| 摘要 |
A new generalized phase contrast (GPC) system is provided that is designed for non-monochromatic electromagnetic waves, comprising • a source (12) of electromagnetic waves for emission of electromagnetic waves with a plurality of wavelengths A, • a phase modifying element (18) with an input surface (x, y) positioned so that the electromagnetic waves are incident upon it and configured for phase modulation of the electromagnetic waves impinging on the surface (x, y) by phasor values e i ϕ(λ, x, y) • first Fourier or Fresnel optics (29) positioned so that the phase modulated electromagnetic waves are incident upon it and configured for Fourier or Fresnel transforming the phase modulated electromagnetic waves, • a spatial phase filter (22) with a surface S positioned at the Fourier or Fresnel plane of the first Fourier or Fresnel optics, respectively, and having phase shifting regions (xs, yS) configured for phase shifting Fourier or Fresnel transformed electromagnetic waves with different wavelengths A incident on the respective phase shifting regions (xs, yS) by predetermined respective phase shift values 6(h, xs, yS) with relation to the remaining part of the respective Fourier or Fresnel transformed electromagnetic waves incident on parts of the surface S without a phase shifting region, and second Fourier or Fresnel optics (26) configured for forming the intensity pattern I (A, x', y') by Fourier or Fresnel transforming the Fourier or Fresnel transformed electromagnetic waves. |
