Fabrication of quantum dot array diffraction grating for soft x-ray spectroscopy

Min Zhao; XiaoLi Zhu; Baoqin Chen; ChangQing Xie; Ming Liu; Leifeng Cao

doi:10.1117/12.782916

21 November 2007 Fabrication of quantum dot array diffraction grating for soft x-ray spectroscopy

Min Zhao, XiaoLi Zhu, Baoqin Chen, ChangQing Xie, Ming Liu, Leifeng Cao

Proceedings Volume 6724, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems; 67241O (2007) https://doi.org/10.1117/12.782916
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

A novel diffractive optical element (DOE), quantu-dot-array diffraction grating(QDADG), used in soft X-ray spectroscopy has been fabricated for the first time. The QDADG, which consists of a large number of quantum dots distributed on a substrate as sinusoidal function, has many advantages in theory over conventional transmission grating (TG) in soft X-ray spectroscopy, such as doubtless diffraction efficiency, no higher-order diffraction and no subordination diffraction maximum, and so on. So, it can be predicted theoretically to improve the precision and Signal Noise Ratio of soft X-ray spectroscopy in laser plasma diagnosis. But, there are many difficulties in the fabrication of soft X-ray spectroscopy QDADG because of its much small dimension and complex pattern. In this paper, a combined lithography was proposed to fabricate QDADG including electron beam lithograph (EBL) and proximity X-ray lithograph(XRL). The diffraction property of QDADG has also been proved to be consistent with theoretical prediction from test experiment. In the process of fabrication, because of the thin film substrate of soft X-ray QDADG, the backscattering of incidence electrons can be effectively restrained in the electron beam lithograph, which can cause much higher resolution. Without proximity effect correction, QDADG with 250nm minimal unit has been successfully fabricated. In order to further increase the spectroscopy resolution and dispersion power of QDADG, it is necessary to carry out proximity effect correction in electron beam lithograph.

Citation Download Citation

Min Zhao, XiaoLi Zhu, Baoqin Chen, ChangQing Xie, Ming Liu, and Leifeng Cao "Fabrication of quantum dot array diffraction grating for soft x-ray spectroscopy", Proc. SPIE 6724, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, 67241O (21 November 2007); https://doi.org/10.1117/12.782916

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KEYWORDS

X-rays

Spectroscopy

Diffraction

Electron beam lithography

X-ray diffraction

X-ray lithography

Gold

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