Pure angular momentum generator using a ring resonator

Y. F. Yu, Y. H. Fu, Xuming Zhang, A. Q. Liu, T. Bourouina, T. Mei, Z. X. Shen, D. P. Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


This paper reports a pure angular momentum generator using a ring resonator surrounded by a group of nano-rods. The evanescent waves of the circulating light in the ring are scattered by the nano-rods and generate a rotating electromagnetic field, which has only angular momentum but no linear momentum along the axis of rotation. The angular order is determined by the difference between the order of Whispering Gallery mode and the number of the rods, the rotating frequency is equal to the light frequency divided by the angular order. The maximum amplitude of the rotating electromagnetic fields can be 10 times higher than the amplitude of the input field when there are 36 rods (R rod = 120 nm, nr = 1.6). The pure angular momentum generator provides a new platform for trapping and rotation of small particles.
Original languageEnglish
Pages (from-to)21651-21662
Number of pages12
JournalOptics Express
Issue number21
Publication statusPublished - 11 Oct 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Pure angular momentum generator using a ring resonator'. Together they form a unique fingerprint.

Cite this