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- Title
Diffraction limited collimation of 1550 nm Gaussian beam from a single mode fiber using cylindrical metalens.
- Authors
Majumder, Sambuddha; Ravindran, Sooraj
- Abstract
Optical fibers play a crucial role in various fields, including free-space optical communication and quantum communication. The beam coming out of the fiber facet, unfortunately, has a very high divergence angle. This divergence can be problematic, especially when coupling the light into free space or to other optical components that require collimated beams. The beam divergence can be reduced and the beam can be shaped with the help of suitable collimating optics, which serves as the coupler to couple light between fiber and free-space. However, these traditional collimating optics consists of lenses that are generally spherical in nature and are limited in their ability to shape the phase of the beam as they can provide only a spherical phase to the incoming Gaussian beam from the fiber. This limitation can be overcome by using metasurfaces, which can shape the phase of the beam in a more tailored manner. In this paper, we have designed the metalens that can be directly formed on the fiber facet and can collimate the 1550 nm beam coming out of the single mode fiber facet with the use of two different kinds of cylindrical metalens. These metalens can reduce the beam divergence and can achieve diffraction limited collimation while maintaining a transmittance of ≥ 95 %.
- Subjects
GAUSSIAN beams; FREE-space optical technology; QUANTUM communication; OPTICAL fibers; SINGLE-mode optical fibers; FIBERS
- Publication
Optical & Quantum Electronics, 2024, Vol 56, Issue 6, p1
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-024-06958-8