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A paraxial cloak with four lenses of different focal lengths
- Source :
- European Journal of Physics. 40:035303
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- We demonstrate cloaking with four lenses of different focal lengths. To achieve this, we compute the separation distances between lenses such that the effective ABCD matrix is equal to just a propagation in free space. Previously, calculations using this method are restricted to 2 pairs of lenses with equal focal lengths. Our computations, on the other hand, had no such restrictions: we generalize even with an asymmetric case. We derive expressions that show the dependence of the distances on the lenses and their focal lengths. Furthermore, we propose a way to minimize the length of this cloak. Our equations reduce to the Rochester cloak when its restriction is imposed. A general paraxial cloak could be useful in advanced undergraduate experiments in optics because: 1) the limit imposed by the focal length has been lifted; and 2) there is a pedagogical benefit of doing experiments with lenses beyond the usual imaging experiments such as reinforcing concepts in Gaussian optics.<br />Comment: 10 pages, 4 figures
- Subjects :
- Ray transfer matrix analysis
Physics
business.industry
Computation
05 social sciences
Paraxial approximation
Physics - Physics Education
Cloak
FOS: Physical sciences
Physics::Optics
050301 education
General Physics and Astronomy
Cloaking
01 natural sciences
Optics
Physics Education (physics.ed-ph)
0103 physical sciences
Focal length
Limit (mathematics)
010306 general physics
business
0503 education
Physics - Optics
Optics (physics.optics)
Gaussian optics
Subjects
Details
- ISSN :
- 13616404 and 01430807
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- European Journal of Physics
- Accession number :
- edsair.doi.dedup.....02a33e8bf07dd3e57d04031e31d40507