'Sonic Boom' Of Light Captured For The First Time Ever

Using photon to see photon, what a nice method.

Actually, when we see the header we can expect that thisnis similar to sound which big particles go over sound speed. However, it is not like that. They just see some clouds which is almost similar with the general sonic boom. So they called it photonic boom.

Lets calculate it is convenient or not to see sibgle photon. Before this actually, some researchers can capture the light inside the high index waveguide but theybdo not use real time capturing. They capture lots of frames and when they combine these frames you can see how light goes inside waveguides. We know that each photon has same phase and polarization means spatial and temporal coherence and they do not need a single photon to capture the photon. This was the idea.

Here i think it is different. They capture with really high speed camera which has a 100 billlion frames per second. Ok lets start the calculation: consider there is no slowing down the speed of the photon. Then we have a 3x10^8 m/s speed. I saw that 5mm waveguide. Then it goes this length in almost 2x10^-11 seconds. It means 20 ps. Now lets calculate the how many camera can take frames in 20ps. It says, in second, 100.000.000.000 frames. It means 10^11 frames. It means that, in 20ps time, the camera has a 2 frames. Yes we conclude that it can be done with this camera. Also they say that they slow down the speed of light by using high index material. So we can calculate also the refractive index from the movie. We can see that the photon pass in 250 ps for 5mm. It means that the speed of light is almost 3x10^7 m/s. So the index is must 10. These are roughly calculations dont worry:))

Thanks for the quality post. Have a curious day...