Timeline for Refractive properties of materials?
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Oct 20, 2015 at 21:00 | comment | added | DrMoishe Pippik | @Mithoron, thanks for comment on group veloicity... I stand corrected. | |
| Oct 20, 2015 at 17:15 | answer | added | mcocdawc | timeline score: 1 | |
| Oct 20, 2015 at 16:04 | comment | added | Mithoron | In your case they write that it's "made of silicon pillar arrays embedded in a polymer matrix and clad in gold film". | |
| Oct 20, 2015 at 11:27 | history | edited | Newbie | CC BY-SA 3.0 |
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| Oct 20, 2015 at 11:26 | comment | added | Newbie | @ Mithoron: I agree with you, but note that my question is more about how the refractive index is related to other physical and chemical properties (e.g. at least for liquids there is a correlation between the carbon residue and the refractivity), not so much how the "super-luminosity" is obtained. The later is a physical question, which is somewhat answered in the article withal. | |
| Oct 20, 2015 at 11:19 | history | edited | Newbie | CC BY-SA 3.0 |
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| Oct 20, 2015 at 0:26 | comment | added | Mithoron | @DrMoishePippik Actually group velocity isn't the exactly same as speed of information transfer and in specific situations isn't constrained with c, see en.wikipedia.org/wiki/Group_velocity#In_lossy_or_gainful_media | |
| Oct 20, 2015 at 0:17 | comment | added | DrMoishe Pippik | As @Mithoron states, the phase velocity can exceed C, just as the imaginary closing point of scissors or the apparent motion of stellar jets can be superluminal. However, the group velocity (speed of information) is limited to C. BTW, metamaterials can slow light to the speed it has in Pratchett's Diskworld. | |
| Oct 19, 2015 at 18:38 | comment | added | Mithoron | Refractive index is only connected with so called phase velocity of light - there's no problem with it having as high value as you wish, it could be another question, but off-topic here. Also metamaterials are composites, so it's not that much about synthesis or simple mixing. | |
| Oct 19, 2015 at 18:18 | comment | added | Newbie | If the above question is too general, I'll rephrase it to make them more concrete... | |
| Oct 19, 2015 at 18:17 | history | asked | Newbie | CC BY-SA 3.0 |