The Perfect Way to Capture Light Found.
If the absorption takes place in a thin layer of material that typically permits a significant amount of light to pass through, this becomes more difficult.
The Hebrew University of Jerusalem (HU) and TU Wien researchers have now uncovere an unanticipate technique that enables a laser beam to be entirely absorber even in the thinnest of layers. The light beam is direct in a circle and then overlaid on itself in a “light trap.” The researchers created a “light trap” around the thin layer using mirrors and lenses, in such a manner that the light beam stops itself and is unable to escape the system. The experiment was carry out by the lab team in Jerusalem, and the Vienna team provided the theoretical findings.
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The possibility of absorption rises as a result of the light’s repeated passage through the substance as it bounces back and forth between the two mirrors.
However, for this function to work, one of the mirrors must be relatively transparent; otherwise, no light will reach the space between the two mirrors. Professor Ori Katz of HU stated, “In our technique, we can cancel all back-reflections using wave interference.”
According to Helmut Hörner, from the Technical University of Vienna, who wrote his thesis on this topic, “In our method, too, the light initially hits a partially transparent mirror. As Yevgeny Slobodkin and Gil Weinberg explained, “The important thing is that the length of this path and the placement of the optical elements are adjusted in such a way that the returning light beam (and its numerous reflections between the mirrors) precisely cancels out the light beam reflected directly at the first mirror.”
The additional fraction of the beam passing through the system before returning to the partially transparent mirror prevents reflection.
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As a result, the mirror is completely transparent to the incident laser beam as opposed to only partially. The Hebrew University in Jerusalem conducted experiments that demonstrated the mechanism is immune to even air turbulence and temperature variations. It is clear from this that the effect is reliable and has a wide range of potential applications.
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