I did my final presentation today - I'm finished my project! I still have to write my report for next Friday, but I have no more classes this term. I think my talk went pretty well overall. I wish I had been asked more questions - I had so much to say!
I did run the 980nm laser through the taper yesterday. I observed the exact same effects as with the 1460nm laser, but the fibre was not jumping (which is good). An example video is shown below with a modulated field and oscillating clump of beads. The camera can sense the 980nm light so we can see visually when the light field switches on and off.
Thursday, March 20, 2008
Finished!
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4 comments:
Apparently, it is not evanescent wave working on these beads. This is really strange. Congradulations of finishing your report!
Thanks - I'm delighted to be finished!
I wish I knew what was causing this. I just hope it's not something very trivial.
I can't start imagining what is causing this. Are your bead electrically charged? what is the size of them? The movement seems to be too fast to be due heat exchange.
I don't think this is a typical optical tweezers experiment. I'm not an expert, but I understand those use sub-micron particles and tend to trap them inside the beam.
Hi there opt-tech,
These beads weren't electrically charged - they were, as far as I can recall, made from some sort of polymer. Approx 5 micrometers in diameter.
Yes, the aim of the game was to trap the beads in the field. I should have observed the nearby beads being pulled towards the fiber and along the fober in motion with the evanescent field.
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