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.
Descriptors:
- *OPTICAL STORAGE
- *NEAR FIELD
- TEST AND EVALUATION
- COUPLING(INTERACTION)
- OPTICS
- THICKNESS
- DISTRIBUTION
- THEORY
- THIN FILMS
- INTENSITY
- LIGHT
- TEST EQUIPMENT
- OPTICAL PHENOMENA
- REFLECTION
- LASERS
- SURFACES
- GRATINGS(SPECTRA)
- SIGNALS
- SAMPLING
- SPLITTING
- RANGE(DISTANCE)
- AMPLITUDE
- STATICS
- PHOTODIODES
- EXITS
- BOTTOM
- DECAY
- IMMERSION
- SOLID BODIES
- LENSES
- PUSH PULL AMPLIFIERS
- LASER SPOTS
- AIR GAPS
Subject Categories:
- Computer Systems