Brilliance scaling of discharge sources for extreme-ultraviolet and soft x-ray radiation for metrology applications

Markus Benk; Klaus Bergmann

doi:10.1117/1.JMM.11.2.021106

15 June 2012 Brilliance scaling of discharge sources for extreme-ultraviolet and soft x-ray radiation for metrology applications

Markus Benk, Klaus Bergmann

Author Affiliations +

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 11, Issue 2, 021106 (June 2012). https://doi.org/10.1117/1.JMM.11.2.021106

Abstract

Discharge based extreme-ultraviolet (EUV) sources have experienced significant progress in the last decade at different places. They are commercially available and are presently being used in scanners for EUV lithography and related development projects in the semiconductor industry. The technology has been proven to be scalable from a wavelength of 13.5 nm down to the water window spectral range (2.4 to 4.4 nm), which envisions a new generation of compact systems using soft x-rays and extreme ultraviolet (XUV) light for metrology, patterning, or microscopy. Especially for microscopy applications such as aerial imaging microscopy of EUV masks, a high brilliance is required. First results on the achievable brilliance of a gas discharge source in the XUV and soft x-ray range are presented. Currently, a brilliance of 12.9 W/(mm² sr 2% b.w.) at a central wavelength of 13.5 nm and 100 W/(mm² sr 4% b.w.) at 10.9 nm are achieved. For the 2.88-nm single emission line of nitrogen, the source produces 0.28 W/(mm² sr) or 4*109 photons/(μm2 sr s) at a spectral bandwidth of λ/Δλ = 840. Based on existing data, the potential of brilliance scaling is discussed.

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Markus Benk and Klaus Bergmann "Brilliance scaling of discharge sources for extreme-ultraviolet and soft x-ray radiation for metrology applications," Journal of Micro/Nanolithography, MEMS, and MOEMS 11(2), 021106 (15 June 2012). https://doi.org/10.1117/1.JMM.11.2.021106

Published: 15 June 2012

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