3 ms·
Want to absorb some light? Why not make it fall on some black object! Want to absorb some specific frequency band? Add a dichroic filter to the setup.
by alok-g 16y ago
Want to absorb some light? Why not make it fall on some black object! Want to absorb some specific frequency band? Add a dichroic filter to the setup.
- mjnhbgvbn 16y agoWant to control whether a beam of light is transmitted or absorbed by the presence of another beam? Sounds like a transistor doesn't it? Did switching electrical signals with transistors ever lead to anything?
- alok-g 16y agoAs far as I understood reading the article a few times, this does not sound to have transistor action (for light) to me.
- iwwr 16y agoThe black object will re-emit the light with a blackbody spectrum (dependent on the temperature).
- alok-g 16y agoThey claim their method results in 99.4% absorption (even though theoretical number is higher). This does not look too hard for visible range. (But maybe for other frequencies, I don't know.) A typical HDTV with a contrast ratio better than 167:1 is already doing this using liquid crystal (uses polarization rather than a black object).