Related Experiment Video
Updated: Jul 31, 2026
Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
Published on: November 25, 2009
Far-field characterization of small apertures.
1Storage Laboratory, Samsung Advanced Institute of Technology, PO Box 111, Suwon 440-600, Korea. petrovni@mail.ru
This study introduces a far-field optical method to measure small aperture sizes. The technique uses light beam intensity and spatial filters, showing smaller spot sizes with higher refractive index media.
Area of Science:
- Optics
- Photonics
- Materials Science
Background:
- Characterizing small apertures is crucial in optics and photonics.
- Existing methods may lack precision or require complex setups.
Purpose of the Study:
- To propose a novel far-field optical method for characterizing small apertures.
- To demonstrate the method's effectiveness using computer-generated holograms and spatial filters.
Main Methods:
- Utilizing the relationship between relative intensity of propagating modes and aperture size.
- Employing a simple optical setup with computer-generated holograms and spatial filters.
- Measuring axial intensity in the far-field zone.
Main Results:
- The minimal measurable spot size decreases with increased medium refractive index.
- Higher-order spatial mode filters enhance measurement resolution.
- Aperture diameters of tapered optical fiber tips were accurately determined.
Conclusions:
- The proposed far-field method offers a viable approach for aperture characterization.
- The technique is validated by comparison with scanning electron microscopy measurements.
More Related Videos
11:27Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
Published on: December 8, 2016
05:57Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
Published on: April 1, 2020