• Chinese Journal of Lasers
  • Vol. 41, Issue 12, 1208001 (2014)
Tong Junmin1、2、*, Zhou Shaolin2, Zhao Lixin2, and Hu Song2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3788/cjl201441.1208001 Cite this Article Set citation alerts
    Tong Junmin, Zhou Shaolin, Zhao Lixin, Hu Song. Angular Measurement Using Moire Interferometry for Alignment of Proximity Lithography[J]. Chinese Journal of Lasers, 2014, 41(12): 1208001 Copy Citation Text show less

    Abstract

    Interferometry is among the widely-used precise metrologies in varieties of science and engineering fields. An easy-to-control moire interferometric angular measurement method based on multi-diffraction of dual gratings is proposed, to facilitate tilt remediation and in-plane angle adjustment between mask and substrate in proximity lithography, as well as related applications in micro/nano devices and micro-optoelectronics system etc. This method aims to take advantages of symmetric and similar orders generated from dual-gratings diffractions to realize the (m, -m) and (m, 0) interferometry, in which fields with phase distribution associated with tilt and in-plane angle are formed. The fundmental of presented moire interferometry is derived in detail and related schemes of (m, -m) and (m, 0) interferometric measurement are introduced. Specifically, both schemes monitor the tilt and in-plane angle according to the fringe deflection and frequency variation in an on-axis and off-axis manner respectively. Corresponding composite gratings are designed for experimental verification. Experimental and analytical results indicate that the tilt and in-plane angle can be adjusted with an accracy below 10-3 rad and 10-4 rad, respectively.
    Tong Junmin, Zhou Shaolin, Zhao Lixin, Hu Song. Angular Measurement Using Moire Interferometry for Alignment of Proximity Lithography[J]. Chinese Journal of Lasers, 2014, 41(12): 1208001
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