Register to reply 
Quanta of Light 
Share this thread: 
#1
Mar814, 06:21 PM

P: 14

Trying to understand small increments of light.
From a particle perspective, a photon is the smallest increment, dependent on frequency as E=hf. From Maxwell's wave perspective, light propagates as a result of the energy passing between the E field and the B field. The rate at which this occurs gives the frequency. So from a wave perspective, how short can a wave of light be? Less than one wavelength? If I have a source, a radio transmitter, that emits 10 1/4 lambda of light, and 10 lambda is received/filtered/reflected, can the 1/4 thats left when the filter is removed still propagate? 


#2
Mar814, 06:39 PM

Sci Advisor
Thanks
P: 4,160




#3
Mar814, 07:01 PM

P: 14

So if you cut monochromatic laser light off it will change frequency?



#4
Mar814, 07:11 PM

P: 14

Quanta of Light
Example, an extremely low frequency em wave, 0.1hz, if you take a 2.5 second burst is it not photons present in a 1/4 wavelength of a sinusoidal charge/magnetic field?



#5
Mar814, 07:12 PM

P: 14

laser light^



#6
Mar814, 07:17 PM

P: 14

I'm thinking about it in terms of a particle accelerator. If I use the 1/4 lambda above can I aim that at a proton and get it to accelerate due to the charge wave?



#7
Mar814, 07:29 PM

Sci Advisor
Thanks
P: 3,759




#8
Mar814, 08:52 PM

P: 14

Alright. So can I read any math that will describe this? the limit of the existence of the wave? The other effect I was interested in is the faraday effect... how sharply/irregularly can I twist a linearly polarised wave and keep it as propagating light?



#9
Mar814, 08:55 PM

P: 14

Feels like what im looking for are the mechanical properties of the ether?!



#10
Mar814, 09:36 PM

PF Gold
P: 272




#11
Mar1014, 06:14 PM

PF Gold
P: 92

If you want to learn more about these disturbances people keep referencing: http://hyperphysics.phyastr.gsu.edu...th/fft.html#c1
Of course, it depends on what filter you put on the signal, but in my experience* it tends towards a sinc function. *I have no experience. 


Register to reply 
Related Discussions  
Where do quanta come from  Quantum Physics  9  
Quanta of the other three forces  Quantum Physics  0  
Wave/Particle Duality in Light Quanta  General Physics  15  
Is there a quanta of time?  General Physics  15 