Plasma physics and radiation hydrodynamics in developing

Katsunobu Nishihara, Atsushi Sunahara, Akira Sasaki, Masanori Nunami, Hajime Tanuma, Shinsuke Fujioka, Yoshinori Shimada, Kazumi Fujima, Hiroyuki Furukawa, Takako Kato, Fumihiro Koike, Richard More, Masakatsu Murakami, Takeshi Nishikawa, Vasilii Zhakhovskii, Kouhei Gamata, Akira Takata, Hirofumi Ueda, Hiroaki Nishimura, Yasukazu IzawaNoriaki Miyanaga, Kunoki Mima

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)


Extreme ultraviolet (EUV) radiation from laser-produced plasma (LPP) has been thoroughly studied for application in mass production of next-generation semiconductor devices. One critical issue for the realization of an LPP-EUV light source for lithography is the conversion efficiency (CE) from incident laser power to EUV radiation of 13.5-nm wavelength (within 2% bandwidth). Another issue is solving the problem of damage caused when debris reaches an EUV collecting mirror. Here, we present an improved power balance model, which can be used for the optimization of laser and target conditions to obtain high CE. An integrated numerical simulation code has been developed for the target design. The code agrees well with experimental results not only for CE but also for detailed EUV spectral structure. We propose a two-pulse irradiation scheme for high CE, and reduced ion debris using a carbon dioxide laser and a droplet or a punch-out target. Using our benchmarked numerical simulation code, we find a possibility to obtain CE up to 6-7%, which is more than twice that achieved to date. We discuss the reduction of ion energy within the two-pulse irradiation scheme. The mitigation of energetic ions by a magnetic field is also discussed, and we conclude that no serious instability occurs due to large ion gyroradius.

Original languageEnglish
Article number056708
JournalPhysics of Plasmas
Issue number5
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Condensed Matter Physics


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