Accession Number:

ADP011835

Title:

Static Tester for Characterization of Optical Near-Field Coupling Phenomena

Descriptive Note:

Corporate Author:

PHILIPS RESEARCH LABS EINDHOVEN (NETHERLANDS)

Personal Author(s):

Report Date:

2000-01-01

Pagination or Media Count:

7.0

Abstract:

We present an experimental set-up for systematical studies of optical near-field coupling phenomena using a solid immersion lens SIL to surpass the conventional far field diffraction limit. The set-up incorporates a microscope objective lens with NA0.80 in combination with a hemispherical SIL manufactured from glass with refractive index n1.887 and a laser with a wavelength of 430 nm. Test samples are positioned within the evanescent decay distance from the bottom surface of the SIL using a closed-loop-controlled piezo actuator. The laser spot can be scanned over the sample enabling a study of the push-pull signal of pregrooved samples on a split photodiode. The intensity distribution and polarisation state of the light reflected from the sample in the exit pupil of the microscope objective lens is studied on a CCD camera. The reflected light can be combined with a reference beam into an interferogram used for alignment purposes. We present measurements of evanescent coupling of light to a glass sample and the push-pull signal of a reflective phase grating with a groove pitch of 300 run as a function of thickness of the air gap between de SIL and the sample. The evanescent coupling to a glass sample can accurately be described by thin-film optics theory. Experiments show that the push-pull signal amplitude depends on the polarisation state of the irradiating beam.

Subject Categories:

  • Computer Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE