Contents
Optical Tweezers
Resources
- [1] Directions on how to use a QPD in an optical tweezer setup.
- [2] Here are some slide prepping instructions from Berkeley.
Our own setup
- Here's how we did our Slide Set-Up.
Using NI Vision Assistant
- [3] Image Acquisition/Saving Images
-
[4] How to track the microspheres in NI Vision Assistant using pattern matching.
- We recommend not doing it using pattern matching and either brute force point and click track the spheres, or use the QPD to record position. The pattern matching gave variable results.
Our calculations using Brownian Motion
-
2.56 micrometer spheres
- 4.6 mW Beam [5]
Calculating Trap Forces Using Stokes' Drag Force
- [6] iPython Calculations
-
<thead>Stoke's Drag Force Measurements</thead>
Beam Power (mW) Escape Velocity (microns/second) Trap Force (pN) 5.5 20.57 0.44 8.5 33.49 0.72 11.7 40.00 0.86 15.3 62.60 1.34 19.0 84.71 1.82 23.0 110.77 2.38 -
