Recently the spectacular result was derived quantum mechanically that the total angular momentum of photons in light beams with finite lateral extensions can have half-integer quantum numbers. In a circularly polarized Gauss light beam it is half of the spin angular momentum which it would have in a respective infinitely extended wave. In another paper it was shown by a classical calculation that the magnetic moment induced by such a beam in a metal is a factor of two smaller than the one induced by a respective infinitely extended wave. Since the system's angular momentum is proportional to its magnetic moment it could be assumed that the classical result for the magnetic moment reflects the transfer of the total angular momenta of the beam photons to the metal. Here we show that there is no hint that this is indeed the case.
Published in | American Journal of Modern Physics (Volume 6, Issue 5) |
DOI | 10.11648/j.ajmp.20170605.12 |
Page(s) | 88-90 |
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
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Copyright © The Author(s), 2024. Published by Science Publishing Group |
Light Beams with Finite Lateral Extensions, Total Angular Momentum of Photons, Induced Magnetic Moment in Metal
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APA Style
Manfred Fähnle. (2017). Comment on Half-Integer Quantum Numbers for the Total Angular Momentum of Photons in Light Beams with Finite Lateral Extensions. American Journal of Modern Physics, 6(5), 88-90. https://doi.org/10.11648/j.ajmp.20170605.12
ACS Style
Manfred Fähnle. Comment on Half-Integer Quantum Numbers for the Total Angular Momentum of Photons in Light Beams with Finite Lateral Extensions. Am. J. Mod. Phys. 2017, 6(5), 88-90. doi: 10.11648/j.ajmp.20170605.12
AMA Style
Manfred Fähnle. Comment on Half-Integer Quantum Numbers for the Total Angular Momentum of Photons in Light Beams with Finite Lateral Extensions. Am J Mod Phys. 2017;6(5):88-90. doi: 10.11648/j.ajmp.20170605.12
@article{10.11648/j.ajmp.20170605.12, author = {Manfred Fähnle}, title = {Comment on Half-Integer Quantum Numbers for the Total Angular Momentum of Photons in Light Beams with Finite Lateral Extensions}, journal = {American Journal of Modern Physics}, volume = {6}, number = {5}, pages = {88-90}, doi = {10.11648/j.ajmp.20170605.12}, url = {https://doi.org/10.11648/j.ajmp.20170605.12}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmp.20170605.12}, abstract = {Recently the spectacular result was derived quantum mechanically that the total angular momentum of photons in light beams with finite lateral extensions can have half-integer quantum numbers. In a circularly polarized Gauss light beam it is half of the spin angular momentum which it would have in a respective infinitely extended wave. In another paper it was shown by a classical calculation that the magnetic moment induced by such a beam in a metal is a factor of two smaller than the one induced by a respective infinitely extended wave. Since the system's angular momentum is proportional to its magnetic moment it could be assumed that the classical result for the magnetic moment reflects the transfer of the total angular momenta of the beam photons to the metal. Here we show that there is no hint that this is indeed the case.}, year = {2017} }
TY - JOUR T1 - Comment on Half-Integer Quantum Numbers for the Total Angular Momentum of Photons in Light Beams with Finite Lateral Extensions AU - Manfred Fähnle Y1 - 2017/08/15 PY - 2017 N1 - https://doi.org/10.11648/j.ajmp.20170605.12 DO - 10.11648/j.ajmp.20170605.12 T2 - American Journal of Modern Physics JF - American Journal of Modern Physics JO - American Journal of Modern Physics SP - 88 EP - 90 PB - Science Publishing Group SN - 2326-8891 UR - https://doi.org/10.11648/j.ajmp.20170605.12 AB - Recently the spectacular result was derived quantum mechanically that the total angular momentum of photons in light beams with finite lateral extensions can have half-integer quantum numbers. In a circularly polarized Gauss light beam it is half of the spin angular momentum which it would have in a respective infinitely extended wave. In another paper it was shown by a classical calculation that the magnetic moment induced by such a beam in a metal is a factor of two smaller than the one induced by a respective infinitely extended wave. Since the system's angular momentum is proportional to its magnetic moment it could be assumed that the classical result for the magnetic moment reflects the transfer of the total angular momenta of the beam photons to the metal. Here we show that there is no hint that this is indeed the case. VL - 6 IS - 5 ER -