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Ultraviolet light to the extreme: Experiments may help in the design of new sources of extreme ultraviolet light

Date:
October 4, 2013
Source:
American Institute of Physics
Summary:
When you heat a tiny droplet of liquid tin with a laser, plasma forms on the surface of the droplet and produces extreme ultraviolet (EUV) light, which has a higher frequency and greater energy than normal ultraviolet. Now, researchers have mapped this EUV emission and developed a theoretical model that explains how the emission depends on the three-dimensional shape of the plasma. In doing so, they found a previously untapped source of EUV light.

Plasma generated by blasting droplets with a laser 6,000 times a second is shown.
Credit: ETH-Zurich/B.Newton

When you heat a tiny droplet of liquid tin with a laser, plasma forms on the surface of the droplet and produces extreme ultraviolet (EUV) light, which has a higher frequency and greater energy than normal ultraviolet.

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Now, for the first time, researchers have mapped this EUV emission and developed a theoretical model that explains how the emission depends on the three-dimensional shape of the plasma. In doing so, they found a previously untapped source of EUV light, which could be useful for various applications including semiconductor lithography, the process used to make integrated circuits.

In the experiments, Andrea Giovannini and Reza Abhari from ETH-Zurich in Switzerland blasted a 30-micron-diameter droplet of tin with a high-powered laser 6,000 times a second. They measured the spatial distribution of the resulting EUV emission and found that 30 percent of it came from behind the region of the droplet that was struck by the laser. According to their model, this unexpected distribution was due to the fact that the plasma partially surrounding the droplet was elongated in the direction of the laser pulse.

Devices that produce narrow beams of EUV for purposes like in semiconductor lithography use mirrors to focus the emission. But, until now, no one knew to collect the EUV light radiating from behind the droplet.

Thanks to this work, Giovannini said, future devices can exploit this previously unknown source of EUV emission. The new experiments can also inform the development of EUV devices by showing where mirrors should be placed around a droplet in order to collect and focus as much EUV light as possible.

The researchers describe their experiments in the Journal of Applied Physics.


Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. Z. Giovannini, Reza S. Abhari. Three-dimensional extreme ultraviolet emission from a droplet-based laser-produced plasma. Journal of Applied Physics, 2013; 114 (3): 033303 DOI: 10.1063/1.4815955

Cite This Page:

American Institute of Physics. "Ultraviolet light to the extreme: Experiments may help in the design of new sources of extreme ultraviolet light." ScienceDaily. ScienceDaily, 4 October 2013. <www.sciencedaily.com/releases/2013/10/131004125018.htm>.
American Institute of Physics. (2013, October 4). Ultraviolet light to the extreme: Experiments may help in the design of new sources of extreme ultraviolet light. ScienceDaily. Retrieved April 18, 2015 from www.sciencedaily.com/releases/2013/10/131004125018.htm
American Institute of Physics. "Ultraviolet light to the extreme: Experiments may help in the design of new sources of extreme ultraviolet light." ScienceDaily. www.sciencedaily.com/releases/2013/10/131004125018.htm (accessed April 18, 2015).

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