Conventional and propagation-based phase contrast imaging of nanostructures using femtosecond laser driven cluster plasma source and LiF crystal soft X-ray detectors

フェムト秒レーザークラスタープラズマ源とLiF結晶軟X線検出器を用いたコンベンショナルな伝播型位相コントラストナノ構造イメージング

Gasilov, S.*; Faenov, A. Y.; Pikuz, T.*; Skobelev, I.*; Boldarev, A.*; Gasilov, V.*; Magunov, A.*; 福田 祐仁; 神門 正城; 小瀧 秀行; 川瀬 啓悟; 河内 哲哉; 大道 博行; 田島 俊樹*; 加藤 義章* ; Bulanov, S. V.

Gasilov, S.*; Faenov, A. Y.; Pikuz, T.*; Skobelev, I.*; Boldarev, A.*; Gasilov, V.*; Magunov, A.*; Fukuda, Yuji; Kando, Masaki; Kotaki, Hideyuki; Kawase, Keigo; Kawachi, Tetsuya; Daido, Hiroyuki; Tajima, Toshiki*; Kato, Yoshiaki*; Bulanov, S. V.

Intensive source of soft X-ray emission was developed. Soft X-ray radiation was produced by femtosecond laser pulses irradiation of submicron size CO clusters. These clusters were produced in custom designed super-sonic nozzle from the mixture of the CO and He expanding gases. The LiF crystal soft X-ray detectors was used for registration of absorption images of ultrathin (nanoscale) foils and biological structures illuminated by the developed source. It was demonstrated that even if the foil is essentially transparent for the soft X-ray radiation (like 100 nm thick Zr foil), the image contrast could be significantly increased due to the influence of propagation-based phase-contrast effect, by placing the detector at the proper distance from the sample.