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Illumination optical system, exposure apparatus and device manufacturing method

  • US 10,168,620 B2
  • Filed: 12/23/2016
  • Issued: 01/01/2019
  • Est. Priority Date: 06/19/2010
  • Status: Active Grant
First Claim
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1. An illumination optical system which illuminates an illumination target surface with illumination light, comprising:

  • a polarization member arranged on an optical path of the illumination light, the polarization member configured to set a polarization state of first partial light serving as first part of the illumination light into first linear polarization having a polarization direction along a first direction and set a polarization state of second partial light serving as second part of the illumination light into second linear polarization having a polarization direction along a second direction, the second part being different from the first part, the second direction being different from the first direction;

    a reflecting surface arranged on the optical path of the illumination light, the reflecting surface configured to reflect the first partial light and the second partial light, the polarization direction of the first linear polarization serving as s-polarization or p-polarization with respect to the reflecting surface; and

    a phase member provided downstream on the optical path from the polarization member and configured to emit the second partial light while providing a phase difference between polarization components in the second partial light and emit the first partial light while maintaining the polarization state of the first partial light in the first linear polarization, polarization directions of the polarization components in the second partial light being orthogonal to each other.

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