Photonic Crystals Basic

[@stevesloan6775]

Super interesting topic. Photonic Crystals in nature are truly incredible. I love how butterfly wings do not have any pigment colour, rather bending the speed of light to simulate the desired colour.

[@meetoptics]

This are the kind of presentation that photonics field needs to approach society and make people understand how our lives may improve thanks to scientific innovations. From MEETOPTICS we are proud to be part of the photonics community and to help engineers and researchers in their search for optical lenses through our site. We celebrate every step forward. Congratulations!

[@sandrawong6787]

Are these things made of light itself?

[@koktszfung]

Ok course not what the heck 😂

[@sandrawong6787]

@@koktszfung yea I was just thinking if we could do that.. Would it be possible by any means...?

[@trenvert123]

It's not as a ridiculous question as others may think. solid light, or hard light is a hypothetical material currently, and while there are experiments ongoing to produce it, we may have a long way yet to create it.

[@sandrawong6787]

@@trenvert123 wow that's really interesting to see after three years haha Maybe using electromagnetic resonance? Given light can already interact with stuff like solar sails it's really not impossible to touch an object made out of light The possible uses might only look like green lantern projections but I'm sure other fields could use it too

[@kavandave3971]

Let me start my comment by expressing my deepest gratitude to you for this informative video. I am actually a noob in photonics and I had one minor doubt, at 1:52, you said that by treating like a periodic medium we can fold the wavenumber, can you please tell me why? I searched the video about Floquet theory and Bloch theorem but was not able to understand it. I would be immensely grateful to you. Thank you. Have a nice day!

[@pseudolullus]

I am late, but just in case anyone else has this question, the waves traveling thru the crystal follow the solutions to an eigenvalue problem. Only normal modes and some of their superpositions survive the wave interference festival, these waves happen when all points vibrate at the same frequency. Therefore, the k's are periodic too, not just the crystal, and k's become equivalent every 2pi/a distance (in k-space, and where a is the spacing btw dielectric regions).

[@ernestoborrego9593]

Thank you for the video, but why did you put the figure at 1:34 ? What is omega? what is k and a? You didn't explain them, they are meaningless to me. Wavenumber vs. frequency? which one is which? I can make a guess but I'm not a physicist and the point of this video surely is to explain the concept to someone outside of your field, right?

[@saniamushtaq4789]

what is the source of this video.

[@trenvert123]

Work cited is at the end of the video.

[@dotaapso]

thx for video

[@brunofracs]

The audio on this is horrible