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Old 01-25-2010, 08:12 PM #1
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Default A Few Examples of Optical Trapping

There have been several optical trapping threads recently, but I thought I'd put one in the "Science" category.

YouTube - Optical Trapping

I have a full write-up and some highish res pics here:
Optical Trapping and the Momentum of Light @ JWC.blog


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Old 01-26-2010, 02:24 AM #2
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Default Re: A Few Examples of Optical Trapping

Very interesting video. I would love to know what causes this phenomenon. +rep to you.
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Old 01-26-2010, 03:06 AM #3
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Default Re: A Few Examples of Optical Trapping

Early tractor beam????
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Old 01-26-2010, 04:22 AM #4
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Default Re: A Few Examples of Optical Trapping

All info is there!

For more information on optical trapping and some high resolution shots, see my blog entry at:
Optical Trapping and the Momentum of Light @ JWC.blog

These are a few short clips illustrating the phenomenon of optical trapping. Essentially, a felt tip marker is briefly burned just above the focal point of a ~250mW 650nm laser, releasing an extremely small particle. This is not the intersection between the laser and some smoke; it's an actual particle embedded in the laser beam.

Because radiation can exert pressure on objects, there is a set of force vectors always keeping the particle just above the waist of the beam. This phenomenon illustrates how light can behave as particles (photons) because the photons have momentum and are therefore able to impart forces onto objects. It is even possible to move the laser around gently and the particle will follow along.

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Old 01-26-2010, 03:29 PM #5
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Default Re: A Few Examples of Optical Trapping

Very clear video!

I'm still wondering why it works so well with those markers, few other materials seem to work reliably. Perhaps its somehow sputters out some droplet of ink, the solvent evaporates and what remains gets trapped?
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Old 01-26-2010, 07:33 PM #6
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Default Re: A Few Examples of Optical Trapping

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I'm still wondering why it works so well with those markers, few other materials seem to work reliably. Perhaps its somehow sputters out some droplet of ink, the solvent evaporates and what remains gets trapped?
That's one possibility; it certainly seems plausible. I've heard that very soft plastic is also effective, so I would imagine that pieces of the felt are just breaking off. You could see by taking some black felt and trying the same way. If it doesn't release particles as well, then it's probably the ink.
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Old 01-27-2010, 12:08 AM #7
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Default Re: A Few Examples of Optical Trapping

Soft plastics could have plasticizers serving the same function to some degree - i suppose.

I've tried to replicate the results using various materials, but none worked as well as the markers in the videos. Things like electrical tape will allow you to catch a particle once in a while, but very far from the almost 100% successes displayed using these markers.
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Old 01-27-2010, 03:27 AM #8
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Default Re: A Few Examples of Optical Trapping

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Originally Posted by Benm View Post
Soft plastics could have plasticizers serving the same function to some degree - i suppose.

I've tried to replicate the results using various materials, but none worked as well as the markers in the videos. Things like electrical tape will allow you to catch a particle once in a while, but very far from the almost 100% successes displayed using these markers.
Yup. I wonder if the particles being trapped in the case of the electrical tape are from the adhesive.

It appears that my video has been posted on Reddit, so whichever one of you did that: thanks!
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Old 01-27-2010, 03:42 AM #9
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Default Re: A Few Examples of Optical Trapping

cool
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Old 01-27-2010, 03:45 AM #10
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Default Re: A Few Examples of Optical Trapping

This is very hard to do just try it your self and see....
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Old 01-27-2010, 04:56 PM #11
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Default Re: A Few Examples of Optical Trapping

Maybe its carbon.
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Old 01-27-2010, 05:21 PM #12
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Default Re: A Few Examples of Optical Trapping

The actual particle probably is... or at least something rather carbon rich like soot or tar.

What's difficult is getting it trapped there - the beam doenst just trap any particle that floats through it. If that were the case it could easily trap particles from smoke by just blowing smoke slowly through the waist of the beam.

I suppose another aspect is that the particle has to be big enough to see... if you capture something much smaller than the wavelength, it might be trapped, but will hardly be visible. On the other end particles obviously get too heavy to remain trapped, so it seems to be a fine balance.
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Old 01-27-2010, 05:48 PM #13
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Default Re: A Few Examples of Optical Trapping

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The actual particle probably is... or at least something rather carbon rich like soot or tar.
Sorry, that's what I meant.
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Old 01-27-2010, 06:18 PM #14
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Default Re: A Few Examples of Optical Trapping

You can buy an optical trapping kit,, if you don't want a new car. And with 330mW of 980nm it generates a whopping 1 pN! if everybody in the US (300 million) bought one, they could lift together a single grain of rice!
Impressive, isn't it?
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Old 01-27-2010, 06:25 PM #15
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Default Re: A Few Examples of Optical Trapping

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You can buy an optical trapping kit,, if you don't want a new car. And with 330mW of 980nm it generates a whopping 1 pN! if everybody in the US (300 million) bought one, they could lift together a single grain of rice!
Impressive, isn't it?
Looks like they are using the same principal for optical tweezers.





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Old 01-28-2010, 05:37 PM #16
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Default Re: A Few Examples of Optical Trapping

Yes, it is really cool thing! I like it too:
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