Interesting article - vacuum UV lens

[Fandyus]

I found this and thought some of you might want to see.

 

https://phys.org/news/2022-05-metalens-disrupt-vacuum-uv.html

 

I don't understand much of it since I don't have scientific experience unlike many of you, but it sure seems interesting.

[colinbm]

Thanks Fandyus

[Andy Perrin]

Metamaterials are cool. There was quite a bit of interest in using them for invisibility a few years ago. Not sure if people got bored with that or perfected it…

[ulf]

1 minute ago, Andy Perrin said:

Metamaterials are cool. There was quite a bit of interest in using them for invisibility a few years ago. Not sure if people got bored with that or perfected it…

Difficult to tel if their invisibility became 100% 

[Andy Perrin]

Exactly, Ulf…

[dabateman]

I saw that,  but not too many people here are excited to illuminate in vacum UV.

I am still waiting for good super lenses using metamaterials with negative refractive index.

This was promising: 

 https://www.nature.com/articles/s41598-018-33572-y

[colinbm]

I wonder what VUV fluorescence looks like ?
Using a glass vacuum chamber would eliminate the ozone problem ?

[Fandyus]

13 hours ago, colinbm said:

I wonder what VUV fluorescence looks like ?
Using a glass vacuum chamber would eliminate the ozone problem ?

Well, I'd suspect that even reflective surfaces, such as metals, would start to fluoresce to some extent.

[Andy Perrin]

Metals won't fluoresce because they can't. You need to have either a band gap, or a finite number of energy levels, like in a molecule, to have fluorescence, and the defining characteristic of metals is that they don't have one -- electrons in a metal can have pretty much any energy they like. 

[Fandyus]

On 5/8/2022 at 3:16 AM, Andy Perrin said:

Metals won't fluoresce because they can't. You need to have either a band gap, or a finite number of energy levels, like in a molecule, to have fluorescence, and the defining characteristic of metals is that they don't have one -- electrons in a metal can have pretty much any energy they like. 

Ah well, there I go being outscienced again. Thanks for clearing that up.