Interesting Circuits (Polarized Material) 002

[72fr250]

They use this effect for filtering lights for movies. Light travels as electromagnetic radiation. So it's basically two waves of energy traveling at right angles to each other. Each piece of polarized material blocks either the light portion of the wave(photon), or the other half of the wave; depending on the angle at which you hold the material. So two pieces at 90 degrees to each other effectively block out all light.

[quietthomas]

Double U, to the T to the fuck is up with dis shit?

[kubikop]

Weird isnt it!

[rroge5]

this has many applications.

[kubikop]

Yeah, its kewl isnt it.... ;-)

[Films4You]

I guess the one under is actually twisting the light so that it can pass through the top one, maybe...

 I'm no expert :)

[kubikop]

May be your right, but light is meant to travel in a straight line??

I'm no expert either I just find it hard to believe that light travels in straight lines apart from when you have bits of plastic with small lines drawn on them? which is effectively what polarized material is...

Weird Huh! I Just want to make people think....

Thanks for watching.

Paul.

[sparkyprojects]

On the right track i think

Take just the top one and the one behind, you will get half brightness as they are at 45 degrees, then you take the one behind and the screen, those are at 45 degrees too and will pass half the light.

however, if you put the second one in front, at some stage the difference is 90 degrees so light won't pass

True that light travels in straight lines, but as a wave, think of a rope being shaken through a 'grid', if the grid is inline, the rope moves like a wave

[RupertsCrystals]

Paul, there's even more stuff that can be demonstrated than what you have shown here.

Try inserting other objects between the two polarising filters, instead of the third filter. I recommend a sheet of cellophane to start with.

There's a whole world of fun stuff with this.

You hit on it with the windscreens comment; the effect is only visible when there is natural polarised light (from the blue sky usually) passing through the windscreen and then through your polarised glasses.

[AdminOnDuty]

I think what Paul is asking here, is if two polarizers block 100% of the phasing, then how can a third inserted between them 'unblock' it? Part of the answer lies in the fact that the photon leaving the screen is not the same photon that hits the camera. The other part of the answer lies in how the material releases energy that chain reactions through it and what angle it is re-emitted at. It would appear that this material re-emits at min 0-45° shift. So if your in that window, it will pass.

[AdminOnDuty]

[Other comment deleted for typos.]

So, if the photon polarization is shifted from sheet A 45° and again shifted by sheet B 45°, then sheet C will also accept that energy and re-emit it 45° shifted. Of course the camera sensor is not polarized, so it will accept the photonic energy whether it is 0° or 135°. And this case, the 3 layers shift the energy 135°. Two sheets rotated less than 45° will probably pass quite a bit of light. Adding more...well you get the picture ;-)

[janne808]

You should google up "vega science trust richard feynman" for a nice layman lecture on this stuff.

[kubikop]

Thanks, Ill have a look at the lectures with an open mind...

Paul.

[janne808]

The answer lies in probability amplitudes and photon polarization. Photons only come in certain polarizations, like in this case photons are only polarized in 'x' and 'y' directions. They can't be polarized as something in between, but the state vector can be in any superposition of those two.

[kubikop]

I think I get what you mean, When X vector equals the Y Vector then only a sheet at 45 degree will enable the light to pass at best efficiency.

The map is never the territory and the model is never the mind. Im thinking This may be able to be used in a way not thought of yet. Can you think of a way that would show magnetic field lines from filters? They do not have to be Polarized just seen....

Paul..

[nedkiller]

This results in light being able to travel right through. when only one 90 degree filter is used the light cannot twist this dramatically and so bounces off. This is probably linked with the idea of the path of least resistance - if it takes less energy to rotate and pass through it will, otherwise it will bounce off. Like I said, this is all conjecture on my part. I have no scientific backup. It is however the only logical way to explain this effect as far as I can think of.

[kubikop]

I only did this video cause I do not understand it, I wanted to discuss it. I think you may be right with the path of least resistance, optics is meant to be a closed subject..... ie they know all they could possibly know about it. Then how come we never got shown this at school? Maybe they did not have laptops back then? :p

[Drevtoobe]

Hey Paul, I'd love to comment, but what happens when you change the angle of the 45-degree piece of plastic while it is underneath the top piece? Does it only work at 45 degrees or can you change the angle?

Your comment about optics is shocking! lol Just search on "Photonics Spectra". There is an unbelievable amount of stuff going on in optics. If you post your question in a forum there for sure you will get your answer.

[Drevtoobe]

Just for fun, I am going to take a stab at an answer. I am going to assume that as you change the angle of the 45-degree piece that it will go opaque in the same way a single piece does. i.e.; if the screen is horizontally polarized and you line up two vertically polarized pieces it will be dark.

I think what happens is the 45-degree piece lets through some horizontal light from the screen. That light bounces around between the two pieces of plastic (the partial reflections).

[Drevtoobe]

So the reflecting/bouncing around "mixes up" the horizontal light so that it's not just horizontally polarized anymore. Some of the mixed-up light is vertically polarized, and hence it travels through the top piece and you see the screen.

If you touch the two pieces and apply pressure (careful your laptop!) then you might see it get darker because some of the plastic will be touching, eliminating the internal reflections. Just a guess!!!

[kubikop]

Again I understand the model but would like to do the practical before I would comment on it. It just does not figure... It may be as janne808 says but I wont believe it just because It has been said to be so by Mr X at Y institute. A model is a model and they are never fixed, only the easiest way to understand the concept at the time....

Paul..

[kubikop]

I am away for a few days but will either buy another calculator or try your experiment once I get home.....

Paul

[kubikop]

I know optics is not a closed subject. I have a text book that was in print that says so though. I was kinda saying that everything is just a model and time is the only Factor to finding new things. Laptops did not exist now they do and as far as I can Tell all LCD Screens including Phones have Polarized Screen, Ned Killer was trying to say he did not have the ability to do it "tongue in cheek" but there is always a way to find things out, knowledge is the only richness you can ever have!.

[nedkiller]

so in your example while the filter is only designed to accept one type of light other orientations are 'twisted' slightly and allowed passage.

Or at least that is my take on it. Does that make any sense?

[kubikop]

Yeah, That does make sense....although,

I do not think that light spins though? Its the second piece that comes between the plates.

So light can only orientate (or is polarized) at the horizontal.

Then Add another where it only orients at the vertical.

Put a piece in between them. Should still block the light from the Horizontal and vertical.

Why does the 45 degrees plate make it act not like you would expect light not to?

Paul

[nedkiller]

No, I havent tried it due to lack of a laptop with a polarised screen :p

I dont think that light spins either, rather it is made to rotate in this case by the filter. The polarised light comes from the screen in a vertical orientation say, hits the first filter at 45 degrees- some bounces off while some is deflected sufficiently to allow it passage through the material. The light wave leaves this material twisted by 45 degrees. It meets the second horizontal filter and the same thing happens.

[nedkiller]

However because you have removed all but one orientation of light, unless that filter lets that one orientation of light through it will let no light through at all.

when you insert it at 45 degrees it is close enough to the required orientation that the light will pass through. think of it like stairs, 1 90 degree step is too far, 2 45 degree ones are small enough for the light to manage.

[kubikop]

Close enough? Im thinking it must be a straight line, I can appreciate what your saying but it should block the light and its just not happening...

Have you tried it?

Paul.

[nedkiller]

Light waves have an orientation. A polarizing filter is like a screen of slots that only lets light through if it is oriented in a certain way. therefore the light coming from the screen consists of only light in one orientation.

||||||||||||||||||||||||||||||­||||||||||| instead of |/|-\|-/\|||/\\\/

if you then add another filter on top of that it will do the same thing again.

[kubikop]

Yeah, so Almost no light comes through the two filters at 90 degrees to each other.

[flashback1234]

That's cool!

[kubikop]

Cheers..

[InventorGadget]

well, basically you just UN-polarize the light with the 45-degree sheet u place in-between, thats all.. but its a cool effect :)

[kubikop]

I think that more is going on here, but that is just my opinion.

Have you tried it?

Paul.

[lvecsey]

the key is you put a sheet across the entire laptop first, which acts as one constraint. then the small piece taped down at 90 degrees will block the vast majority of light transmission, and as you demonstrated it doesn't matter what goes on top of it at that point.

if you put another piece in-between as you did, the outer layer starts to transmit again. you might have to rotate the outer layer (the one taped down) by say another 45 degrees to get back to an opaque situation, end-to-end.

[kubikop]

But how does the light know how to go through the material if it travels in a straight line?

My point is that the laptop has a sheet of polarized material in the screen, If that light is blocked by another sheet stuck at 90 degrees.

How does putting a piece between the screen and the 90 degree sheet, enable the light to go through?

I tried your cylinder and it still works but only on the two ends as the side walls have in effect two sheets plus the third one.

How does the light get through?

[Pirate88179]

Paul:

I really don't know where you get all of your great ideas but....keep them coming! What about a 2 panel layer that is adjustable from 90 and 90 to 45 and 90? (and everywhere in between) I need to have a beer with you one day. Excellent job!

Bill

[kubikop]

I think some private jets use theses for window shields for the passangers, I remember "Richard Bandler" saying somethink about it or was it "Robert Anton Wilson" two people everyone should read about.....

[entune85]

very interesting indeed. i will for sure be trying this experiment out myself!

I wonder though, could you use this to possibly make sun glasses, if yes then could you also use it to make a visible one way only window?

there might even be some commercial value to this!

[kubikop]

I have some polarized glasses, I use them on my bike and sometimes when browsing that when I noticed if I tilted my head the screen went off....

[CrismaFire]

cool I knew it would darken but I never knew at 45 degrees it would reappear.

[kubikop]

I think we are either discovering something about polarized materials or light!

At least we are discovering, try it and make a video link...

Paul.

[tjgame2]

Wow!

[kubikop]

I know! Try it its got to be worth the price of a calculator......

Paul.

[30GB]

cool and very wired at the same time lol im might try this

[kubikop]

Nice one when you do it has to be 45 degrees at the angle and it must be between the two plates.

Video link when you try it....

You can see defects in plastics, I was on my motorbike with my sunglasses on and the visor down and you can see peoples windscreen like a trippy blue glow where I think the stress fractures are and different patches of tarmac standout like really mad.....

Ill do a video if I can tape it in my helmet well enough..

Paul.

[budsiskos]

very interesting

[kubikop]

I know Im mesmerized by it.

If you buy a cheap large display calculator (Bout a £1) and get a sharp snap off Blade you can remove the Material quite easily.

Cut it into two or three and you'll be just as shocked!

They are meant to be the equivalent of a plastic with lines draw on them so how does it get through the in between layer?

If Light is a wave and a Particle then this shows its at least a wave, very quantum heh....

Paul