Overcoming the Abbe Diffraction Limit Using a Bundle of Metal‐Coated High‐Refractive‐Index Sapphire Optical Fibers
Source abstract
Abstract
Abstract While fiber bundles attract much interest in optics, their resolution is limited by the individual fiber size, which can be as large as a wavelength λ for common fiber optics materials. In order to increase fiber bundle resolution, in this work, high‐refractive‐index sapphire fibers with n > 3 are employed in the terahertz (THz) range, which ensures strong confinement of the guided modes and enables a fiber bundle resolution beyond the 0.62λ Abbe limit of free space optics. A sapphire fiber bundle is fabricated and its advanced resolution is experimentally demonstrated, using both analysis of the pair correlation function of the disordered fiber packing and continuous‐wave THz imaging. The resolution vares across the aperture with the mean value of 0.53λ, while, at certain regions of the bundle, it is as low as 0.3λ. The developed principles can be translated to any spectral range where high‐refractive‐index fiber optics materials are available.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Terahertz technology and applications · Photonic and Optical Devices · Photonic Crystal and Fiber Optics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Prokhorov General Physics Institute of the Russian Academy of Sciences Vavilova str. 38 Moscow 119991 Russia
Bauman Moscow State Technical University 2nd Baumanskaya str. 5/1 Moscow 105005 Russia
Institute for Regenerative Medicine Sechenov First Moscow State Medical University Bolshaya Pirogovskaya str. 19/1 Moscow 119146 Russia
Institute of Solid State Physics of the Russian Academy of Sciences Russia
Saratov State University Astrakhanskaya str. 83 Saratov 410012 Russia
Institute of Precision Mechanics and Control of the Russian Academy of Sciences Rybakova str. 24 Saratov 410028 Russia
Department of Engineering Physics Polytechnique Montreal 2500 Chemin de Polytechnique Montréal QC H3T 1J4 Canada
Funding
Russian Science Foundation
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