Apparatus and methods for providing phase controlled evanescent

Details Apparatus and methods for providing phase controlled evanescent Apparatus and methods for providing phase controlled evanescent

1996-08-21

1998-06-30

Hellner, Mark

Optics: measuring and testing

By polarized light examination

With light attenuation

356371, 356 401, G01B 1124

Patent

active

057742219

ABSTRACT:
Apparatus and methods for providing phase controlled evanescent illumination. The phase controlled evanescent illumination is useful for Imaging, metrology, and energy delivery. The light waves comprising the evanescent electromagnetic field are inhomogeneous in that their planes of equal phase are substantially perpendicular to the direction of propagation and to their planes of constant amplitude. The planes of equal phase are therefore normal to the surface to which the evanescent field is adjacent and to a sample surface illuminated by this field as well. Methods and means for dynamic or static phase shifting of inhomogeneous waves comprising the evanescent field are disclosed.

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