Dynamic double slits for topological charge determination
In this study, we verified experimentally the mathematical expression we derive that generally characterizes the diffraction of a Laguerre-Gaussian beam by a double slit. We find that for a topological charge l, the interference fringes shift by l orders and that the direction of the shifting depends on the sign of l. The shifting effect can be used to determine the sign and the magnitude of the topological charge of a vortex beam, as long as, the distance between the slits is optimal. With a digital micromirror device (DMD) which acts as a dynamic slit, the optimal distance between the slits can be easily determined.
By submitting their manuscript to the Samahang Pisika ng Pilipinas (SPP) for consideration, the Authors warrant that their work is original, does not infringe on existing copyrights, and is not under active consideration for publication elsewhere.
Upon acceptance of their manuscript, the Authors further agree to grant SPP the non-exclusive, worldwide, and royalty-free rights to record, edit, copy, reproduce, publish, distribute, and use all or part of the manuscript for any purpose, in any media now existing or developed in the future, either individually or as part of a collection.
All other associated economic and moral rights as granted by the Intellectual Property Code of the Philippines are maintained by the Authors.